Photodetector based on Vernier-Enhanced Fabry-Perot Interferometers with a Photo-Thermal Coating.

ABSTRACT: We present a new type of fiber-coupled photodetector with a thermal-based optical sensor head, which enables it to operate even in the presence of strong electro-magnetic interference and in electrically sensitive environments. The optical sensor head consists of three cascaded Fabry-Perot interferometers. The end-face surface is coated with copper-oxide micro-particles embedded in hydrogel, which is a new photo-thermal coating that can be readily coated on many different surfaces. Under irradiation, photons are absorbed by the photo-thermal coating, and are converted into heat, changing the optical path length of the probing light and induces a resonant wavelength shift. For white-light irradiation, the photodetector exhibits a power sensitivity of 760?pm/mW, a power detection limit of 16.4??W (i.e. specific detectivity of 2.2?×?10⁵?cm.?Hz/W), and an optical damage threshold of ~100?mW or ~800?mW/cm². The response and recovery times are 3.0?s (~90% of change within 100?ms) and 16.0?s respectively.

SUBMITTER: Chen GY 

PROVIDER: S-EPMC5282560 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature