Abstract

We describe a simple and efficient means of using a white LED source to illuminate an optically levitated aerosol droplet to enable study of broadband Mie scattering. The backscattered resonances are imaged through a spectrograph and CCD which show high resolution Mie scattering intensity distributions across a spectral range of 480 to 700 nm. The wide spectral range allows assignment of resonance mode numbers and mode orders using conventional Mie theory calculations. Accurate droplet sizing, within ±2 nm, is possible for water–based droplets with radii between 2 µm and 8 µm. We additionally demonstrate that the refractive index dispersion can be determined from a single refractive index value at known wavelength. Finally, morphological droplet dynamics are presented showing non-linear droplet evaporation behaviour at a temporal resolution of 100 milliseconds.

© 2008 Optical Society of America

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2008 (6)

D. McGloin, D. R. Burnham, M. D. Summers, D. Rudd, N. Dewar, and S. Anand, "Optical manipulation of airborne particles: techniques and applications," Faraday Discuss. 137, 335-350 (2008).
[CrossRef] [PubMed]

K.  Dholakia, P.  Reece, and M.  Gu, "Optical micromanipulation," Chem. Soc. Rev.  37, 42-55 (2008).
[CrossRef] [PubMed]

L. Mitchem and J. P. Reid "Optical manipulation and characterisation of aerosol particles using a single-beam gradient force optical trap," Chem. Soc. Rev. 37, 756-769 (2008).
[CrossRef] [PubMed]

M. Guillon, and B. Stout "Optical trapping and binding in air: Imaging and spectroscopic analysis," Phys. Rev. A 77, 023806 (2008).
[CrossRef]

J. R. Butler, L. Mitchem, K. L. Hanford, L. Treuel and J. P. Reid "In situ comparative measurements of the properties of aerosol droplets of different chemical composition," Faraday Discuss. 137, 351-366 (2008).
[CrossRef] [PubMed]

M. Guillon, K. Dholakia and D. McGloin "Optical trapping and spectral analysis of aerosols with a supercontinuum laser source," Opt. Express 16, 7655-7664 (2008).
[CrossRef] [PubMed]

2007 (3)

A. A. Zemlyanov and Y. E. Geints, "Aerosol scattering of supercontinuum radiation formed upon femtosecond laser pulse filamentation in the atmosphere," Opt. Commun. 270,47-50 (2007).
[CrossRef]

K. J. Knox, J. P. Reid, K. L. Hanford, A. J. Hudson and L. Mitchem, "Direct measurements of the axial displacement and evolving size of optically trapped aerosol droplets," J. Opt. A: Pure Appl. Opt. 9, S180-S188 (2007).
[CrossRef]

S. Rudic, R. E. H. Miles, A. J. Orr-Ewing, and J. P. Reid "Optical properties of micrometer size water droplets studied by cavity ringdown spectroscopy," Appl. Opt. 46, 6142-6150 (2007).
[CrossRef] [PubMed]

2006 (4)

A. A. Zardini, U. K. Krieger, and C. Marcolli "White light Mie resonance spectroscopy used to measure very low vapor pressures of substances in aqueous solution aerosol particles," Opt. Express 14, 6951-6962 (2006).
[CrossRef] [PubMed]

L. Mitchem, J. Buajarern, R. J. Hopkins, A. D. Ward, R. J. J. Gilham, R. L. Johnston, and J. P. Reid "Spectroscopy of Growing and Evaporating Water Droplets: Exploring the Variation in equilibrium Droplet Size with Relative Humidity," J. Phys. Chem. A 110, 8116-8125 (2006).
[CrossRef] [PubMed]

A. D. Ward, M. G. Berry, C. D. Mellor and C. D. Bain "Optical sculpture: controlled deformation of emulsion droplets with ultralow interfacial tensions using optical tweezers" Chem. Commun.4515-4517 (2006).
[CrossRef]

D.  McGloin, "Optical Tweezers: 20 years on," Philos. Trans. R. Soc. A  364, 3521-3527 (2006).
[CrossRef]

2005 (2)

C. M. Creely, G. P. Singh, and D. Petrov, "Dual wavelength optical tweezers for confocal Raman spectroscopy," Opt. Commun. 245, 465-470 (2005).
[CrossRef]

P. Li, K. Shi, and Z. Liu "Manipulation and spectroscopy of a single particle by use of white-light optical tweezers," Opt. Lett. 30, 156-158 (2005).
[CrossRef] [PubMed]

2004 (2)

