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Micro-Displacement Sensor With Large Dynamic Range Based on Photonic Crystal Co-Directional Coupler

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6 Author(s)
Zhenfeng Xu ; State Key Lab. of Precision Meas. Technol. & Instrum., Tsinghua Univ., Beijing ; Liangcai Cao ; Ping Su ; Qingsheng He
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A novel micro-displacement sensor based on a photonic crystal (PhC) co-directional coupler and its sensing technique are presented. The coupler consists of a fixed and a movable PhC segments. Due to the translational symmetry of the PhC structure, this sensing technique is valid for a large displacement on the order of na (n is an integer, and a is the lattice constant of the PhC). After optimization, the outputs of the sensor are approximately sine functions of the displacement, thus it has the potential to achieve high resolution using a subdivision approach. These two characteristics ensure the large dynamic range of the micro-sensor. The properties of the micro-displacement sensor are analyzed using the coupled-mode theory and simulated using the finite-difference time-domain method

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Quantum Electronics, IEEE Journal of  (Volume:43 ,  Issue: 2 )