Affiliation:
1. YONGJIANG Laboratory Ningbo Zhejiang China
Abstract
In this paper, we propose a method to accurately measure the refractive index modulation of VHG. By adjusting the position of the photon detector in real time, we can accurately measure the variation of the diffracted light intensity with the angle of the incident light, and combining the Rigorous Coupled Wave Analysis (RCWA) fitting, the refractive index modulation of the grating can be measured.