Goos–Hänchen shifts in an epsilon-near-zero slab

Wen, Jisen; Zhang, Junxiang; Wang, Li‐Gang; Zhu, Shi‐Yao

doi:10.1364/josab.34.002310

Cited by 32 publications

(7 citation statements)

References 31 publications

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“…The asymmetry geometric parameter M1 and M2 determine the value of the GH shift, i.e., resonance will become stronger and result in a larger GH shift for specific values of the asymmetric parameter. Here, for the stationary phase method, the lateral GH shift for the reflected and transmitted beams can be calculate by using the expression [41][42][43]…”

Section: Simulation Resultsmentioning

confidence: 99%

Adjacent Asymmetric Tilt Grating Structure With Strong Resonance Assisted by Quasi-Bound States in the Continuum

Ruan

Wang

et al. 2022

IEEE Photonics J.

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In the field of optics, bound state in the continuum (BIC) as a special state to be researched in many photonic crystals and periodic structures, which can produce strong resonance and an ultrahigh Q factor. Some designs of narrowband transmission filters, lasers, and sensors are proposed based on excellent optical properties of quasi-BIC. In this paper, we consider symmetrical rectangular grating structure firstly. Then cut off a corner of rectangular gratings, the Fano line of quasi-BIC can be observed in the spectrum. After that, we change the oblique parameter of the other rectangular grating, which can further decrease the Fano line width. In the momentum space, the change of structure means topological charges split from q=1 into half charges q=1/2. We analyze guided mode resonance (GMR) excitation of the grating structure, and discuss the dispersion relations in the waveguide layer with the position of BIC in energy bands. In addition, the spectrum exhibits asymmetric line-shapes with different values of the asymmetry parameters, M1 and M2. BIC is transformed into quasi-BIC as the symmetry of the structure broken. Thus, a large Goos-Hänchen shift can be achieved as a result of ultrahigh Q factor of quasi-BIC. This work demonstrates a double trapezoid structure with strong resonance properties, which has significant implications for exploring the phenomenon of BIC.

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Section: Simulation Resultsmentioning

confidence: 99%

Adjacent Asymmetric Tilt Grating Structure With Strong Resonance Assisted by Quasi-Bound States in the Continuum

Ruan

Wang

et al. 2022

IEEE Photonics J.

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show abstract

“…The asymmetry geometric parameter M 1 and M 2 determine the value of the GH shift, i.e., resonance will become stronger and result in a larger GH shift for specific values of the asymmetric parameter. Here, for the stationary phase method, the lateral GH shift for the reflected and transmitted beams can be calculate by using the expression [22][23][24][25],…”

Section: Simulation Resultsmentioning

confidence: 99%

Formation of bound states in the continuum in double trapezoidal grating

Ruan¹,

Wang²,

Hu³

et al. 2022

Preprint

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In the field of optics, bound state in the continuum (BIC) has been researched in many photonic crystals and periodic structures due to a strong resonance and an ultrahigh Q factor. Some designs of narrowband transmission filters, lasers, and sensors were proposed based on excellent optical properties of BIC. In this paper, we consider symmetrical rectangular grating structure firstly, then cut off the corner of one of the gratings, the Fano peak of quasi-BIC can be observed in the spectrum. After that, we further change the tilt parameter of the other grating, which minimizes the Fano line width. In the momentum space, the process of structural change corresponds to topological charges split from q = 1 into two half charges q = 1/2. We analyze guided mode resonance (GMR) excitation of the grating structure, and discuss the dispersion relations in the waveguide layer with the position of BIC in energy bands. In addition, the reflectance spectrum is found to exhibit asymmetric lineshapes with different values of the asymmetry parameters, M1 and M2. BIC is transformed into quasi-BIC as the symmetry of the structure is broken. Thus, a large Goos-Hänchen shift can be achieved as a result of asymmetrical Fano line shape in quasi-BIC. This work demonstrates a double trapezoid structure with strong resonance properties, which has significant implications for exploring the phenomenon of BIC.

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“…Since the shift at a single dielectric surface is quite small, i.e., usually subwavelength scale, much attention has been devoted to enhancing this effect by applying different materials and structures. Up to now, the enhancement has been illustrated using gradient metasurfaces [8], epsilon-near-zero slabs [9], weakly absorbing slabs [10], subwavelength gratings [11], graphene [12][13][14], a coherent medium [15], and a cavity optomechanical system [16].…”

Section: Introductionmentioning

confidence: 99%

Continuous Goos-Hänchen Shift of Vortex Beam via Symmetric Metal-Cladding Waveguide

Kan

Zhi²,

Yin

et al. 2022

Materials

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Goos-Hänchen shift provides a way to manipulate the transverse shift of an optical beam with sub-wavelength accuracy. Among various enhancement schemes, millimeter-scale shift at near-infrared range has been realized by a simple symmetrical metal-cladding waveguide structure owing to its unique ultrahigh-order modes. However, the interpretation of the shift depends crucially on its definition. This paper shows that the shift of a Gaussian beam is discrete if we follow the light peak based on the stationary phase approach, where the M-lines are fixed to specific directions and the beam profile is separated near resonance. On the contrary, continuous shift can be obtained if the waveguide is illuminated by a vortex beam, and the physical cause can be attributed to the position-dependent phase-match condition of the ultrahigh-order modes due to the spatial phase distribution.

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Goos–Hänchen shifts in an epsilon-near-zero slab

Cited by 32 publications

References 31 publications

Adjacent Asymmetric Tilt Grating Structure With Strong Resonance Assisted by Quasi-Bound States in the Continuum

Adjacent Asymmetric Tilt Grating Structure With Strong Resonance Assisted by Quasi-Bound States in the Continuum

Formation of bound states in the continuum in double trapezoidal grating

Continuous Goos-Hänchen Shift of Vortex Beam via Symmetric Metal-Cladding Waveguide

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