M. D. King, K. C. Thompson, and A. D. Ward, "Laser Tweezers Raman Study of Optically Trapped Aerosol Droplets of Seawater and Oleic Acid Reacting with Ozone: Implications for Cloud-Droplet Properties," J. Am. Chem. Soc. 126, 16710-6711 (2004).
[CrossRef]

R. Symes, R. M. Sayer, and J. P. Reid "Cavity enhanced droplet spectroscopy: Principles, perspectives and prospects," Phys. Chem. Chem. Phys. 6, 474-487 (2004).
[CrossRef]

2003 (3)

2001 (1)

1997 (1)

1994 (1)

1993 (1)

1991 (1)

1990 (2)

P. Chylek "Resonance structure of Mie scattering: distance between resonances," J. Opt. Soc. Am. A 7, 1609-1613 (1990).

R. C. Millard and G. Seaver, "An index of refraction algorithm for seawater over temperature, pressure, salinity, density, and wavelength," Deep-Sea Res. 37, 1909-1926 (1990).
[CrossRef]

1988 (1)

1986 (1)

1985 (3)

1983 (1)

1981 (1)

1980 (1)

R. E.  Benner, P. W.  Barber, J. F.  Owen, and R. K.  Chang, "Observation of structure resonances in the fluorescence spectra from microspheres," Phys. Rev. Lett.  44, 475-478 (1980).
[CrossRef]

1978 (1)

P. Chýlek, J. T. Kiehl, and M. K. W. Ko "Optical levitation and partial-wave resonances," Phys. Rev. A 18, 2229-2233 (1978).
[CrossRef]

Anand, S.

D. McGloin, D. R. Burnham, M. D. Summers, D. Rudd, N. Dewar, and S. Anand, "Optical manipulation of airborne particles: techniques and applications," Faraday Discuss. 137, 335-350 (2008).
[CrossRef] [PubMed]

Ashkin, A.

Axner, O.

Bain, C. D.

A. D. Ward, M. G. Berry, C. D. Mellor and C. D. Bain "Optical sculpture: controlled deformation of emulsion droplets with ultralow interfacial tensions using optical tweezers" Chem. Commun.4515-4517 (2006).
[CrossRef]

Barber, P. W.

R. E.  Benner, P. W.  Barber, J. F.  Owen, and R. K.  Chang, "Observation of structure resonances in the fluorescence spectra from microspheres," Phys. Rev. Lett.  44, 475-478 (1980).
[CrossRef]

Benner, R. E.

S. C. Hill, C. K. Rushforth, R. E. Benner, and P. R. Conwell "Sizing dielectric spheres and cylinders by aligning measured and computed resonance locations algorithm for multiple orders" Appl. Opt. 24, 2380-2390 (1985).
[CrossRef] [PubMed]

R. E.  Benner, P. W.  Barber, J. F.  Owen, and R. K.  Chang, "Observation of structure resonances in the fluorescence spectra from microspheres," Phys. Rev. Lett.  44, 475-478 (1980).
[CrossRef]

Berry, M. G.

A. D. Ward, M. G. Berry, C. D. Mellor and C. D. Bain "Optical sculpture: controlled deformation of emulsion droplets with ultralow interfacial tensions using optical tweezers" Chem. Commun.4515-4517 (2006).
[CrossRef]

Bjorkholm, J. E.

Buajarern, J.

L. Mitchem, J. Buajarern, R. J. Hopkins, A. D. Ward, R. J. J. Gilham, R. L. Johnston, and J. P. Reid "Spectroscopy of Growing and Evaporating Water Droplets: Exploring the Variation in equilibrium Droplet Size with Relative Humidity," J. Phys. Chem. A 110, 8116-8125 (2006).
[CrossRef] [PubMed]

Burnham, D. R.

D. McGloin, D. R. Burnham, M. D. Summers, D. Rudd, N. Dewar, and S. Anand, "Optical manipulation of airborne particles: techniques and applications," Faraday Discuss. 137, 335-350 (2008).
[CrossRef] [PubMed]

Butler, J. R.

J. R. Butler, L. Mitchem, K. L. Hanford, L. Treuel and J. P. Reid "In situ comparative measurements of the properties of aerosol droplets of different chemical composition," Faraday Discuss. 137, 351-366 (2008).
[CrossRef] [PubMed]

Campillo, A. J.

Chang, R. K.

Chu, S.

Chylek, P.

Chýlek, P.

