Near-Infrared Switch Effect of Polarization Modulation Induced by Guided Mode Resonance in Dielectric Grating

Abstract

Abstract Light intensity modulation is crucial to the development of optical imaging, optical sensing, and optical switch. The light intensity modulation methods, such as changing structural parameters, external temperature, or external voltage make the control process time consuming and complex. The plasmonic polarization modulation is an effective way to modulate light intensity, but this method is limited by the excitation of surface plasmons with transverse magnetic (TM) polarized light. Herein, we report another polarization modulation method of light intensity based on guided mode resonance in the dielectric grating excited by transverse electric (TE) polarized light. The nanosystem is composed of Si grating and TiN substrate. By adjusting the polarization states of the incident light from TE to TM, the proposed nanosystem exhibits an outstanding light intensity modulation performance with a relative modulation depth of 25833%. The proposed method provides another way for modulating light intensity, which has potential applications of optical switch, optical imaging, and optical anti-counterfeiting.