Optical exceptional point and its application in tactile sensing
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Tactile sensor is a type of device widely used in our daily life. However, the low spatial resolution of the state-of-the-art tactile sensor and imager restricts their applications in the micro and nano-scale researches. In this thesis, an optical exceptional point based tactile sensor intrinsically of highly scalable spatial resolution is proposed to overcome this fundamental limitation. The background knowledge about the optical tactile sensor was first discussed. Then the design and optimization process of an optical exceptional point is investigated based on the unidirectional reflection-less structure. The structures are fabricated and validated in experiments. In the end, the unidirectional reflection-less structures are proposed to be integrated in a chessboard configuration to achieve the high spatial resolution tactile sensor. The measurement setup is also discussed to characterize the performance of this sensor.