P. Chýlek, J. T. Kiehl, and M. K. W. Ko "Optical levitation and partial-wave resonances," Phys. Rev. A 18, 2229-2233 (1978).
[CrossRef]

Conwell, P. R.

Creely, C. M.

C. M. Creely, G. P. Singh, and D. Petrov, "Dual wavelength optical tweezers for confocal Raman spectroscopy," Opt. Commun. 245, 465-470 (2005).
[CrossRef]

Das, B.

Dewar, N.

D. McGloin, D. R. Burnham, M. D. Summers, D. Rudd, N. Dewar, and S. Anand, "Optical manipulation of airborne particles: techniques and applications," Faraday Discuss. 137, 335-350 (2008).
[CrossRef] [PubMed]

Dholakia, K.

Dziedzic, J. M.

Eversole, J. D.

Fallman, E.

Geints, Y. E.

A. A. Zemlyanov and Y. E. Geints, "Aerosol scattering of supercontinuum radiation formed upon femtosecond laser pulse filamentation in the atmosphere," Opt. Commun. 270,47-50 (2007).
[CrossRef]

Gilham, R. J. J.

L. Mitchem, J. Buajarern, R. J. Hopkins, A. D. Ward, R. J. J. Gilham, R. L. Johnston, and J. P. Reid "Spectroscopy of Growing and Evaporating Water Droplets: Exploring the Variation in equilibrium Droplet Size with Relative Humidity," J. Phys. Chem. A 110, 8116-8125 (2006).
[CrossRef] [PubMed]

Gu, M.

K.  Dholakia, P.  Reece, and M.  Gu, "Optical micromanipulation," Chem. Soc. Rev.  37, 42-55 (2008).
[CrossRef] [PubMed]

Guillon, M.

M. Guillon, K. Dholakia and D. McGloin "Optical trapping and spectral analysis of aerosols with a supercontinuum laser source," Opt. Express 16, 7655-7664 (2008).
[CrossRef] [PubMed]

M. Guillon, and B. Stout "Optical trapping and binding in air: Imaging and spectroscopic analysis," Phys. Rev. A 77, 023806 (2008).
[CrossRef]

Hanford, K. L.

J. R. Butler, L. Mitchem, K. L. Hanford, L. Treuel and J. P. Reid "In situ comparative measurements of the properties of aerosol droplets of different chemical composition," Faraday Discuss. 137, 351-366 (2008).
[CrossRef] [PubMed]

K. J. Knox, J. P. Reid, K. L. Hanford, A. J. Hudson and L. Mitchem, "Direct measurements of the axial displacement and evolving size of optically trapped aerosol droplets," J. Opt. A: Pure Appl. Opt. 9, S180-S188 (2007).
[CrossRef]

Hill, S. C.

Hopkins, R. J.

L. Mitchem, J. Buajarern, R. J. Hopkins, A. D. Ward, R. J. J. Gilham, R. L. Johnston, and J. P. Reid "Spectroscopy of Growing and Evaporating Water Droplets: Exploring the Variation in equilibrium Droplet Size with Relative Humidity," J. Phys. Chem. A 110, 8116-8125 (2006).
[CrossRef] [PubMed]

Huckaby, J. L.

Hudson, A. J.

K. J. Knox, J. P. Reid, K. L. Hanford, A. J. Hudson and L. Mitchem, "Direct measurements of the axial displacement and evolving size of optically trapped aerosol droplets," J. Opt. A: Pure Appl. Opt. 9, S180-S188 (2007).
[CrossRef]

Huston, A. L.

Ilchenko, V. S.

A. B. Matsko, A. A. Savchenkov, R. J. Letargat, V. S. Ilchenko and L. Maleki"On cavity modification of stimulated Raman scattering," J. Opt.B Quantum Semiclassical Opt. 5,272-278 (2003).
[CrossRef]

Johnston, R. L.

L. Mitchem, J. Buajarern, R. J. Hopkins, A. D. Ward, R. J. J. Gilham, R. L. Johnston, and J. P. Reid "Spectroscopy of Growing and Evaporating Water Droplets: Exploring the Variation in equilibrium Droplet Size with Relative Humidity," J. Phys. Chem. A 110, 8116-8125 (2006).
[CrossRef] [PubMed]

Kiefer, W.

Kiehl, J. T.

P. Chýlek, J. T. Kiehl, and M. K. W. Ko "Optical levitation and partial-wave resonances," Phys. Rev. A 18, 2229-2233 (1978).
[CrossRef]

King, M. D.

