Abstract

We report an ultrasmall microfiber-probe-based reflective interferometer for highly sensitive liquid refractive index measurement. It has a 3.5μm micronotch cavity fabricated by focused ion beam micromachining. A sensitivity of 110nm/RIU (refractive index unit) in liquid is achieved with over 20dB extinction ratio. Theoretical analysis shows this kind of device is a hybrid of Fabry–Perot and modal interferometers. In comparison with normal fiber interferometers, this probe sensor is very compact, stable, and cheap, offering great potentials for detecting inside sub-wavelength bubbles, droplets, or biocells.

© 2010 Optical Society of America

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2010 (1)

2009 (2)

J. Villatoro, V. Finazzi, G. Coviello, and V. Pruneri, Opt. Lett. 34, 2441 (2009).
[CrossRef] [PubMed]

K. M. Zhou, D. J. Webb, C. B. Mou, M. Farries, N. Hayes, and I. Bennion, IEEE Photon. Technol. Lett. 21, 1653(2009).
[CrossRef]

2008 (2)

2007 (2)

2004 (1)

1996 (1)

V. Bhatia, K. A. Murphy, R. O. Claus, M. E. Jones, J. L. Grace, T. A. Tran, and J. A. Greene, Measure. Sci. Technol. 7, 58 (1996).
[CrossRef]

1993 (1)

1991 (1)

J. D. Love, W. M. Henry, W. J. Stewart, R. J. Black, S. Lacroix, and F. Gonthier, IEE Proc. J 138, 343 (1991).

Bennion, I.

K. M. Zhou, D. J. Webb, C. B. Mou, M. Farries, N. Hayes, and I. Bennion, IEEE Photon. Technol. Lett. 21, 1653(2009).
[CrossRef]

Berkoff, T. A.

Bhatia, V.

V. Bhatia, K. A. Murphy, R. O. Claus, M. E. Jones, J. L. Grace, T. A. Tran, and J. A. Greene, Measure. Sci. Technol. 7, 58 (1996).
[CrossRef]

Black, R. J.

J. D. Love, W. M. Henry, W. J. Stewart, R. J. Black, S. Lacroix, and F. Gonthier, IEE Proc. J 138, 343 (1991).

Brambilla, G.

Brennan, D. D.

Cheng, G.-H.

Choi, H. Y.

Claus, R. O.

V. Bhatia, K. A. Murphy, R. O. Claus, M. E. Jones, J. L. Grace, T. A. Tran, and J. A. Greene, Measure. Sci. Technol. 7, 58 (1996).
[CrossRef]

Coviello, G.

Deng, M.

Duan, D.-W.

Farries, M.

K. M. Zhou, D. J. Webb, C. B. Mou, M. Farries, N. Hayes, and I. Bennion, IEEE Photon. Technol. Lett. 21, 1653(2009).
[CrossRef]

Finazzi, V.

Friebele, E. J.

Gonthier, F.

J. D. Love, W. M. Henry, W. J. Stewart, R. J. Black, S. Lacroix, and F. Gonthier, IEE Proc. J 138, 343 (1991).

Grace, J. L.

V. Bhatia, K. A. Murphy, R. O. Claus, M. E. Jones, J. L. Grace, T. A. Tran, and J. A. Greene, Measure. Sci. Technol. 7, 58 (1996).
[CrossRef]

Greene, J. A.

V. Bhatia, K. A. Murphy, R. O. Claus, M. E. Jones, J. L. Grace, T. A. Tran, and J. A. Greene, Measure. Sci. Technol. 7, 58 (1996).
[CrossRef]

Han, Y.

Hayes, N.

K. M. Zhou, D. J. Webb, C. B. Mou, M. Farries, N. Hayes, and I. Bennion, IEEE Photon. Technol. Lett. 21, 1653(2009).
[CrossRef]

Henry, W. M.

J. D. Love, W. M. Henry, W. J. Stewart, R. J. Black, S. Lacroix, and F. Gonthier, IEE Proc. J 138, 343 (1991).

Jones, M. E.

V. Bhatia, K. A. Murphy, R. O. Claus, M. E. Jones, J. L. Grace, T. A. Tran, and J. A. Greene, Measure. Sci. Technol. 7, 58 (1996).
[CrossRef]

Jung, Y.

