Acta Optica Sinica, Volume. 40, Issue 14, 1405001(2020)
Polarization-Independent Multilayer Slanted Grating with High Efficiency and Broad Spectral and Angular Bandwidths Under Normal Incidence
An anomalously reflective polarization-independent high-efficiency multilayer slanted grating with broad spectral and angular bandwidths under normal incidence was designed by rigorous coupled wave analysis and using a simulated annealing algorithm. To enhance the efficiency and broaden the bandwidth, a four-layer sandwiched structure with a gradually changing refractive index was proposed. Based on the proposed structure, we designed a polarization-independent anomalously reflective grating structure in the visible band. It exhibits a spectral bandwidth of 130 nm (550--680 nm) with -1st efficiencies higher than 93% and polarization-dependent loss less than 0.2 dB. Moreover, simulation results suggest that the grating structure features an angular bandwidth of 47° (-2°--45°) and large range of fabrication tolerances. Therefore, the proposed multilayer slanted grating will attract great interest for its potential applications in virtual/augmented reality displays and metasurface-based devices, especially for metalenses in the visible range.
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Yunkai Lu, Junjie Yu, Zhengkun Yin, Changhe Zhou. Polarization-Independent Multilayer Slanted Grating with High Efficiency and Broad Spectral and Angular Bandwidths Under Normal Incidence[J]. Acta Optica Sinica, 2020, 40(14): 1405001
Category: Diffraction and Gratings
Received: Mar. 4, 2020
Accepted: Apr. 13, 2020
Published Online: Jul. 23, 2020
The Author Email: Yu Junjie (junjiey@siom.ac.cn), Zhou Changhe (chazhou@mail.shcnc.ac.cn)