M. D. King, K. C. Thompson, and A. D. Ward, "Laser Tweezers Raman Study of Optically Trapped Aerosol Droplets of Seawater and Oleic Acid Reacting with Ozone: Implications for Cloud-Droplet Properties," J. Am. Chem. Soc. 126, 16710-6711 (2004).
[CrossRef]

Knox, K. J.

K. J. Knox, J. P. Reid, K. L. Hanford, A. J. Hudson and L. Mitchem, "Direct measurements of the axial displacement and evolving size of optically trapped aerosol droplets," J. Opt. A: Pure Appl. Opt. 9, S180-S188 (2007).
[CrossRef]

Ko, M. K. W.

P. Chýlek, J. T. Kiehl, and M. K. W. Ko "Optical levitation and partial-wave resonances," Phys. Rev. A 18, 2229-2233 (1978).
[CrossRef]

Krieger, U. K.

Lacis, A. A.

Laven, P.

Leach, D. H.

Letargat, R. J.

A. B. Matsko, A. A. Savchenkov, R. J. Letargat, V. S. Ilchenko and L. Maleki"On cavity modification of stimulated Raman scattering," J. Opt.B Quantum Semiclassical Opt. 5,272-278 (2003).
[CrossRef]

Leung, P. T.

Li, P.

Lin, H.-B.

Liu, S. Y.

Liu, Z.

Maleki, L.

A. B. Matsko, A. A. Savchenkov, R. J. Letargat, V. S. Ilchenko and L. Maleki"On cavity modification of stimulated Raman scattering," J. Opt.B Quantum Semiclassical Opt. 5,272-278 (2003).
[CrossRef]

Marcolli, C.

Matsko, A. B.

A. B. Matsko, A. A. Savchenkov, R. J. Letargat, V. S. Ilchenko and L. Maleki"On cavity modification of stimulated Raman scattering," J. Opt.B Quantum Semiclassical Opt. 5,272-278 (2003).
[CrossRef]

McGloin, D.

D. McGloin, D. R. Burnham, M. D. Summers, D. Rudd, N. Dewar, and S. Anand, "Optical manipulation of airborne particles: techniques and applications," Faraday Discuss. 137, 335-350 (2008).
[CrossRef] [PubMed]

M. Guillon, K. Dholakia and D. McGloin "Optical trapping and spectral analysis of aerosols with a supercontinuum laser source," Opt. Express 16, 7655-7664 (2008).
[CrossRef] [PubMed]

D.  McGloin, "Optical Tweezers: 20 years on," Philos. Trans. R. Soc. A  364, 3521-3527 (2006).
[CrossRef]

Mellor, C. D.

A. D. Ward, M. G. Berry, C. D. Mellor and C. D. Bain "Optical sculpture: controlled deformation of emulsion droplets with ultralow interfacial tensions using optical tweezers" Chem. Commun.4515-4517 (2006).
[CrossRef]

Miles, R. E. H.

Millard, R. C.

R. C. Millard and G. Seaver, "An index of refraction algorithm for seawater over temperature, pressure, salinity, density, and wavelength," Deep-Sea Res. 37, 1909-1926 (1990).
[CrossRef]

Mishchenko, I.

Mitchem, L.

L. Mitchem and J. P. Reid "Optical manipulation and characterisation of aerosol particles using a single-beam gradient force optical trap," Chem. Soc. Rev. 37, 756-769 (2008).
[CrossRef] [PubMed]

J. R. Butler, L. Mitchem, K. L. Hanford, L. Treuel and J. P. Reid "In situ comparative measurements of the properties of aerosol droplets of different chemical composition," Faraday Discuss. 137, 351-366 (2008).
[CrossRef] [PubMed]

K. J. Knox, J. P. Reid, K. L. Hanford, A. J. Hudson and L. Mitchem, "Direct measurements of the axial displacement and evolving size of optically trapped aerosol droplets," J. Opt. A: Pure Appl. Opt. 9, S180-S188 (2007).
[CrossRef]

L. Mitchem, J. Buajarern, R. J. Hopkins, A. D. Ward, R. J. J. Gilham, R. L. Johnston, and J. P. Reid "Spectroscopy of Growing and Evaporating Water Droplets: Exploring the Variation in equilibrium Droplet Size with Relative Humidity," J. Phys. Chem. A 110, 8116-8125 (2006).
[CrossRef] [PubMed]

Orr-Ewing, A. J.

Owen, J. F.

