4 April 2005 Multistage polymeric lens structure in silica-waveguides for photonic functional circuits
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Abstract
A waveguide lens composed of multistage polymer-filled thin grooves in a silica planar lightwave circuit (PLC) is proposed and the low-loss structure is designed. Both an imaging optical system and a Fourier-Transform optical system can be configured in a PLC by use of a waveguide lens. It makes a PLC functional and its design flexible. Moreover, a focal length of a lens is tunable with large thermo-optic effect of the polymer. A concatenated lens is formed to attain a desirable focal length with low-loss. The thickness of each lens and the spacing are about 10-50 microns. The simulation showed that the radiation loss of the light propagate through 20-stage grooves filled with a polymer was only 0.868 dB when the refractive index of the polymer was 1.57, the groove width was 30 microns, and the spacing between adjacent grooves was 15 microns. For example, the single lens structure that the center thickness is 30 microns, the diameter is 300 microns, and the refractive index of the polymer was 1.57, have a focal length of 4600 microns. The focal length of 450 microns can be obtained with 20-stage concatenated lens structure. The larger numerical aperture can be realized with a polymer of higher refractive index. We have applied the concatenated lens structure to various photonic circuits including optical couplers, a variable optical attenuator.
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Atsushi Tate, Atsushi Tate, Takanori Suzuki, Takanori Suzuki, Hiroyuki Tsuda, Hiroyuki Tsuda, } "Multistage polymeric lens structure in silica-waveguides for photonic functional circuits", Proc. SPIE 5724, Organic Photonic Materials and Devices VII, (4 April 2005); doi: 10.1117/12.589980; https://doi.org/10.1117/12.589980
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