Abstract

We demonstrate a terahertz (THz) directional coupler for future THz applications including THz power dividers, THz communications, and THz fiber-endoscopes. By using subwavelength polyethylene fibers, we successfully established a single-mode fiber-based THz directional coupler. Unlike traditional directional couplers, the demonstrated subwavelength directional fiber coupler shows less dependency on the overlapped length of two fibers and the delivered THz frequency in our interested minimal-attenuation wavelength regime. By tuning the geometry, we also show the feasibility to control the coupling ratio.

© 2009 IEEE

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2008 (2)

P. J. Chiang, C. L. Wu, C. H. Teng, C. S. Yang, H. C. Chang, "Full-vectorial optical waveguide mode solvers using multidomain pseudospectral frequency-domain (PSFD) formulations," IEEE J. Quant. Electron. 44, 56-66 (2008).

J.-Y. Lu, C.-C. Kuo, C.-M. Chiu, H.-W. Chen, Y.-J. Hwang, C.-L. Pan, C.-K. Sun, "THz interferomertric imaging using subwavelength plastic fiber based THz endoscope," Opt. Express 16, 2494-2501 (2008).

2007 (4)

P. J. Chiang, C. P. Yu, H. C. Chang, "Analysis of two-dimensional photonic crystals using a multidomain pseudospectral method," Phys. Rev. E 75, 026703 (2007).

M. Skorobogatiy, A. Dupuis, "Ferroelectric all-polymer hollow Bragg fibers for terahertz guidance," Appl. Phys. Lett. 90, 113514 (2007).

H.-W. Chen, Y.-T. Li, J.-L. Kuo, J.-Y. Lu, L.-J. Chen, C.-K. Sun, "Investigation on spectral loss characteristics of subwavelength THz fibers," Opt. Lett. 32, 1017-1019 (2007).

R. I. Hunter, D. A. Robertson, P. Goy, G. M. Smith, "Design of high-performance millimeter wave and sub-millimeter wave quasi-optical isolators and circulators," IEEE Trans. Microw. Theory Tech. 55, 890-898 (2007).

2006 (2)

2005 (2)

K. Wang, D. M. Mittleman, "Guided propagation of terahertz pulses on metal wires," J. Opt. Soc. Am. B 22, 2001-2008 (2005).

T. W. Crowe, W. L. Bishop, D. W. Porterfield, J. L. Hesler, R. M. Weikle, "Opening the terahertz window with integrated diode circuits," IEEE J. Solid States Circuits 40, 2104-2110 (2005).

2004 (2)

J. Harrington, R. George, P. Pedersen, E. Mueller, "Hollow polycarbonate waveguides with inner Cu coatings for delivery of terahertz radiation," Opt. Express 21, 5263-5268 (2004).

K. Wang, D. M. Mittleman, "Metal wires for terahertz waveguiding," Nature 432, 376-379 (2004).

2002 (1)

H. Han, H. Park, M. Cho, J. Kim, "Terahertz pulse propagation in a plastic photonic crystal fiber," Appl. Phys. Lett. 80, 2634 (2002).

2001 (1)

2000 (1)

R. Mendis, D. Grischkowsky, "Plastic ribbon THz waveguides," J. Appl. Phys. 88, 4449-4451 (2000).

1997 (1)

É. I. Alekseev, E. N. Bazarov, "Enhancement of the precision of fiber-optic interferometers by using couplers with high spectral power or antisymmetric supermode cutoff," Tech. Phys. Lett. 23, 568-569 (1997).

1988 (1)

A. G. Bulushev, Y. V. Gurov, E. M. Dianov, A. V. Kuznetsov, O. G. Okhotnikov, V. M. Paranomov, "Spectral and polarization selective fiber-optic elements," J. Lightw. Technol. 6, 1575-1585 (1988).

1987 (1)

1985 (1)

J. E. Carlstrom, R. L. Plambeck, D. D. Thornton, "A continuously tunable 65–115 GHz Gunn Oscillator," IEEE Trans. Microw. Theory Tech. 33, 610-619 (1985).

