Multistage Polymeric Lens Structures Integrated into Silica Waveguides

概要

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A waveguide lens, composed of multistage polymer-filled thin grooves in a silica planar lightwave circuit (PLC) is proposed and a low-loss structure has been designed. A waveguide lens in a silica slab waveguide has been fabricated using reactive ion etching (RIE) and formed by filling with polymer. Both an imagding optical system and a Fourier-transform optical system can be configured in a PLC using a waveguide lens. It renders the PLC functional and its design flexible. To obtain a shorter focal length with a low insertion loss, it is more effective to use a multistage lens structure. An imaging optical system and a Fourier-transform optical system with a focal length of less than 1000 μm were fabricated in silica waveguides using a multistage lens structure. The lens imaging waveguides incorporate a 16–24-stage lens, with insertion losses of 4–7 dB. A $4 \times 4$ optical coupler, using a Fourier-transform optical system, utilizes a 6-stage lens with losses of 2–4 dB.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2006-08-15