Integrable and steerable vortex lasers using bound states in the continuum

Contractor, Rushin; Bahari, Babak; Vallini, Felipe; Lepetit, Thomas; Tellez-Limon, Ricardo; Park, J. H.; Kodigala, Ashok; Fainman, Yeshaiahu; Boubacar, Kante

doi:10.1364/fio.2019.jtu3a.113

Cited by 2 publications

(2 citation statements)

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“…One of the major drivers in the fields of optics and photonics is the realization and investigation of systems supporting high-quality (high-Q) electromagnetic resonances. These investigations are motivated by fundamental phenomena, such as light–matter interaction, nonlinear optics, ultrastrong coupling, or optical switching as well as by potential applications, such as optical sensing, storage, low threshold lasing, or frequency and polarization filtering. − The quality of a resonator is inherently limited by the losses in the system, which have two possible sources: intrinsic material losses or the absorption of the electromagnetic (EM) wave and radiation leakage of the EM energy out of the system. The first source of loss can be suppressed or minimized by using materials with no or weak absorption at the resonant frequency (e.g., dielectrics at optical frequencies and/or noble metals at low frequencies).…”

Section: Introductionmentioning

confidence: 99%

“…The arrangement of these structures in a photonic lattice can tailor their radiation properties to enhance the scattering in certain directions. These enhanced differential scattering cross sections by interference of the scattered waves is the mechanism leading to applications such as antenna arrays and beam shaping. , The recent discovery that arrays of similar resonant dipolar scatterers can also fully suppress all radiation channels and support symmetry-protected BICs has opened the possibility of realizing ultrahigh Q resonances in extended open cavities of scatterers. ,, …”

Section: Introductionmentioning

confidence: 99%

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Unveiling the Symmetry Protection of Bound States in the Continuum with Terahertz Near-Field Imaging

et al. 2021

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Bound states in the continuum (BICs) represent a new paradigm in photonics due to the full suppression of radiation losses. However, this suppression has also hampered the direct observation of them. By using a double terahertz (THz) near-field technique that allows the local excitation and detection of the THz amplitude, we are able to map for the first time the electromagnetic field amplitude and phase of BICs over extended areas, unveiling the field-symmetry protection that suppresses the far-field radiation. This investigation, done for metasurfaces of dimer scatterers, reveals the in-plane extension and formation of BICs with antisymmetric phases, in agreement with coupled-dipole calculations. By displacing the scatterers, we show experimentally that a mirror symmetry is not a necessary condition for a BIC formation. Only π-rotation symmetry is required, making BICs exceptionally robust to structural changes. This work makes the local field of BICs experimentally accessible, which is crucial for the engineering of cavities with infinite lifetimes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unveiling the Symmetry Protection of Bound States in the Continuum with Terahertz Near-Field Imaging

et al. 2021

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Bound states in the continuum in resonant nanostructures: an overview of engineered materials for tailored applications

et al. 2021

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From theoretical model to experimental realization, the bound state in the continuum (BIC) is an emerging area of research interest in the last decade. In the initial years, well-established theoretical frameworks explained the underlying physics for optical BIC modes excited in various symmetrical configurations. Eventually, in the last couple of years, optical-BICs were exploited as a promising tool for experimental realization with advanced nanofabrication techniques for numerous breakthrough applications. Here, we present a review of the evolution of BIC modes in various symmetry and functioning mediums along with their application. More specifically, depending upon the nature of the interacting medium, the excitations of BIC modes are classified into the pure dielectric and lossy plasmonic BICs. The dielectric constituents are again classified as photonic crystal functioning in the subwavelength regime, influenced by the diffraction modes and metasurfaces for interactions far from the diffraction regime. More importantly, engineered functional materials evolved with the pure dielectric medium are explored for hybrid-quasi-BIC modes with huge-quality factors, exhibiting a promising approach to trigger the nanoscale phenomena more efficiently. Similarly, hybrid modes instigated by the photonic and plasmonic constituents can replace the high dissipative losses of metallic components, sustaining the high localization of field and high figure of merit. Further, the discussions are based on the applications of the localized BIC modes and high-quality quasi-BIC resonance traits in the nonlinear harmonic generation, refractometric sensing, imaging, lasing, nanocavities, low loss on-chip communication, and as a photodetector. The topology-controlled beam steering and, chiral sensing has also been briefly discussed.

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Integrable and steerable vortex lasers using bound states in the continuum

Cited by 2 publications

References 1 publication

Unveiling the Symmetry Protection of Bound States in the Continuum with Terahertz Near-Field Imaging

Unveiling the Symmetry Protection of Bound States in the Continuum with Terahertz Near-Field Imaging

Bound states in the continuum in resonant nanostructures: an overview of engineered materials for tailored applications

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