Title :
A novel device for detecting the polarization direction of linear polarized light using integrated subwavelength gratings and photodetectors
Author :
Chen, Erli ; Chou, Stephen Y.
Author_Institution :
Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN, USA
Abstract :
A solid-state device that can be used to detect the polarization direction of linear polarized light is proposed. The device consists of six transmission gratings with periods in the subwavelength region of the incident light and six photodetectors integrated separately underneath each grating. A variable, defined through the photocurrent ratios of the grating-photodetector pairs, shows a one-to one correspondence with the angle between the electric vector of the incident linear polarized light and the orientation of the gratings´ fingers, which is therefore used to determine the polarization direction. An angular resolution of 0.2/spl deg/ can be achieved.
Keywords :
diffraction gratings; integrated optics; light polarisation; optical polarisers; photoconductivity; photodetectors; angular resolution; electric vector; grating; grating finger orientation; grating-photodetector pairs; incident linear polarized light; integrated subwavelength gratings; linear polarized light; one-to one correspondence; optical polarisers; photocurrent ratios; photodetectors; polarization direction detection; solid-state device; subwavelength region; transmission gratings; Fingers; Gratings; Instruments; Laboratories; Optical polarization; Photoconductivity; Photodetectors; Solid state circuits; Vectors; Wavelength measurement;
Journal_Title :
Photonics Technology Letters, IEEE
