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In this paper, we propose a novel structure for biosensors based on a diffraction grating to diagnose four types of cancers cells. This biosensor is used to detect Hela, Jurkat, PC12, MDA-MB-231 and MCF-7 cancerous cells, based on their refractive indices. The present configuration consists of a glass layer covered by a gold layer, a grating coated...
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In this paper, a sensor with a multi-layered structure based on MXene and chalcogenide which is based on germanium (Ge)-antimony (Sb) telluride (Te) (GST) as an active plasmonic material is designed. The design is simulated in 2D. The design is a general sensor to detect refractive index from 1 to 1.15. Here, the design structure is arranged by pla...
In recent years, plasmonic photonic crystal fiber (PCF) refractive index (RI) sensors have gained significant attention due to their high sensitivity, label-free, and real-time monitoring capabilities. However, many existing PCF sensors suffer from narrow detection ranges, high propagation losses, long device lengths, and fabrication challenges, wh...
In this paper, we analyze and review the performance of refractive index (RI) sensors for detecting human blood groups (BGs). Additionally, we introduce the standard deviation (SD) as a means to identify the optimal highest resolution sensor. We design and simulate the behavior of 14 different nano-RI sensors based on Metal-Insulator-Metal (MIM) pl...
Topological photonic sensors have emerged as a breakthrough in modern optical sensing by integrating topological protection and light confinement mechanisms such as topological states, quasi-bound states in the continuum (quasi-BICs), and Tamm plasmon polaritons (TPPs). These devices exhibit exceptional sensitivity and high-Q resonances, making the...
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... These nodes are separated in momentum space by an axial vector 2b, with the separation oriented along the z-axis, which can seen from figure 1(b). Then, the dielectric permittivity tensor of a WSM can be expressed as [32,33]: ...
... All relevant physical parameters are described in detail in [32,34]. A comparative summary of the key parameters for four different WSMs is provided in table 1. Co Sn S 3 2 2 is selected as the representative nonreciprocal material in this work. ...
The photonic spin Hall effect manifests as spin-dependent transverse displacements of light, offering potential for applications in polarization-sensitive optics and quantum sensing. This work introduces an innovative design that amplifies the photonic spin Hall effect by incorporating a Weyl semimetal layer into a grating waveguide structure. Due to the anisotropic dielectric tensor and intrinsic nonreciprocal optical behavior, Weyl semimetals are capable of significantly enhancing spin-dependent light shifts. By examining the light–matter interaction within the proposal, we reveal a modulation of spin–orbit coupling that amplifies spin Hall shifts. The structural parameters of the design are further optimized, providing a tunable platform for controlling the spin Hall effect response across a broad range of wavelengths. Numerical simulations reveal a substantial enhancement of the photonic spin Hall effect, outperforming conventional guided mode resonance systems. This enhancement opens new avenues for the development of nonreciprocal photonic devices, including spin-controlled modulators and optical isolators.
... Moreover, the absorption spectra exhibit a significant redshift as the refractive index changes making it possible to distinguish different types of media. The refractive index sensitivity, which quantifies the ability to detect variation in the environmental refractive index, is defined as S = Δλ/Δn [38]. Here, Δλ and Δn represent the shift in the resonance wavelength and the change in the refractive index, respectively. ...
Recently, the concept of the bound states in the continuum (BICs) has emerged, demonstrating a highly enhanced light–matter interaction. To achieve perfect absorption, symmetry-protected BICs have been explored as it is convenient to realize and can easily transition into excitable quasi-BICs by inducing asymmetry. However, in most studies, small symmetry breaking parameters are required to achieve perfect absorption with ultra-narrowband, which poses a significant challenge in nanofabrication. In this paper, we propose a hybrid hetero-metasurface, composed of a hetero-nanostructure and a monolayer graphene. The hetero-nanostructure incorporates a hetero-bilayer grating, consisting of a SiO2 upper grating and a Si lower grating, which is positioned on a SiO2 spacer above a perfect electric conductor (PEC) mirror. This design significantly increases symmetry breaking parameters for achieving ultra-narrowband perfect absorption, leading to perfect absorption with a full width at half maximum (FWHM) of 0.045 nm at a symmetry breaking parameter of 15 nm. This represents an order of magnitude larger symmetry breaking parameter compared to the hybrid non-hetero-metasurface. The hybrid hetero-metasurface boasts superior performance, with a sensitivity of 190 nm R⁻¹IU⁻¹ and a figure of merit (FOM) reaching up to 5428 RIU⁻¹. As well as narrowband optical switching can be accomplished by altering the polarization direction of the incident light. This work offers a novel approach for achieving ultra-narrowband absorption based on symmetry-protected quasi-BICs, applicable to sensing and narrowband optical switching.
... Optical sensors have gradually become the focus of researchers, and they have applications in various research fields [17][18][19][20][21]; for example, environmental monitoring [22], chemical characterization [23], biosensing [24], etc. Optical sensors can be roughly divided into two types according to material-metal-based surface plasmon resonance sensors [25,26] and dielectric-based guided-mode resonance sensors [27,28]. Compared to dielectric sensors, metal surface plasmon resonance sensors usually have a large near-field enhancement and a high sensitivity [25]. ...
In recent years, metal surface plasmon resonance sensors and dielectric guided-mode resonance sensors have attracted the attention of researchers. Metal sensors are sensitive to environmental disturbances but have high optical losses, while dielectric sensors have low losses but limited sensitivity. To overcome these limitations, hybrid resonance sensors that combine the advantages of metal and dielectric were proposed to achieve a high sensitivity and a high Q factor at the same time. In this paper, a hybrid hollow cylindrical tetramer array was designed, and the effects of the hole radius, external radius, height, period, incidence angle, and polarization angle of the hollow cylindrical tetramer array on the refractive index sensing properties were quantitatively analyzed using the finite difference time domain method. It is found that the position of the resonance peaks can be freely tuned in the visible and near-infrared regions, and a sensitivity of up to 542.8 nm/RIU can be achieved, with a Q factor of 1495.1 and a figure of merit of 1103.3 RIU⁻¹. The hybrid metal–dielectric nanostructured array provides a possibility for the realization of high-performance sensing devices.
The absorption of light based on quasi-BICs is a significant factor influencing the performance of solar cells and photodetectors. Nevertheless, the development of multiple narrowband perfect absorbers remains a significant...
