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Open accessJournal ArticleDOI: 10.1021/ACSPHOTONICS.0C01696

Capturing Broadband Light in a Compact Bound State in the Continuum

04 Mar 2021-ACS Photonics (American Chemical Society (ACS))-Vol. 8, Iss: 3, pp 813-823
Abstract: Trapping and storing light for arbitrary time lengths in open cavities is a major goal of nanophotonics, with potential applications ranging from energy harvesting to optical information processing...

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Topics: Continuum (topology) (56%), Nanophotonics (55%), Optical cavity (52%)
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9 results found


Open accessJournal ArticleDOI: 10.1063/5.0048937
25 May 2021-APL Materials
Abstract: Optical materials are undergoing revolutionary transformations driven by nanotechnology. Our ability to engineer structures at a scale smaller than the wavelength of light enables new properties and functionalities otherwise not available in natural bulk optical materials. A class of such components—dielectric metasurfaces—employs two-dimensional arrays of designer resonant nanoscale elements whose optical response is defined by their geometry. While linear regimes of interactions between dielectric metasurfaces and moderately intense light have already formed a mature field of applied research and engineering, new frontiers are being actively explored in the nonlinear optical regime describing interactions of metasurfaces with strong optical fields. In this Research Update, we cover the most recent progress along with several directions of research within the field of nonlinear optics of dielectric metasurfaces. Specifically, we review approaches to design and fabricate metasurfaces with high local field enhancements that facilitate nonlinear light–matter interactions, outline nonlinearity-enabled functionalities of dielectric metasurfaces, explore resonant metasurfaces in the strong-field non-perturbative regime, and discuss the implications of the time-variant refractive index in metasurfaces that interact with strong optical fields produced by laser pulses.

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6 Citations


Open accessJournal ArticleDOI: 10.1103/PHYSREVLETT.127.153903
Abstract: Temporal interfaces introduced by abrupt switching of the constitutive parameters of unbounded media enable unusual wave phenomena. So far, their explorations have been mostly limited to lossless media. Yet, non-Hermitian phenomena leveraging material loss and gain, and their balanced combination in parity-time (PT)-symmetric systems, have been opening new vistas in photonics. Here, we unveil the role that temporal interfaces offer in non-Hermitian physics, introducing the dual of PT symmetry for temporal boundaries. Our findings reveal unexplored interference mechanisms enabling extreme energy manipulation, and open new scenarios for time-switched metamaterials, connecting them with the broad opportunities offered by non-Hermitian phenomena.

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3 Citations


Open accessJournal ArticleDOI: 10.1515/NANOPH-2021-0367
Luca Carletti1, Marco Gandolfi1, Davide Rocco1, Andrea Tognazzi1  +3 moreInstitutions (1)
20 Oct 2021-Nanophotonics
Topics: Nonlinear optics (61%), Second-harmonic generation (55%), Nanophotonics (53%) ... read more

1 Citations


Open accessPosted Content
19 Apr 2021-arXiv: Optics
Abstract: In the last decade, symmetry-protected bound states in the continuum (BICs) have proven to be an important design principle for creating and enhancing devices reliant upon states with high quality (Q) factors, such as sensors, lasers, and those for harmonic generation. However, as we show, current implementations of symmetry-protected BICs in photonic crystal slabs can only be found at the center of the Brillouin zone and below the Bragg-diffraction limit, which fundamentally restricts their use to single-frequency applications. By 3D-micro printing a photonic crystal structure using two-photon polymerization, we demonstrate that this limitation can be overcome by altering the radiative environment surrounding the slab to be a three-dimensional photonic crystal. This allows for the protection of a line of BICs by embedding it in a symmetry bandgap of the crystal. Moreover, we experimentally verify that just a single layer of this photonic crystal environment is sufficient. This concept significantly expands the design freedom available for developing next-generation devices with high-Q states.

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Topics: Photonic crystal (60%)

Open accessPosted Content
26 Jul 2021-arXiv: Optics
Abstract: Temporal interfaces introduced by abrupt switching of the constitutive parameters of unbounded media enable unusual wave phenomena. So far, their explorations have been mostly limited to lossless media. Yet, non-Hermitian phenomena leveraging material loss and gain, and their balanced combination in parity-time (PT)-symmetric systems, have been opening new vistas in photonics. Here, we unveil the role that temporal interfaces offer in non-Hermitian physics, introducing the dual of PT symmetry for temporal boundaries. Our findings reveal unexplored interference mechanisms enabling extreme energy manipulation, and open new scenarios for time-switched metamaterials, connecting them with the broad opportunities offered by non-Hermitian phenomena.

