Non-periodic Subwavelength Transmission Convergence Grating
YUE Chun-yun
JIANG Xi-mei
FANG Wen-jing
FAN Xin-ye
BAI Cheng-lin
NIU Hui-juan
Abstract：Sub-wavelength grating as a novel optical device can achieve beam deflection, power split, convergence, polarization splitting and other functions.Coupling for spatial light and beam type requirements for micro laser output light.Sub-wavelength grating with transmission beam convergence effect is proposed.By designing the structure of the sub-wavelength grating, the wavefront phase of the sub-wavelength grating is controlled so that the sub-wavelength grating has a high transmittance to achieve the convergent effect of the transmitted beam.The finite element analysis (FEM) was used to simulate the numerical value of the designed one-dimensional non-periodic sub-wavelength convergence grating.The simulation results show that the non-periodic grating designed by the finite element method has convergent effect on the divergent beam.The simulated transmission grating with a focal length of10μm is converged.The actual focal length fx obtained by the simulation is 7.715μm and the transmittance is 81.8％.It is expected to have important applications in the field of optical communication device integration and space optical coupling.
Keywords：sub-wavelength gratingtransmitted beambeam convergence
Publication Date：2018-01-01
Online Publishing Date：2026-08-28(First online date of this platform, not the publication date of the document)
Pages：5( 13-17 )