Transition from Optical Bound States in the Continuum to Leaky Resonances: Role of Substrate and Roughness

Sadrieva, Z. F.; Sinev, Ivan S.; Koshelev, Kirill; Samusev, A. K.; Iorsh, I. V.; Takayama, Osamu; Malureanu, Radu; Bogdanov, Andrey; Lavrinenko, Andrei V.

doi:10.1021/acsphotonics.6b00860

Cited by 266 publications

(194 citation statements)

References 42 publications

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“…Later on the symmetry protected BICs were reported in a cross-wire waveguide 3 and a quantum dot subject to magnetic field 4 . Nowadays we witness a surge of interest to BICs in field of photonics, where BICs were observed in various set-ups with periodical dielectric permittivity [5][6][7][8][9][10] . In particular, the studies on BICs are motivated by applications to resonant light enhancement [11][12][13] and lasing 14,15 .…”

Section: Introductionmentioning

confidence: 99%

Optical defect mode with tunableQfactor in a one-dimensional anisotropic photonic crystal

2018

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We consider a one-dimensional photonic crystal composed of alternating layers of isotropic and anisotropic dielectric materials. Such a system has different band structures for different polarizations of light. We demonstrate that if an anisotropic defect layer is inserted into the structure, the crystal can support an optical bound state in the continuum. By tilting the principle dielectric axes of the defect layer relative to those of the photonic crystal we observe a long-lived resonance in the transmission spectrum. We derive an analytical expression for the decay rate of the resonance that agrees well with the numerical data by the Berreman anisotropic transfer matrix approach. An experimental set-up with a liquid crystal defect layer is proposed to tune the Q-factor of the resonance through applying an external electric field. We speculate that the set-up provides a simple and robust platform for observing optical bound states in the continuum in the form of resonances with tunable Q-factor.

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Section: Introductionmentioning

confidence: 99%

Optical defect mode with tunableQfactor in a one-dimensional anisotropic photonic crystal

2018

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“…The guided quasi‐TM mode can leak into this silicon substrate if the SiO 2 cladding layer is not thick enough. However, 3 µm SiO 2 layer is sufficiently thick to make the leakage into the substrate negligible comparing with the scattering loss . Therefore, the maximum Q factor that can be achieved at the “magic” widths is limited by the scattering loss due to surface roughness provided that a very broad TE beam can be generated.…”

Section: Resultsmentioning

confidence: 99%

Ridge Resonance in Silicon Photonics Harnessing Bound States in the Continuum

Nguyen

Ren

Schoenhardt

et al. 2019

Laser & Photonics Reviews

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The theoretical analysis and experimental demonstration of a waveguide resonator are presented based on bound states in the continuum in an integrated photonic chip platform. The continuum has the form of a collimated beam of light which is confined vertically in a transverse electric (TE) mode of a silicon slab. The bound state is a discrete transverse‐magnetic (TM)‐like mode of a ridge on the silicon slab. The coupling between the slab and ridge modes results in a single sharp resonance at the wavelength where they phase match. This phenomenon is experimentally demonstrated on a silicon photonic chip using foundry‐compatible parameters and it is interfaced on‐chip to standard single‐mode silicon nanowire waveguides. The fabricated chip exhibits a single sharp resonance near 1550 nm with a line width of a few nanometers, an extinction ratio of 25 dB, and a thermal stability of 19.5 pm °C−1. It is believed that the demonstration of a resonance operating near a bound state in the continuum realized using guided wave components will form the basis of a new approach to on‐chip wavelength filtering and sensing applications.

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“…Here ω 1 and ω 2 correspond to either TM 0 (TE 0 ) or TM 1 (TE 1 ) for the P (S)-wave case. We evaluated a 1 and a 2 from the electric field using equation (24). The electric field of the coupled resonant modes can be obtained numerically by searching for the electromagnetic wave solution in the absence of the incident wave using SCMT.…”

Section: Evaluation Of αmentioning

confidence: 99%

Polarization-based branch selection of bound states in the continuum in dielectric waveguide modes anti-crossed by a metal grating

2019

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We investigate bound states in the continuum (BICs) in a planar dielectric waveguide structure consisting of a gold grating on a dielectric layer with a back layer of metal. In this structure, Friedrich-Wintgen (FW) BICs caused by the destructive interference between the radiations from two waveguide modes appear near the anti-crossing point of the dispersion curves. In this study, it is revealed that the branch at which the BIC appears changes according to the polarization of the modes. Based on a temporal coupled mode theory, it is shown that the BIC branch is determined by the sign of the product of the coupling coefficients between the two waveguide modes and external radiation, which is consistent with FW theory. The signs of the coupling coefficients are estimated by the waveguidemode decomposition of the numerically obtained electric fields and are confirmed to vary depending on the polarization.

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Transition from Optical Bound States in the Continuum to Leaky Resonances: Role of Substrate and Roughness

Cited by 266 publications

References 42 publications

Optical defect mode with tunableQfactor in a one-dimensional anisotropic photonic crystal

Optical defect mode with tunableQfactor in a one-dimensional anisotropic photonic crystal

Ridge Resonance in Silicon Photonics Harnessing Bound States in the Continuum

Polarization-based branch selection of bound states in the continuum in dielectric waveguide modes anti-crossed by a metal grating

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