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67 results found


Journal ArticleDOI: 10.1364/JOSAA.20.000569
Abstract: We present a theory of the Fano resonance for optical resonators, based on a temporal coupled-mode formalism. This theory is applicable to the general scheme of a single optical resonance coupled with multiple input and output ports. We show that the coupling constants in such a theory are strongly constrained by energy-conservation and time-reversal symmetry considerations. In particular, for a two-port symmetric structure, Fano-resonant line shape can be derived by using only these symmetry considerations. We validate the analysis by comparing the theoretical predictions with three-dimensional finite-difference time-domain simulations of guided resonance in photonic crystal slabs. Such a theory may prove to be useful for response-function synthesis in filter and sensor applications.

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Topics: Coupled mode theory (67%), Fano resonance (62%), Photonic crystal (52%) ... read more

972 Citations


Open accessJournal ArticleDOI: 10.1038/NATREVMATS.2016.48
Chia Wei Hsu1, Bo Zhen2, Bo Zhen3, A. Douglas Stone1  +2 moreInstitutions (3)
Abstract: Bound states in the continuum (BICs) are waves that remain localized even though they coexist with a continuous spectrum of radiating waves that can carry energy away. Their very existence defies conventional wisdom. Although BICs were first proposed in quantum mechanics, they are a general wave phenomenon and have since been identified in electromagnetic waves, acoustic waves in air, water waves and elastic waves in solids. These states have been studied in a wide range of material systems, such as piezoelectric materials, dielectric photonic crystals, optical waveguides and fibres, quantum dots, graphene and topological insulators. In this Review, we describe recent developments in this field with an emphasis on the physical mechanisms that lead to BICs across seemingly very different materials and types of waves. We also discuss experimental realizations, existing applications and directions for future work. The fascinating wave phenomenon of ‘bound states in the continuum’ spans different material and wave systems, including electron, electromagnetic and mechanical waves. In this Review, we focus on the common physical mechanisms underlying these bound states, whilst also discussing recent experimental realizations, current applications and future opportunities for research.

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Topics: Mechanical wave (61%), Acoustic wave (54%)

954 Citations


Open accessJournal ArticleDOI: 10.1038/NATURE12289
Chia Wei Hsu1, Bo Zhen1, Jeongwon Lee1, Song-Liang Chua1  +3 moreInstitutions (1)
06 Oct 2013-Nature
Abstract: United States. Army Research Office (Institute for Soldier Nanotechnologies under contract no. W911NF-07-D0004)

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646 Citations


Journal ArticleDOI: 10.1126/SCIENCE.AAE0330
M. Zahirul Alam1, Israel De Leon2, Israel De Leon1, Robert W. Boyd3  +1 moreInstitutions (3)
13 May 2016-Science
Abstract: Nonlinear optical phenomena are crucial for a broad range of applications, such as microscopy, all-optical data processing, and quantum information. However, materials usually exhibit a weak optical nonlinearity even under intense coherent illumination. We report that indium tin oxide can acquire an ultrafast and large intensity-dependent refractive index in the region of the spectrum where the real part of its permittivity vanishes. We observe a change in the real part of the refractive index of 0.72 ± 0.025, corresponding to 170% of the linear refractive index. This change in refractive index is reversible with a recovery time of about 360 femtoseconds. Our results offer the possibility of designing material structures with large ultrafast nonlinearity for applications in nanophotonics.

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Topics: Refractive index (55%), Indium tin oxide (53%), Nanophotonics (52%)

550 Citations


Open accessJournal ArticleDOI: 10.1103/PHYSREVLETT.92.083901
Mehmet Fatih Yanik1, Shanhui Fan1Institutions (1)
Abstract: We show that light pulses can be stopped and stored coherently, with an all-optical adiabatic and reversible pulse bandwidth compression process. Such a process overcomes the fundamental bandwidth-delay constraint in optics and can generate arbitrarily small group velocities for any light pulse with a given bandwidth, without any coherent or resonant light-matter interactions. We exhibit this process in optical resonators, where the bandwidth compression is accomplished only by small refractive-index modulations performed at moderate speeds.

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548 Citations


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