Terahertz (THz) radiation, which occupies the frequency band between microwaves and infrared light, is essential in many next ...

Abstract: In this paper, we propose and validate a new approach for increasing the optical bandwidth of waveguide grating couplers by using a center-symmetric grating structure. Our results ...

Abstract: The transport of grating blank at the nanometer scale is the key of diffraction grating fabrication technology. In this paper, a precision grating blank feeding system for a diffraction ...