Appl. Phys. Lett. (1)

M. Skorobogatiy, A. Dupuis, "Ferroelectric all-polymer hollow Bragg fibers for terahertz guidance," Appl. Phys. Lett. 90, 113514 (2007).

Appl. Phys. Lett. (1)

H. Han, H. Park, M. Cho, J. Kim, "Terahertz pulse propagation in a plastic photonic crystal fiber," Appl. Phys. Lett. 80, 2634 (2002).

IEEE J. Quant. Electron. (1)

P. J. Chiang, C. L. Wu, C. H. Teng, C. S. Yang, H. C. Chang, "Full-vectorial optical waveguide mode solvers using multidomain pseudospectral frequency-domain (PSFD) formulations," IEEE J. Quant. Electron. 44, 56-66 (2008).

IEEE J. Solid States Circuits (1)

T. W. Crowe, W. L. Bishop, D. W. Porterfield, J. L. Hesler, R. M. Weikle, "Opening the terahertz window with integrated diode circuits," IEEE J. Solid States Circuits 40, 2104-2110 (2005).

IEEE Trans. Microw. Theory Tech. (1)

J. E. Carlstrom, R. L. Plambeck, D. D. Thornton, "A continuously tunable 65–115 GHz Gunn Oscillator," IEEE Trans. Microw. Theory Tech. 33, 610-619 (1985).

IEEE Trans. Microw. Theory Tech. (1)

R. I. Hunter, D. A. Robertson, P. Goy, G. M. Smith, "Design of high-performance millimeter wave and sub-millimeter wave quasi-optical isolators and circulators," IEEE Trans. Microw. Theory Tech. 55, 890-898 (2007).

J. Appl. Phys. (1)

R. Mendis, D. Grischkowsky, "Plastic ribbon THz waveguides," J. Appl. Phys. 88, 4449-4451 (2000).

J. Lightw. Technol. (1)

A. G. Bulushev, Y. V. Gurov, E. M. Dianov, A. V. Kuznetsov, O. G. Okhotnikov, V. M. Paranomov, "Spectral and polarization selective fiber-optic elements," J. Lightw. Technol. 6, 1575-1585 (1988).

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

Nature (1)

K. Wang, D. M. Mittleman, "Metal wires for terahertz waveguiding," Nature 432, 376-379 (2004).

Opt. Express (1)

J.-Y. Lu, C.-C. Kuo, C.-M. Chiu, H.-W. Chen, Y.-J. Hwang, C.-L. Pan, C.-K. Sun, "THz interferomertric imaging using subwavelength plastic fiber based THz endoscope," Opt. Express 16, 2494-2501 (2008).

Opt. Express (2)

J. A. Deibel, K. Wang, M. D. Escarra, D. Mittleman, "Enhanced coupling of terahertz radiation to cylindrical wire waveguides," Opt. Express 14, 279-290 (2006).

J. Harrington, R. George, P. Pedersen, E. Mueller, "Hollow polycarbonate waveguides with inner Cu coatings for delivery of terahertz radiation," Opt. Express 21, 5263-5268 (2004).

Opt. Lett. (4)

Phys. Rev. E (1)

P. J. Chiang, C. P. Yu, H. C. Chang, "Analysis of two-dimensional photonic crystals using a multidomain pseudospectral method," Phys. Rev. E 75, 026703 (2007).

Tech. Phys. Lett. (1)

É. I. Alekseev, E. N. Bazarov, "Enhancement of the precision of fiber-optic interferometers by using couplers with high spectral power or antisymmetric supermode cutoff," Tech. Phys. Lett. 23, 568-569 (1997).

Other (4)

H. A. Haus, Waves and Fields in Optoelectronics (Prentice-Hall, 1984).

A. W. Snyder, J. D. Love, Optical Waveguide Theory (Chapman and Hall, 1983).

Golay cells, Inc.Microtech Instruments Eugene www.mtinstruments.com.

A. Ziabicki, Fundamentals of Fibre Formation (Wiley, 1976).

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