R. E.  Benner, P. W.  Barber, J. F.  Owen, and R. K.  Chang, "Observation of structure resonances in the fluorescence spectra from microspheres," Phys. Rev. Lett.  44, 475-478 (1980).
[CrossRef]

Pastel, R.

Petrov, D.

C. M. Creely, G. P. Singh, and D. Petrov, "Dual wavelength optical tweezers for confocal Raman spectroscopy," Opt. Commun. 245, 465-470 (2005).
[CrossRef]

Qian, S.

Ramaswamy, V.

Ray, A. K.

Reece, P.

K.  Dholakia, P.  Reece, and M.  Gu, "Optical micromanipulation," Chem. Soc. Rev.  37, 42-55 (2008).
[CrossRef] [PubMed]

Reid, J. P.

L. Mitchem and J. P. Reid "Optical manipulation and characterisation of aerosol particles using a single-beam gradient force optical trap," Chem. Soc. Rev. 37, 756-769 (2008).
[CrossRef] [PubMed]

J. R. Butler, L. Mitchem, K. L. Hanford, L. Treuel and J. P. Reid "In situ comparative measurements of the properties of aerosol droplets of different chemical composition," Faraday Discuss. 137, 351-366 (2008).
[CrossRef] [PubMed]

K. J. Knox, J. P. Reid, K. L. Hanford, A. J. Hudson and L. Mitchem, "Direct measurements of the axial displacement and evolving size of optically trapped aerosol droplets," J. Opt. A: Pure Appl. Opt. 9, S180-S188 (2007).
[CrossRef]

S. Rudic, R. E. H. Miles, A. J. Orr-Ewing, and J. P. Reid "Optical properties of micrometer size water droplets studied by cavity ringdown spectroscopy," Appl. Opt. 46, 6142-6150 (2007).
[CrossRef] [PubMed]

L. Mitchem, J. Buajarern, R. J. Hopkins, A. D. Ward, R. J. J. Gilham, R. L. Johnston, and J. P. Reid "Spectroscopy of Growing and Evaporating Water Droplets: Exploring the Variation in equilibrium Droplet Size with Relative Humidity," J. Phys. Chem. A 110, 8116-8125 (2006).
[CrossRef] [PubMed]

R. Symes, R. M. Sayer, and J. P. Reid "Cavity enhanced droplet spectroscopy: Principles, perspectives and prospects," Phys. Chem. Chem. Phys. 6, 474-487 (2004).
[CrossRef]

Rudd, D.

D. McGloin, D. R. Burnham, M. D. Summers, D. Rudd, N. Dewar, and S. Anand, "Optical manipulation of airborne particles: techniques and applications," Faraday Discuss. 137, 335-350 (2008).
[CrossRef] [PubMed]

Rudic, S.

Rushforth, C. K.

Savchenkov, A. A.

A. B. Matsko, A. A. Savchenkov, R. J. Letargat, V. S. Ilchenko and L. Maleki"On cavity modification of stimulated Raman scattering," J. Opt.B Quantum Semiclassical Opt. 5,272-278 (2003).
[CrossRef]

Sayer, R. M.

R. Symes, R. M. Sayer, and J. P. Reid "Cavity enhanced droplet spectroscopy: Principles, perspectives and prospects," Phys. Chem. Chem. Phys. 6, 474-487 (2004).
[CrossRef]

Seaver, G.

R. C. Millard and G. Seaver, "An index of refraction algorithm for seawater over temperature, pressure, salinity, density, and wavelength," Deep-Sea Res. 37, 1909-1926 (1990).
[CrossRef]

Shi, K.

Singh, G. P.

C. M. Creely, G. P. Singh, and D. Petrov, "Dual wavelength optical tweezers for confocal Raman spectroscopy," Opt. Commun. 245, 465-470 (2005).
[CrossRef]

Snow, J. B.

Stout, B.

M. Guillon, and B. Stout "Optical trapping and binding in air: Imaging and spectroscopic analysis," Phys. Rev. A 77, 023806 (2008).
[CrossRef]

Struthers, A.

Summers, M. D.

D. McGloin, D. R. Burnham, M. D. Summers, D. Rudd, N. Dewar, and S. Anand, "Optical manipulation of airborne particles: techniques and applications," Faraday Discuss. 137, 335-350 (2008).
[CrossRef] [PubMed]

Symes, R.

