Thermooptical switches using coated microsphere resonators

We report the development of a novel optical switching technique consisting of a silica microsphere optical resonator coated by a conjugated polymer. A 250-/spl mu/m diameter silica microsphere was coated by dipping into a toluene solution of poly(2,5-dioctyloxy-1,4-phenylenevinylene). The resonator properties were characterized by evanescently coupling 1.55-/spl mu/m light propagating along a stripline-pedestal antiresonant reflecting optical waveguide into optical whispering gallery modes (WGMs) of the microsphere. WGM resonant frequency shifts as large as 3.2 GHz were observed when 405-nm pump light with a power density of /spl sim/10/sup 4/ mW/cm/sup 2/ was incident on the microsphere. The time constant of the observed frequency shifts is approximately 0.165 s, leading us to attribute the frequency shift to thermooptic effects. As microsphere resonators with WGM linewidths less than 2 MHz (corresponding to cavity Q>10/sup 8/) can be easily fabricated, initial measurements indicate that such a system is capable of thermooptically switching the WGM resonant frequency at speeds on the order of 100 ms.

[1]  Donal D. C. Bradley,et al.  Photophysics of a poly(phenylenevinylene) with alternating meta-phenylene and para-phenylene rings , 2000 .

[2]  S. Arnold,et al.  Excitation of resonances of microspheres on an optical fiber. , 1995, Optics letters.

[3]  Brent E. Little,et al.  Analytic theory of coupling from tapered fibers and half-blocks into microsphere resonators , 1999 .

[4]  V S Ilchenko,et al.  Frequency tuning of the whispering-gallery modes of silica microspheres for cavity quantum electrodynamics and spectroscopy. , 2001, Optics letters.

[5]  L C Kimerling,et al.  Planar integrated wavelength-drop device based on pedestal antiresonant reflecting waveguides and high-Q silica microspheres. , 2000, Optics letters.

[6]  K. Vahala,et al.  Fiber-optic add-drop device based on a silica microsphere-whispering gallery mode system , 1999, IEEE Photonics Technology Letters.

[7]  M. Ozaki,et al.  Picosecond to millisecond photoexcitation dynamics in blends of C60 with poly(p-phenylene vinylene) polymers , 1998 .

[8]  Jean-Michel Raimond,et al.  Strain-tunable high-Q optical microsphere resonator , 1998 .

[9]  M. Gorodetsky,et al.  Ultimate Q of optical microsphere resonators. , 1996, Optics letters.

[10]  L C Kimerling,et al.  Pedestal antiresonant reflecting waveguides for robust coupling to microsphere resonators and for microphotonic circuits. , 2000, Optics letters.

[11]  E. R. Thoen,et al.  Ultra-compact Si-SiO2 microring resonator optical channel dropping filters , 1998, IEEE Photonics Technology Letters.

[12]  H. Haus,et al.  Microring resonator channel dropping filters , 1997 .

[13]  J. Knight,et al.  Eroded monomode optical fiber for whispering-gallery mode excitation in fused-silica microspheres. , 1995, Optics letters.

[14]  T. Koch,et al.  Antiresonant reflecting optical waveguides in SiO2‐Si multilayer structures , 1986 .

[15]  J.-P. Laine,et al.  Microsphere resonator mode characterization by pedestal anti-resonant reflecting waveguide coupler , 2000, IEEE Photonics Technology Letters.

[16]  Jean-Michel Raimond,et al.  Very high-Q whispering-gallery mode resonances observed on fused silica microspheres , 1993 .

[17]  Vladimir S. Ilchenko,et al.  High-Q optical whispering-gallery microresonators: precession approach for spherical mode analysis and emission patterns with prism couplers , 1994 .