High performance optical sensor based on double compound symmetric gratings

Abstract

A high performance optical sensor based on a double compound symmetric gratings (DCSGs) structure is designed. The reflection spectrum of the DCSG is investigated by utilizing a method that combines a theoretical model with the eigenmode information of the grating structure. The theoretical results, which are observed to agree well with those acquired by rigorous coupled-wave analysis, show that the linewidth of the reflection spectrum decreases upon the increasing distance between the grating strips. This research work will lay a foundation for studying high performance integrated optical sensors in miniature nanostructures.

Label-Free Bound-States-in-the-Continuum Biosensors

“…All-dielectric structures that support BICs have been widely used in the design of high- Q biosensors based on their advantages of low loss and high functionality. In this section, some all-dielectric BICs biosensors are introduced, including BICs gratings [ 57 , 58 , 59 , 60 , 61 , 62 , 63 ], symmetry-broken [ 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 ] and topological-boundary-states-governed [ 78 ] BICs metasurfaces, and BICs PhCSs [ 56 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 ].…”

“…Essentially, this setting can make the RI distribution of the grating layer non-uniform within a grating period, so a quasi-BIC with a high FOM can be obtained under specific asymmetric parameters. Based on the BICs-supported dual-grating metamembranes proposed by Hemmati et al [ 87 ], a double compound symmetric grating was designed by Shi et al [ 58 ], as shown in Figure 3 b. The resonant linewidth of quasi-BICs was tuned by changing the gap of the grating ridges, and a high FOM of 31,467 can be theoretically achieved.…”

“…( a ) GMR and BIC modes excited by an asymmetric silicon grating and their Hy field distribution with different degrees of symmetry breaking (reprinted with permission from [ 57 ], ©2021, The Optical Society). ( b ) double compound symmetric grating with a localized electric field (reprinted with permission from [ 58 ], ©2022, Chinese Optics Letters). ( c ) Si-PDMS symmetry-broken grating with temperature self-compensation function (reprinted with permission from [ 59 ], ©2022, IOP).…”

Polarization Insensitivity Research of the Three-layer Silicon-based Symmetric Cascade Optical Sensor

“…Resonance sensors, known for their high sensitivity, label-free detection, miniaturization, and real-time monitoring capabilities, have been widely applied in ocean investigation [23], environmental monitoring [24,25], biomedicine [26], and liquid detection [27]. Lu et al proposed a one-dimensional GMR-based resonant grating sensor that uses a wavelength-tunable light source to track narrow resonant reflection peaks, achieving high sensitivity detection [28].…”