光学
栅栏
激光线宽
窄带
极化(电化学)
耦合模理论
衍射光栅
材料科学
物理
透射率
折射率
衍射效率
物理化学
化学
激光器
作者
Michael Barrow,Jamie Phillips
出处
期刊:Optics Letters
[The Optical Society]
日期:2020-06-26
卷期号:45 (15): 4348-4348
被引量:21
摘要
We present a high-index contrast dielectric grating design for polarization-independent narrowband transmission filtering. A reduced symmetry hexagonal lattice allows coupling to symmetry-protected modes (bound states in the continuum) at normal incidence, enabling high-Q spectral peaks. The peak linewidth is tunable via degree of geometric symmetry reduction. Using diffraction efficiency calculations, we gain further insight into the design and physics of one-dimensional (1D) and two-dimensional (2D) asymmetric high contrast gratings. The grating design provides a filter response that is simultaneously polarization independent and functional at normal incidence, overcoming limitations of 1D asymmetric gratings and 2D symmetric gratings.
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