Kersey, A. D.

Lacroix, S.

J. D. Love, W. M. Henry, W. J. Stewart, R. J. Black, S. Lacroix, and F. Gonthier, IEE Proc. J 138, 343 (1991).

Lee, B. H.

Li, Y.

Love, J. D.

J. D. Love, W. M. Henry, W. J. Stewart, R. J. Black, S. Lacroix, and F. Gonthier, IEE Proc. J 138, 343 (1991).

Mou, C. B.

K. M. Zhou, D. J. Webb, C. B. Mou, M. Farries, N. Hayes, and I. Bennion, IEEE Photon. Technol. Lett. 21, 1653(2009).
[CrossRef]

Mudhana, G.

Murphy, K. A.

V. Bhatia, K. A. Murphy, R. O. Claus, M. E. Jones, J. L. Grace, T. A. Tran, and J. A. Greene, Measure. Sci. Technol. 7, 58 (1996).
[CrossRef]

Paek, U.-C.

Park, K. S.

Pruneri, V.

Putman, M. A.

Rao, Y.-J.

Richardson, D. J.

Sirkis, J. S.

Stewart, W. J.

J. D. Love, W. M. Henry, W. J. Stewart, R. J. Black, S. Lacroix, and F. Gonthier, IEE Proc. J 138, 343 (1991).

Tran, T. A.

V. Bhatia, K. A. Murphy, R. O. Claus, M. E. Jones, J. L. Grace, T. A. Tran, and J. A. Greene, Measure. Sci. Technol. 7, 58 (1996).
[CrossRef]

Tsai, H.-L.

Villatoro, J.

Webb, D. J.

K. M. Zhou, D. J. Webb, C. B. Mou, M. Farries, N. Hayes, and I. Bennion, IEEE Photon. Technol. Lett. 21, 1653(2009).
[CrossRef]

Wei, T.

Xiao, H.

Xu, F.

G. Brambilla and F. Xu, Electron. Lett. 43, 204 (2007).
[CrossRef]

Yang, X.-C.

Zhou, K. M.

K. M. Zhou, D. J. Webb, C. B. Mou, M. Farries, N. Hayes, and I. Bennion, IEEE Photon. Technol. Lett. 21, 1653(2009).
[CrossRef]

Zhu, T.

Electron. Lett. (1)

G. Brambilla and F. Xu, Electron. Lett. 43, 204 (2007).
[CrossRef]

IEE Proc. J (1)

J. D. Love, W. M. Henry, W. J. Stewart, R. J. Black, S. Lacroix, and F. Gonthier, IEE Proc. J 138, 343 (1991).

IEEE Photon. Technol. Lett. (1)

K. M. Zhou, D. J. Webb, C. B. Mou, M. Farries, N. Hayes, and I. Bennion, IEEE Photon. Technol. Lett. 21, 1653(2009).
[CrossRef]

Measure. Sci. Technol. (1)

V. Bhatia, K. A. Murphy, R. O. Claus, M. E. Jones, J. L. Grace, T. A. Tran, and J. A. Greene, Measure. Sci. Technol. 7, 58 (1996).
[CrossRef]

Opt. Express (5)

Opt. Lett. (2)

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Figures (4)

Fig. 1
Fig. 1

Taper profile measured (filled circles) under an optical microscope. The solid curve is a fitting curve.

Fig. 2
Fig. 2

SEM image of the micronotch cavity from the side.

Fig. 3
Fig. 3

(a) Experimental setup of an MPRI sensor. (b) Structure of an MPRI: I L and I R are the reflections at end face L and end face R, respectively, and L c is the length of the cavity.

Fig. 4
Fig. 4

(a) Interference spectra of the MPRI device in air (solid curve), acetone (dashed curve), and isopropanol (dotted curve) at room temperature ( 25 ° C ). (b) The shifted spectral wavelength as a function of the liquid mixture refractive index. The asterisks represent the measured results while the solid curve is the fitting results.

Equations (1)

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δ m , n = p δ 1 + q δ 2 = 2 p n c L c ( 2 π / λ ) + ( 2 q π / λ ) ( n 2 ( r ) n 1 ( r ) ) d z ( r ) ,

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