Goos–Hanchen shift in a metasurface of core–shell nanoparticles

Zoghi, Maryam

doi:10.1016/j.optcom.2020.126265

Cited by 6 publications

(3 citation statements)

References 64 publications

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“…[14,15] Currently, different methods have been proposed to achieve high Q factor resonance, all of which significantly improve the GH shift, but their maximum GH shift is located at the reflectance dip. [33][34][35][36] In these studies, the reflectivity that corresponds to the maximum GH shift is even less than 0.1%, which is not conducive to the detection of GH shift signals in practical applications.…”

Section: Introductionmentioning

confidence: 95%

Enhancing the Goos–Hänchen shift based on quasi-bound states in the continuum through material asymmetric dielectric compound gratings

Jiang 江,

Fang 方,

Zhan 占

2024

Chinese Phys. B

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Quasi-bound state in the continuum (QBIC) resonance is gradually attracting attention and being applied in Goos-Hänchen (GH) shift enhancement due to its high quality (Q) factor and superior optical confinement. Currently, symmetry-protected QBIC resonance is often achieved by breaking the geometric symmetry, but few cases are achieved by breaking the material symmetry. This paper proposes a dielectric compound grating to achieve a high Q factor and high reflection symmetry-protected QBIC resonance based on material asymmetry. Theoretical calculations show that the symmetry-protected QBIC resonance achieved by material asymmetry can significantly increase the GH shift up to -980 times the resonance wavelength, and the maximum GH shift is located at the reflection peak with unity reflectance. This paper provides a theoretical basis for designing and fabricating high-performance GH shift tunable metasurfaces/dielectric gratings in the future.

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Section: Introductionmentioning

confidence: 95%

Enhancing the Goos–Hänchen shift based on quasi-bound states in the continuum through material asymmetric dielectric compound gratings

Jiang 江,

Fang 方,

Zhan 占

2024

Chinese Phys. B

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“…Both the angular and lateral GH shifts depend on the polarization of the incident beam and have been extensively studied 8 – 14 An overview of the basic beam-shift phenomena and related effects is found in Ref. 15.…”

Section: Introductionmentioning

confidence: 99%

Sandwich heterostructure of transition metal dichalcogenide/graphene as tunable lateral reflection shifter

Zoghi

2023

J. Nanophoton.

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.The advent of nanotechnology has led to the inevitable need for miniaturization in optoelectronic devices. To achieve this goal, materials with low thickness, conductivity, and transparency, as well as a larger active area, must be developed. Experiments have proven that the opto-electrical properties of transition metal dichalcogenides (TMD)/graphene combinations are highly tunable. On the other hand, a notable feature of light when reflecting from an interface is its spatial and angular displacements. The “lateral shift” in the incident plane, referred to as the Goos–Hanchen (GH) shift, has garnered significant interest among researchers owing to its extensive range of applications. In our work, an atomically thin TMD/graphene/TMD sandwich heterostructure is proposed, and its spatial and angular GH shifts are investigated. The theoretical analysis includes various TMD materials such as MoSe2, MoS2, WSe2, and WS2. A detailed study of the effects of wavelength, polarization, incident angle, and number of TMD layers in symmetric and asymmetric structures suggests that this hybrid can serve as an ultrathin broadband tunable sensor in optical devices.

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“…If strong optical resonance with a high quality factor (quality factor, Q ) could be achieved, the reflection phase would dramatically vary around the resonant angle and lead to a large GH shift. In recent years, optical resonance structures (with high Q ) have been proposed, including photonic crystals, surface plasmon structures, metasurfaces of core–shell nanoparticles, metal gratings, and low absorption dielectric plates [ 12 , 13 , 14 , 15 ], which can enhance the GH shift. Although these optical resonance structures can significantly improve the GH shift, their maximum GH shift is located at the reflection dip and the reflectivity is extremely low, which makes it difficult to detect the GH shift signal.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Enhancement of the Goos–Hänchen Shift with a Metasurface Based on Bound States in the Continuum

2023

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The enhancement of the Goos–Hänchen (GH) shift has become a research hotspot due to its promoted application of the GH effect in various fields. However, currently, the maximum GH shift is located at the reflectance dip, making it difficult to detect GH shift signals in practical applications. This paper proposes a new metasurface to achieve reflection-type bound states in the continuum (BIC). The GH shift can be significantly enhanced by the quasi-BIC with a high quality factor. The maximum GH shift can reach more than 400 times the resonant wavelength, and the maximum GH shift is located exactly at the reflection peak with unity reflectance, which can be applied to detect the GH shift signal. Finally, the metasurface is used to detect the variation in the refractive index, and the sensitivity can reach 3.58 × 106 μm/RIU (refractive index unit) according to the simulation’s calculations. The findings provide a theoretical basis to prepare a metasurface with high refractive index sensitivity, a large GH shift, and high reflection.

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Goos–Hanchen shift in a metasurface of core–shell nanoparticles

Cited by 6 publications

References 64 publications

Enhancing the Goos–Hänchen shift based on quasi-bound states in the continuum through material asymmetric dielectric compound gratings

Enhancing the Goos–Hänchen shift based on quasi-bound states in the continuum through material asymmetric dielectric compound gratings

Sandwich heterostructure of transition metal dichalcogenide/graphene as tunable lateral reflection shifter

Theoretical Enhancement of the Goos–Hänchen Shift with a Metasurface Based on Bound States in the Continuum

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