Integrated and steerable vortex laser using bound states in continuum (Conference Presentation)

Bahari, Babak; Valini, Felipe; Lepetit, Thomas; Tellez-Limon, Ricardo; Park, Jun‐Hee; Kodigala, Ashok; Fainman, Yeshaiahu; Kanté, Boubacar

doi:10.1117/12.2290428

Cited by 7 publications

(12 citation statements)

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“…After the transition to the super-BIC regime, we measure the farfield laser image with strong angular confinement, the reduced threshold to~1.47 kW/cm 2 , and the increased Q factor up tõ 7300. The measured threshold peak power is approximately 50 to ten million times lower than that of earlier demonstrated BIC nanolasers [13][14][15][16][17][18][19] . Our study presents the direct observation of all the BIC lasers simultaneously and provides an efficient recipe to reduce the optical loss in active nanocavities with finite sizes.…”

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confidence: 69%

“…Thus, the measurement indicates that the lasing threshold is minimized by the transition to the super-BIC mode. We note that the threshold peak power of~340 μW and threshold power density of~14.7 μW/μm 2 at a = 574 nm are the smallest among all the BIC lasers previously reported (Supplementary Table 1) 5,[13][14][15][16][17][18][19]29 .…”

Section: Resultsmentioning

confidence: 99%

“…Thus far, symmetry-protected BICs and accidental BICs were observed successfully in Si 3 N 4 and Si photonic crystal slabs 11,12 . In addition, the lasing action was achieved for BIC cavities in a few recent experiments [13][14][15][16][17][18][19] . The BIC-enhanced feature of a reasonably low threshold was successfully demonstrated in a cavity with lattices of finite size 13 .…”

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confidence: 99%

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Ultralow-threshold laser using super-bound states in the continuum

et al. 2021

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Wavelength-scale lasers provide promising applications through low power consumption requiring for optical cavities with increased quality factors. Cavity radiative losses can be suppressed strongly in the regime of optical bound states in the continuum; however, a finite size of the resonator limits the performance of bound states in the continuum as cavity modes for active nanophotonic devices. Here, we employ the concept of a supercavity mode created by merging symmetry-protected and accidental bound states in the continuum in the momentum space, and realize an efficient laser based on a finite-size cavity with a small footprint. We trace the evolution of lasing properties before and after the merging point by varying the lattice spacing, and we reveal this laser demonstrates the significantly reduced threshold, substantially increased quality factor, and shrunken far-field images. Our results provide a route for nanolasers with reduced out-of-plane losses in finite-size active nanodevices and improved lasing characteristics.

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confidence: 69%

Section: Resultsmentioning

confidence: 99%

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confidence: 99%

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Ultralow-threshold laser using super-bound states in the continuum

et al. 2021

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“…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 . Another remarkable property of BICs is the emergence of a collapsing Fano feature in its parametric vicinity [16][17][18][19] , that can be potentially employed to narrow-band filters 20,21 .…”

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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“…Fibers with separable permittivity profiles have been suggested [32] but cannot be realized as exact values of permittivity need to be achieved. One way to realize BICs is by introducing large index modulations periodically along the propagation direction [18,21,22,[24][25][26][27][28][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]; longitudinal periodic Bragg gratings in fibers can be created by writing interference fringes onto a photosensitive core or by femtosecond laser writing [48][49][50][51][52][53][54][55], but the available grating index contrast Δ is much smaller (of the order of 10 −6~1 0 −2 ) [48,50,53] than those that are known to support BICs. Therefore, despite much interest, it remains an open question whether BICs can exist in realistic optical fiber structures.…”

Section: Introductionmentioning

confidence: 99%

Bound States in the Continuum in Fiber Bragg Gratings

et al. 2019

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Optical fibers typically confine light through total internal reflection or through photonic bandgaps. Here we show that light can be perfectly guided in optical fibers through a different mechanism based on bound states in the continuum (BICs). In fibers with periodic Bragg gratings, we predict bona fide BICs in purepolarization modes, as well as quasi-BICs in hybrid-polarization modes. These guided modes exist robustly without the need for fine structural tuning, and they persist even with the very small grating index contrasts that are available in conventional fiber Bragg gratings. The suppression of radiation loss arises from the coupling between a weakly-radiating mode and a strongly-radiating one. This finding opens the possibility of guiding light with BICs in optical fibers and their applications in distributed fiber sensors, in-line fiber filters, and high-power fiber lasers.

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Integrated and steerable vortex laser using bound states in continuum (Conference Presentation)

Cited by 7 publications

References 0 publications

Ultralow-threshold laser using super-bound states in the continuum

Ultralow-threshold laser using super-bound states in the continuum

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

Bound States in the Continuum in Fiber Bragg Gratings

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