Interference Phenomena in Waveguides with Two Corrugated Boundaries

Avrutsky, Ivan; Svakhin, A S; Sychugov, V A

doi:10.1080/09500348914551351

Cited by 50 publications

(28 citation statements)

References 5 publications

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“…The nanopores on the two sides of the metagrating can be regarded as two independent scattering objects that simultaneously diffract the resonant ridge mode into the slab mode. [ 32 ] Thus, the lateral leakage can be eliminated by building a destructive interference between the diffracted waves [ E L(±) and E R(±) ], as shown in Figure 1c,d. Here, E L(±) is the electric field scattered from the left nanopores, E R(±) is the electric field scattered from the right nanopores, (±) denotes the propagation direction of the diffracted slab mode.…”

Section: Design and Analysismentioning

confidence: 99%

“…The diffraction strengths for the left and right nanopores are equal since the metagrating is symmetric, so the only issue is to control the phase transition over the ridge region (− w r /2 < x < w r /2). It should be noted that there is an intrinsic phase reversal between E L(±) and E R(±) [ 25,26,32 ]

φ false[E_{normalL false(+ false)} false] = φ false[E_{normalL false(- false)} false] = π + φ false[E_{normalR false(+ false)} false] = π + φ false[E_{normalR false(- false)} false]

Therefore, the phase transition should be 2 m π to build a destructive interference. Thus, the FP condition can be written as [ 16 ]

m λ_{normalFP} = n_{s, neff} w_{normalr}

where m is the interference order, λ FP is the interference wavelength, n s , eff is the effective index of the slab mode in the ridge region, w r is the ridge width.…”

Section: Design and Analysismentioning

confidence: 99%

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Silicon‐Waveguide‐Integrated High‐Quality Metagrating Supporting Bound State in the Continuum

Shi

2020

Laser & Photonics Reviews

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The photonic bound state in the continuum (BIC) is a spatially bounded eigen state that can be realized in the form of a supercavity mode with an ultrahigh quality factor. The high‐quality supercavity resonance can be supported by photonic crystal slabs, asymmetric metasurfaces, and high‐contrast gratings. However, these schemes all suffer from bulky device size and complex experimental setup. Herein, a silicon‐waveguide‐integrated high‐quality metagrating is proposed and demonstrated as a new platform to manipulate the supercavity mode. The shallow‐ridge metagrating is directly embedded in the silicon slab waveguide, so the input slab mode can be coupled into the resonant ridge mode, which can be further transformed into the supercavity mode by utilizing the intra‐waveguide Fabry–Perot interference. Such an effect has been experimentally verified by the fabricated devices. The metagrating operating near the supercavity regime is also experimentally realized with a high quality factor ≈5200. As an application, such high‐quality metagrating is exploited to realize the temperature sensing with a high temperature sensitivity ≈77 pm K−1. The proposed integrated metagrating provides a novel approach to harness the BIC, paving ways for a new class of BIC‐based nanophotonic devices with high performance, chip‐scale footprint, and long‐term stability.

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Section: Design and Analysismentioning

confidence: 99%

φ false[E_{normalL false(+ false)} false] = φ false[E_{normalL false(- false)} false] = π + φ false[E_{normalR false(+ false)} false] = π + φ false[E_{normalR false(- false)} false]

Therefore, the phase transition should be 2 m π to build a destructive interference. Thus, the FP condition can be written as [ 16 ]

m λ_{normalFP} = n_{s, neff} w_{normalr}

where m is the interference order, λ FP is the interference wavelength, n s , eff is the effective index of the slab mode in the ridge region, w r is the ridge width.…”

Section: Design and Analysismentioning

confidence: 99%

Silicon‐Waveguide‐Integrated High‐Quality Metagrating Supporting Bound State in the Continuum

Shi

2020

Laser & Photonics Reviews

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“…Analytical formulas for radiation losses coefficients were derived using the first order Reyleigh-Fourier method Avrutsky et al, 1989. The waveguide structure ( Fig.…”

Section: Short Grating Schemementioning

confidence: 99%

High sensitivity waveguide grating sensor based on radiative losses

Kochergin

Avrutsky

Zhao

2000

Biosensors and Bioelectronics

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“…The most common preferential grating couplers (used mostly for output grating couplers) are: (a) the volume holographic grating coupler (VHGC) originally proposed by Kogelnik and Sosnowski [13], which in the slanted case provides high coupling efficiency and high preferential coupling in integrated optics [4,14]; (b) the slanted parallelogramic surface-relief grating coupler (SPSRGC) proposed by Li and Sheard [15,16]; (c) the double-corrugated surface-relief grating coupler (DCSRGC) proposed by Avrutsky et al [17,18]; and (d) the reflecting-stack surface-relief grating coupler (RSSRGC) proposed by Roncone et al [19,20].…”

Section: Introductionmentioning

confidence: 99%

Preferential input-waveguide grating couplers: rigorous analysis using the pseudospectral time-domain method

Παπαδόπουλος

Glytsis

2012

Appl. Opt.

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Preferential input-waveguide grating couplers are rigorously analyzed using the pseudospectral time-domain method in the total field/scattered field formulation for TE and TM polarizations in conjunction with the convolutional perfect matching layer approach. Four kinds of preferential input-waveguide grating couplers are studied: the volume holographic grating coupler, the slanted parallelogrammic surface-relief grating coupler, the double-corrugated surface-relief grating coupler, and the reflecting-stack surface-relief grating coupler. Coupler's input coupling efficiencies to various waveguide modes are calculated. In addition, a comparative study of performance is presented in terms of the main design parameters and the operational free-space wavelength.

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Interference Phenomena in Waveguides with Two Corrugated Boundaries

Cited by 50 publications

References 5 publications

Silicon‐Waveguide‐Integrated High‐Quality Metagrating Supporting Bound State in the Continuum

Silicon‐Waveguide‐Integrated High‐Quality Metagrating Supporting Bound State in the Continuum

High sensitivity waveguide grating sensor based on radiative losses

Preferential input-waveguide grating couplers: rigorous analysis using the pseudospectral time-domain method

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