Ultrasensitive specific sensor based on all-dielectric metasurfaces in the terahertz range

Abstract

An ultrasensitive specific sensor based on all-dielectric metasurfaces in the terahertz range was proposed.

Boosting the terahertz absorption spectroscopy based on the stretchable metasurface

“…However, sweeping the incident angle at very small intervals is not easy to achieve in the actual experiments, and it is also difficult to precisely manufacture different unit cell structures with a thickness of tens of micrometers and a resolution of a few micrometers. 16,17 As one of the important mechanisms for realizing the local electric field, spoof surface plasmon polariton (SSP) on graphene 18 and metal-based metamaterials 19,20 have been diffusely used to detect the refractive index changes of the samples in the terahertz region. Ding et al proposed a thickness-multiplexed method to enhance the terahertz absorption via an evanescent wave.…”

“…In this case, it is not conducive to the efficient direct coupling of terahertz waves into the waveguides. 9 In addition, dielectric metagratings 13 and metamaterial structures 16 have been treated to boost the wide-band terahertz absorption spectroscopy of thin film samples. In general, a series of resonance peaks can be obtained by changing the incident angles of the electromagnetic waves or adopting different unit cells in the super cells.…”

Angular Transmission Response of In-Plane Symmetry-Breaking Quasi-BIC All-Dielectric Metasurfaces

“…37 Experimental and numerical studies were done on the angular responsivity of periodic arrays of symmetry-breaking high-index dielectric nanostructures in the shape of disks 38,39 and bars. 40 In a recent article, angle multiplexing was demonstrated in a high-Q metasurface comprising all-dielectric symmetry-breaking pairs of elliptical nanodisks. 36 The engineering of the optical response of alldielectric symmetry-breaking quads of elliptical nanodisks with mirror symmetries in two orthogonal directions has also been reported before; 41 however, not much has been reported regarding the angular response of such a structure.…”

“…Angular response is useful in areas such as wide-field imaging and filtering, spectroscopy, passive optical sensing of motion, and angle sensing . Experimental and numerical studies were done on the angular responsivity of periodic arrays of symmetry-breaking high-index dielectric nanostructures in the shape of disks , and bars . In a recent article, angle multiplexing was demonstrated in a high- Q metasurface comprising all-dielectric symmetry-breaking pairs of elliptical nanodisks .…”

Excitations of Multiple Fano Resonances Based on Permittivity-Asymmetric Dielectric Meta-Surfaces for Nano-Sensors

“…igh sensitivity sensors play a significant role in the field of opto-electronic applications, such as lasers [1], nonlinear optics [2], and optical switching [3]. To enhance device performance, High Q-factor resonances have been widely employed, including Fano resonance and bound states in the continuum (BIC) [4][5][6][7][8]. Fano resonance is a phenomenon manifested as an asymmetric spectral feature (Fano shape) due to the interference of a narrow resonance with a much broader band of states (continuum).…”