R. Symes, R. M. Sayer, and J. P. Reid "Cavity enhanced droplet spectroscopy: Principles, perspectives and prospects," Phys. Chem. Chem. Phys. 6, 474-487 (2004).
[CrossRef]

Thompson, K. C.

M. D. King, K. C. Thompson, and A. D. Ward, "Laser Tweezers Raman Study of Optically Trapped Aerosol Droplets of Seawater and Oleic Acid Reacting with Ozone: Implications for Cloud-Droplet Properties," J. Am. Chem. Soc. 126, 16710-6711 (2004).
[CrossRef]

Thurn, R.

Treuel, L.

J. R. Butler, L. Mitchem, K. L. Hanford, L. Treuel and J. P. Reid "In situ comparative measurements of the properties of aerosol droplets of different chemical composition," Faraday Discuss. 137, 351-366 (2008).
[CrossRef] [PubMed]

Ward, A. D.

A. D. Ward, M. G. Berry, C. D. Mellor and C. D. Bain "Optical sculpture: controlled deformation of emulsion droplets with ultralow interfacial tensions using optical tweezers" Chem. Commun.4515-4517 (2006).
[CrossRef]

L. Mitchem, J. Buajarern, R. J. Hopkins, A. D. Ward, R. J. J. Gilham, R. L. Johnston, and J. P. Reid "Spectroscopy of Growing and Evaporating Water Droplets: Exploring the Variation in equilibrium Droplet Size with Relative Humidity," J. Phys. Chem. A 110, 8116-8125 (2006).
[CrossRef] [PubMed]

M. D. King, K. C. Thompson, and A. D. Ward, "Laser Tweezers Raman Study of Optically Trapped Aerosol Droplets of Seawater and Oleic Acid Reacting with Ozone: Implications for Cloud-Droplet Properties," J. Am. Chem. Soc. 126, 16710-6711 (2004).
[CrossRef]

Young, K.

Zardini, A. A.

Zemlyanov, A. A.

A. A. Zemlyanov and Y. E. Geints, "Aerosol scattering of supercontinuum radiation formed upon femtosecond laser pulse filamentation in the atmosphere," Opt. Commun. 270,47-50 (2007).
[CrossRef]

Zhang, J. Z.

Appl. Opt. (10)

A. Ashkin and J. M. Dziedzic "Observation of optical resonances of dielectric spheres by light scattering," Appl. Opt. 20, 1803-1814 (1981).
[CrossRef] [PubMed]

R. Thurn and W. Kiefer, "Structural resonances observed in the Raman spectra of optically levitated liquid droplets," Appl. Opt. 24, 1515-1519 (1985).
[CrossRef] [PubMed]

S. C. Hill, C. K. Rushforth, R. E. Benner, and P. R. Conwell "Sizing dielectric spheres and cylinders by aligning measured and computed resonance locations algorithm for multiple orders" Appl. Opt. 24, 2380-2390 (1985).
[CrossRef] [PubMed]

J. L. Huckaby, A. K. Ray and B. Das, "Determination of size, refractive index, and dispersion of single droplets from wavelength-dependent scattering spectra," Appl. Opt. 33, 7112-7125 (1994)
[CrossRef] [PubMed]

E. Fallman and O. Axner "Design for fully steerable dual-trap optical tweezers," Appl. Opt. 36, 2107-2113 (1997),
[CrossRef] [PubMed]

P. Chylek, V. Ramaswamy, A. Ashkin, and J. M. Dziedzic, "Simultaneous determination of refractive index and size of spherical dielectric particles from light scattering data," Appl. Opt. 22, 2302-2307 (1983).
[CrossRef] [PubMed]

R. Pastel and A. Struthers, "Measuring Evaporation Rates of Laser-Trapped Droplets by Use of Fluorescent Morphology-Dependent Resonances," Appl. Opt. 40, 2510-2514 (2001).
[CrossRef]

P. Laven, "Simulation of rainbows, coronas, and glories by use of Mie theory" Appl. Opt. 42, 436-444 (2003).
[CrossRef] [PubMed]

I. Mishchenko and A. A. Lacis, "Morphology-dependent resonances of nearly spherical particles in random orientation," Appl. Opt. 42, 5551-5556 (2003).
[PubMed]

S. Rudic, R. E. H. Miles, A. J. Orr-Ewing, and J. P. Reid "Optical properties of micrometer size water droplets studied by cavity ringdown spectroscopy," Appl. Opt. 46, 6142-6150 (2007).
[CrossRef] [PubMed]

B Quantum Semiclassical Opt. (1)

