Pattern Design of Diffractive Optical Sensor Elements for Multiplex Interferometry

In interferometric optical sensors, phase information is extracted from the modulated light intensity. case of free-standing interferometers, operating through far field interferogram, multiplex detection not trivial. Multi-pinhole or multi-microdisk interferometry are examples common-path interferometers that allow detection. Thereby an unambiguous interference pattern required, with no overlap multiple spatial frequencies. A common in multi-pinhole a circular arrangement. To increase element density pattern, Golomb rulers interesting concept. and rectangles known sonar radar applications. Recently they were applied for encoding quantum systems. this publication we investigate different designs diffractors produce unique We introduce design algorithms. The optimization criteria uniqueness frequencies, which show any other frequency, microdisk pattern. patterns by about 30% compared to Depending on area, Archimedes spiral surpasses up 13% square referenced area. validate theoretically designed patterns, fabricated basis photonic crystal elements characterized optically.