A Grating to Transfer Polarization Rotation to Straight Line Movement - Designs and Applications

This paper presents a grating be used to transfer a polarization rotation to a straight moving facula, so the rotation can be detected by locating the facula displacement with a line array image sensor. It can be used to build a new type of polarimeter with no mechanical rotating device, or an optical current or voltage transducer applied for electrical power systems with no rotary translation converter. The grating is a subwavelength radial polarization one, which is made of aluminum and fabricated by nano-electron beam direct write lithography. It consists of 12,000 units arranged in a line array, and each unit has a 1μm width and a 30' angle difference from adjacent ones. Its polarization and temperature characteristics are simulated and experimented. The TM wave transmittance is greater than 78%, and the extinction ratio is better than 27dB.