Measurement of bound states in the continuum by a detector embedded in a photonic crystal

Gansch, Roman; Kalchmair, S.; Genevet, Patrice; Zederbauer, Tobias; Detz, Hermann; Andrews, A. M.; Schrenk, W.; Capasso, Federico; Lončar, Marko; Strasser, G.

doi:10.1038/lsa.2016.147

Cited by 92 publications

(83 citation statements)

References 36 publications

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“…3d,e). The quality factor can be determined through the reflectivity spectrum 132 , or through photocurrent spectrum by embedding a detector in the slab 133 . Such BICs also exist in a linear periodic array of rectangles 134,135 , cylinders 136 , or spheres 137 , and related BICs have been found in time-periodic systems 138 .…”

Section: Single Resonancementioning

confidence: 99%

Bound states in the continuum

et al. 2016

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Bound states in the continuum are waves that, defying conventional wisdom, remain localized even though they coexist with a continuous spectrum of radiating waves that can carry energy away. Their existence was first proposed in quantum mechanics and, being a general wave phenomenon, later identified in electromagnetic, acoustic, and water waves. They have been studied in a wide variety of material systems such as photonic crystals, optical waveguides and fibers, piezoelectric materials, quantum dots, graphene, and topological insulators. This Review describes recent developments in this field with an emphasis on the physical mechanisms that lead to these unusual states across the seemingly very different platforms. We discuss recent experimental realizations, existing applications, and directions for future work.

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Section: Single Resonancementioning

confidence: 99%

Bound states in the continuum

et al. 2016

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“…Second, the system can be tailored to support so-called bound states in the radiation continuum (BICs) [also known as embedded eigenstates (EEs)], which are essentially radiationless modes of an open system [188]- [191]. In the complex plane, BICs are associated with the coalescence of the zero and pole at the real frequency axis, and hence support an unbounded Q-factor and an infinitesimal linewidth in scattering experiments [54], [192], [193]. If material losses are small or even absent, a small amount of gain turns the BIC into the lasing regime, which makes it promising for ultralow threshold lasers [194]- [196].…”

Section: Different Scenarios In Gain/loss Systemsmentioning

confidence: 99%

Active Nanophotonics

Krasnok

Alù

2020

Proc. IEEE

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Recent progress in nanofabrication has led to tremendous technological developments in nanophotonics, which rely on the interaction of light with nanostructured matter. Nanophotonics has experienced a large surge of interest in recent years, from basic research to applied technology.The increased importance of extremely low-energy data processing at ultra-fast speeds has been encouraging the use of light for signal transport and processing. Energy demands and interaction time scales become smaller with the physical size of the nanostructures, hence nanophotonics opens the opportunity of integrating a large number of devices that can generate, control, modulate, sense and process light signals at ultrafast speeds and below femtojoule/bit energy levels.However, losses and diffraction pose fundamental challenges to the fundamental ability of nanophotonic structures to confine light efficiently in smaller and smaller volumes. In this framework, active nanophotonics, which combines the latest advances in nanotechnology with gain materials, has become in recent years a vital area of optics research, both from the physics, material science, and engineering standpoint. In this paper, we review recent efforts in enabling active nanodevices for lasing and optical sources, loss compensation, and to realize new optical functionalities, like -symmetry, exceptional points and nontrivial lasing based on suitably engineered distributions of gain and loss in nanostructures.

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“…A particularly simple structure supporting BICs is a slab waveguide with anisotropic core and substrate [11,12]. Many recent works are concerned with BICs on periodic structures, including two-dimensional (2D) structures with one periodic direction [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], threedimensional (3D) biperiodic structures [28][29][30][31][32][33][34][35][36][37], and 3D rotationally symmetric structures [38,39]. In these studies, the periodic structures are sandwiched between or surrounded by homogeneous media, the BICs are guided Bloch modes above the lightline, and the radiative waves are propagating plane waves in the homogeneous media.…”

Section: Introductionmentioning

confidence: 99%

Bound states with complex frequencies near the continuum on lossy periodic structures

Zhen

Yuan

2020

Phys. Rev. A

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On a lossless periodic dielectric structure sandwiched between two homogeneous media, bound states in the continuum (BICs) with real frequencies and real Bloch wavevectors may exist, and they decay exponentially in the surrounding homogeneous media and do not couple with propagating plane waves with the same frequencies and wavevectors. The BICs are of significant current interest, because they give rise to high-Q resonances when the structure or the Bloch wavevector is slightly perturbed. In this paper, the effect of a small material loss on the BICs is analyzed by a perturbation method and illustrated by numerical results. It is shown that bound states with complex frequencies near the continuum appear, but they behave differently depending on whether the BIC is symmetryprotected or not. The Bloch wavevector of a bound state with a complex frequency can be real if the original BIC is symmetry-protected, and it is usually complex if the original BIC is not symmetryprotected. Our study improves the theoretical understanding on BICs and provides useful insight for their practical applications.

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Measurement of bound states in the continuum by a detector embedded in a photonic crystal

Cited by 92 publications

References 36 publications

Bound states in the continuum

Bound states in the continuum

Active Nanophotonics

Bound states with complex frequencies near the continuum on lossy periodic structures

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