A. B. Matsko, A. A. Savchenkov, R. J. Letargat, V. S. Ilchenko and L. Maleki"On cavity modification of stimulated Raman scattering," J. Opt.B Quantum Semiclassical Opt. 5,272-278 (2003).
[CrossRef]

Chem. Commun. (1)

A. D. Ward, M. G. Berry, C. D. Mellor and C. D. Bain "Optical sculpture: controlled deformation of emulsion droplets with ultralow interfacial tensions using optical tweezers" Chem. Commun.4515-4517 (2006).
[CrossRef]

Chem. Soc. Rev. (2)

K.  Dholakia, P.  Reece, and M.  Gu, "Optical micromanipulation," Chem. Soc. Rev.  37, 42-55 (2008).
[CrossRef] [PubMed]

L. Mitchem and J. P. Reid "Optical manipulation and characterisation of aerosol particles using a single-beam gradient force optical trap," Chem. Soc. Rev. 37, 756-769 (2008).
[CrossRef] [PubMed]

Deep-Sea Res. (1)

R. C. Millard and G. Seaver, "An index of refraction algorithm for seawater over temperature, pressure, salinity, density, and wavelength," Deep-Sea Res. 37, 1909-1926 (1990).
[CrossRef]

Faraday Discuss. (2)

D. McGloin, D. R. Burnham, M. D. Summers, D. Rudd, N. Dewar, and S. Anand, "Optical manipulation of airborne particles: techniques and applications," Faraday Discuss. 137, 335-350 (2008).
[CrossRef] [PubMed]

J. R. Butler, L. Mitchem, K. L. Hanford, L. Treuel and J. P. Reid "In situ comparative measurements of the properties of aerosol droplets of different chemical composition," Faraday Discuss. 137, 351-366 (2008).
[CrossRef] [PubMed]

J. Am. Chem. Soc. (1)

M. D. King, K. C. Thompson, and A. D. Ward, "Laser Tweezers Raman Study of Optically Trapped Aerosol Droplets of Seawater and Oleic Acid Reacting with Ozone: Implications for Cloud-Droplet Properties," J. Am. Chem. Soc. 126, 16710-6711 (2004).
[CrossRef]

J. Opt. A: Pure Appl. Opt. (1)

K. J. Knox, J. P. Reid, K. L. Hanford, A. J. Hudson and L. Mitchem, "Direct measurements of the axial displacement and evolving size of optically trapped aerosol droplets," J. Opt. A: Pure Appl. Opt. 9, S180-S188 (2007).
[CrossRef]

J. Opt. Soc. Am. A (1)

J. Opt. Soc. Am. B (1)

J. Phys. Chem. A (1)

L. Mitchem, J. Buajarern, R. J. Hopkins, A. D. Ward, R. J. J. Gilham, R. L. Johnston, and J. P. Reid "Spectroscopy of Growing and Evaporating Water Droplets: Exploring the Variation in equilibrium Droplet Size with Relative Humidity," J. Phys. Chem. A 110, 8116-8125 (2006).
[CrossRef] [PubMed]

Opt. Commun. (2)

C. M. Creely, G. P. Singh, and D. Petrov, "Dual wavelength optical tweezers for confocal Raman spectroscopy," Opt. Commun. 245, 465-470 (2005).
[CrossRef]

A. A. Zemlyanov and Y. E. Geints, "Aerosol scattering of supercontinuum radiation formed upon femtosecond laser pulse filamentation in the atmosphere," Opt. Commun. 270,47-50 (2007).
[CrossRef]

Opt. Express (2)

Opt. Lett. (5)

Philos. Trans. R. Soc. A (1)

D.  McGloin, "Optical Tweezers: 20 years on," Philos. Trans. R. Soc. A  364, 3521-3527 (2006).
[CrossRef]

Phys. Chem. Chem. Phys. (1)

R. Symes, R. M. Sayer, and J. P. Reid "Cavity enhanced droplet spectroscopy: Principles, perspectives and prospects," Phys. Chem. Chem. Phys. 6, 474-487 (2004).
[CrossRef]

Phys. Rev. A (2)

P. Chýlek, J. T. Kiehl, and M. K. W. Ko "Optical levitation and partial-wave resonances," Phys. Rev. A 18, 2229-2233 (1978).
[CrossRef]

M. Guillon, and B. Stout "Optical trapping and binding in air: Imaging and spectroscopic analysis," Phys. Rev. A 77, 023806 (2008).
[CrossRef]

Phys. Rev. Lett. (1)

R. E.  Benner, P. W.  Barber, J. F.  Owen, and R. K.  Chang, "Observation of structure resonances in the fluorescence spectra from microspheres," Phys. Rev. Lett.  44, 475-478 (1980).
[CrossRef]

Other (5)

J. H. Seinfeld and S. N. Pandis, Atmospheric Chemistry and Physics: From Air Pollution to Climate Change (New York, Wiley, 1998).

