Two-groove narrowband transmission filter integrated into a slab waveguide

Doskolovich, Leonid L.; Bezus, Evgeni A.; Bykov, Dmitry A.

doi:10.1364/prj.6.000061

Cited by 31 publications

(13 citation statements)

References 26 publications

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“…(18) lie on the "resonant" curves |R| = 1; this can be shown by direct substitution into Eq. (8). These point are shown with black crosses in Fig.…”

Section: Comparison With the Rigorous Simulationsmentioning

confidence: 88%

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Bound states in the continuum and high-Q resonances supported by a dielectric ridge on a slab waveguide

Bezus¹,

Bykov²,

Doskolovich³

2018

Photon. Res.

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We investigate the diffraction of guided modes of a dielectric slab waveguide on a simple integrated structure consisting of a single dielectric ridge on the surface of the waveguide. Numerical simulations based on aperiodic rigorous coupled-wave analysis demonstrate the existence of sharp resonant features and bound states in the continuum (BICs) in the reflectance and the transmittance spectra occurring at oblique incidence of a TE-polarized guided mode on the ridge. Using the effective index method, we explain the resonances by the excitation of the cross-polarized modes of the ridge. The formation of the BICs is confirmed using a theoretical model based on the coupled-wave theory. The model suggests that the BICs occur due to coupling of quasi-TE and quasi-TM modes of the structure. Simple analytical expressions for the angle of incidence and the ridge width predicting the location of the BICs are obtained. The existence of high-Q resonances and BICs makes the considered integrated structure promising for filtering, sensing, transformation of optical signals, and enhancing nonlinear light-matter interactions.

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“…(18) lie on the "resonant" curves |R| = 1; this can be shown by direct substitution into Eq. (8). These point are shown with black crosses in Fig.…”

Section: Comparison With the Rigorous Simulationsmentioning

confidence: 88%

“…The white circles predict the BIC locations, whereas the black crosses correspond to the "low-Q" resonances. (b) The model reflectance spectrum |R| 2 calculated using Eq (8)…”

mentioning

confidence: 99%

Bound states in the continuum and high-Q resonances supported by a dielectric ridge on a slab waveguide

Bezus¹,

Bykov²,

Doskolovich³

2018

Photon. Res.

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“…However, at relatively large angles of incidence, all these "parasitic" non-guided waves become evanescent and do not carry energy. We present a brief discussion of this scattering cancellation mechanism in Supplement 1; several integrated nanophotonic elements exploiting this phenomenon were recently proposed in [13,[31][32][33][34].…”

Section: Integrated Gires-tournois Interferometermentioning

confidence: 99%

Bound states in the continuum and strong phase resonances in integrated Gires-Tournois interferometer

2020

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Photonic bound states in the continuum (BICs) are eigenmodes with an infinite lifetime, which coexist with a continuous spectrum of radiating waves. BICs are not only of great theoretical interest, but have a wide range of practical applications, e.g. in the design of optical resonators. Here, we study this phenomenon in a new integrated nanophotonic element consisting of a single dielectric ridge terminating an abruptly ended slab waveguide. This structure can be considered as an on-chip analogue of the Gires-Tournois interferometer (GTI). We demonstrate that, in contrast to the conventional GTI, the proposed integrated structure supports high-Q phase resonances and "conditional" BICs. We develop a simple but extremely accurate coupled-wave model, which clarifies the physics of the BIC formation and enables predicting their locations. We show that the studied BICs are topologically protected and, for the first time, investigate the strong phase resonance effect, which occurs when two BICs with opposite topological charges annihilate.

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“…Spectral filters that selectively reflect or transmit the incident light are indispensable in various optical devices including spectrum analyzers, image sensors and wavelength demultiplexers. In a wide class of planar (integrated) optoelectronic systems, spectral or spatial filtering is performed in a slab waveguide [1][2][3][4][5][6][7]. Such geometry corresponds to the "insulator-oninsulator" platform and is suitable for the creation of fully integrated optical devices.…”

Section: Introductionmentioning

confidence: 99%

Integrated flat-top reflection filters operating near bound states in the continuum

Doskolovich¹,

Bezus²,

Bykov³

2019

Photon. Res.

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We propose and theoretically and numerically investigate narrowband integrated filters consisting of identical resonant dielectric ridges on the surface of a single-mode dielectric slab waveguide. The proposed composite structures operate near a bound state in the continuum (BIC) and enable spectral filtering of transverse-electric-polarized guided modes propagating in the waveguide. We demonstrate that by proper choice of the distances between the ridges, flat-top reflectance profiles with steep slopes and virtually no sidelobes can be obtained using just a few ridges. In particular, the structure consisting of two ridges can optically implement the second-order Butterworth filter, whereas at a larger number of ridges, excellent approximations to higher-order Butterworth filters can be achieved. Owing to the BIC supported by the ridges constituting the composite structure, the flat-top reflection band can be made arbitrarily narrow without increasing the structure size. In addition to the filtering properties, the investigated structures support another type of BICs -Fabry-Pérot BICs arising when the distances between the adjacent ridges meet the Fabry-Pérot resonance condition. In the vicinity of the Fabry-Pérot BICs, an effect similar to the electromagnetically induced transparency is observed, namely, sharp transmittance peaks against the background of a wide transmittance dip.

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Two-groove narrowband transmission filter integrated into a slab waveguide

Cited by 31 publications

References 26 publications

Bound states in the continuum and high-Q resonances supported by a dielectric ridge on a slab waveguide

Bound states in the continuum and high-Q resonances supported by a dielectric ridge on a slab waveguide

Bound states in the continuum and strong phase resonances in integrated Gires-Tournois interferometer

Integrated flat-top reflection filters operating near bound states in the continuum

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