Fig. 2: Design of the photonic displacement sensor.
From: Towards fully integrated photonic displacement sensors
a The electron micrograph shows the complete structure consisting of a six-way photonic crystal waveguide crossing (see waveguide section in b), a Si antenna with radius r ≈ 260 nm placed in the center of the crossing (depicted in c), and six tapered out-couplers (see example in d).