R. K. Chang and A. J. Campillo, Optical Processes in Microcavities (Wiley Scientific, 1996).
[CrossRef]

C. F. Bohren and D. R. Huffman, Absorption and scattering of light by small particles, (Wiley Scientific, 1998).
[CrossRef]

A MATLAB program is employed using the algorithm described by Bohren and Huffman.

D. R. Lide, ed., CRC Handbook of Chemistry and Physics 88th Edition, (Boca Raton, FL, Taylor and Francis, 2007).

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Figures (10)

Fig. 1.
Fig. 1.

A schematic diagram of the experimental setup

Fig. 2.
Fig. 2.

(a). The red curve is the raw backscattered spectrum obtained for a droplet of 5.01 microns in radius. The blue curve shows the white light background. Using background division, spectrum (b) is obtained. The peak at 546 nm is an instrument defect.

Fig. 3.
Fig. 3.

(a). Experimental data showing normalized backscattered spectrum of seven combined acquisitions using a 1200 g/mm grating. (b) Theoretical scattered spectrum calculated based on Mie theory for 180° backscattered light. (c) Theoretical spectrum calculated by integration over a solid acceptance angle from 120° to 180°. Calculated TE modes (coefficient b) and TM modes (coefficient a) are labeled in Fig. 3(a) and (b) respectively. First order WGMs are shown in blue and second order WGMs are labeled in red. Due to space limit, dotted lines are only draw for visualization of the alignment of the TE modes.

Fig. 4.
Fig. 4.

Images of a droplet from the microscope with (a) the white light from LED only and (b) with microscope brightfield illumination only.

Fig. 5.
Fig. 5.

Dispersion relation obtained from matching of the Mie resonance peaks and calculated based on the algorithm reported by Millard et al.

Fig. 6.
Fig. 6.

Temporal evolution of a Nd:YAG laser trapped aerosol droplet with a=1.590 µm

Fig. 7.
Fig. 7.

Temporal evolution of an argon ion laser trapped aerosol droplet showing an overall blue shift of the scattered spectrum. The constant feature at 546 nm is due to an instrument defect.

Fig. 8.
Fig. 8.

A magnification of the transient spectral shifts between t=45 s and 75 s in Fig. 6 showing multiple transition stages

Fig. 9.
Fig. 9.

The spectral evolution of a single peak (top) and its negative derivative (bottom), corresponding to the rate of droplet size reduction, during the fast transition in Fig. 7. The arrows indicate the times where the droplet appears to experience a discrete heating event.

Fig. 10.
Fig. 10.

Theoretical spectrum showing Mie resonance modes in the proximity of the 514.5 nm trapping laser. As droplet size decreases the resonances will shift to lower wavelength across the laser line.

Equations (8)

Equations on this page are rendered with MathJax. Learn more.

a n ( x , m ) = m ψ n ( m x ) ψ n ' ( x ) ψ n ( x ) ψ n ' ( m x ) m ψ n ( m x ) ξ n ' ( x ) ξ n ( x ) ψ n ' ( m x )
b n ( x , m ) = ψ n ( m x ) ψ n ' ( x ) m ψ n ( x ) ψ n ' ( m x ) ψ n ( m x ) ξ n ' ( x ) m ξ n ( x ) ψ n ' ( m x )
A n ( x , m ) = ψ n ( x ) ψ n ' ( m x ) m ψ n ( m x ) ψ n ' ( x )
B n ( x , m ) = m ψ n ( x ) ψ n ' ( m x ) ψ n ( m x ) ψ n ' ( x )
C n ( x , m ) = ξ n ( x ) ψ n ' ( m x ) m ψ n ( m x ) ξ n ' ( x )
D n ( x , m ) = m ξ n ( x ) ψ n ' ( m x ) ψ n ( m x ) ξ n ' ( x )
Δ x = tan 1 ( m 2 1 ) 1 2 ( m 2 1 ) 1 2
a = Δ x 2 π ( λ n l λ n 1 l λ n l λ n 1 l )

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