On-chip integrated exceptional surface microlaser

Liao, Kui; Zhong, Yangguang; Du, Zhuochen; Liu, Guodong; Li, Chentong; Wu, Xianxin; Deng, Chao; Lu, Cuicui; Wang, Xingyuan; Chan, Che Ting; Song, Qinghai; Wang, Shufeng; Liu, Xinfeng; Hu, Xiaoyong; Gong, Qihuang

doi:10.1126/sciadv.adf3470

Cited by 15 publications

(12 citation statements)

References 58 publications

(73 reference statements)

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“…[ 28 ] Its gain and absorption properties allow the non‐Hermitian symmetry breaking to occur effectively at very small scales, making it a new material for studying non‐Hermitian photonics. [ 29,30 ] The non‐Hermitian laser array in this article is realized by patterned perovskite. Material synthesis and FIB structure processing detail are in the Section SI, Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

Supersymmetry Laser Arrays with High‐Order Exceptional Point

Liu

Duan

Yan

et al. 2023

Advanced Photonics Research

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Supersymmetry (SUSY) laser array with superpartner structure can suppress excess modes to achieve high‐intensity and high‐coherent radiation. Compared with complex superpartner, using parity time (PT) symmetry broken to manipulate SUSY laser arrays is a more flexible approach. Herein, based on ultrathin perovskite single crystal, a SUSY laser array is constructed without superpartner, but with auxiliary gain–loss structure. PT symmetry broken with high‐order exceptional point (EP) is realized in the visible spectral range. It intrinsically avoids superpartner field mismatch and improves side mode suppression ratio 8.8–12 dB for single‐mode lasing. Furthermore, variations in EP‐order enable the transition from single‐mode to dual‐mode or tri‐mode radiation and retain amplified radiation characteristics. In addition, these SUSY laser arrays with the high‐order EP have the potential to be small‐volume optical sensor devices. The new design combining SUSY and PT symmetry broken presents its potential in micro‐nanophotonic devices with the benefit of small size, flexibility in spectral control, expandability, simplicity, and multifunctionality feature.

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Section: Resultsmentioning

confidence: 99%

Supersymmetry Laser Arrays with High‐Order Exceptional Point

Liu

Duan

Yan

et al. 2023

Advanced Photonics Research

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“…Exceptional points (EPs) represent unique spectral singularities of non-Hermitian systems, at which the eigenvalues and their corresponding eigenstates coalesce (1)(2)(3)(4)(5). These degenerate points have been widely observed in diverse physical systems, spanning optical microcavities (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21), plasmonic metamaterials (22,23), photonic crystals (PhCs) (24,25), acoustics (26), electronics (27)(28)(29)(30)(31)(32), elastodynamics (33,34), and superconducting circuits (35). Notably, EPs have unlocked numerous intriguing phenomena in optical systems.…”

Section: Introductionmentioning

confidence: 99%

Exceptional–point–enhanced phase sensing

Mao,

Fu,

et al. 2024

Sci. Adv.

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Optical sensors, crucial in diverse fields like gravitational wave detection, biomedical imaging, and structural health monitoring, rely on optical phase to convey valuable information. Enhancing sensitivity is important for detecting weak signals. Exceptional points (EPs), identified in non-Hermitian systems, offer great potential for advanced sensors, given their marked response to perturbations. However, strict physical requirements for operating a sensor at EPs limit broader applications. Here, we introduce an EP-enhanced sensing platform featuring plug-in external sensors separated from an EP control unit. EPs are achieved without modifying the sensor, solely through control-unit adjustments. This configuration converts and amplifies optical phase changes into quantifiable spectral features. By separating sensing and control functions, we expand the applicability of EP enhancement to various conventional sensors. As a proof-of-concept, we demonstrate a sixfold reduction in the detection limit of fiber-optic strain sensing using this configuration. This work establishes a universal platform for applying EP enhancement to diverse phase-dependent structures, promising ultrahigh-sensitivity sensing across various applications.

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“…The ability of ring resonators to confine light and couple to other optical components make them a good platform to emulate effects in condensed matter physics, and construct artificial systems like topological photonic systems [14][15][16] and non-Hermitian systems. [17][18][19][20][21][22] In addition, the periodically repetitive circular mode profile inside the rings also makes them important in the field of singular optics. 23) When the symmetry of the ring is broken and lasing is achieved unidirectionally, beams with singularities are generated.…”

Section: Introductionmentioning

confidence: 99%

Rate equation analysis for deterministic and unidirectional lasing in ring resonators with an S-shaped coupler

Dai,

Lin,

Iwamoto

2024

Jpn. J. Appl. Phys.

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Ring resonators are traditionally popular optical devices that apply to various components in photonic integrated circuits. They also play an important role in the on-chip generation of many novel optical states in topological systems and non-Hermitian systems. Unidirectional lasing of ring resonators is used in many such systems to create exotic states of light including optical vortexes and optical skyrmions, but the unidirectional behavior has not been fully understood. Previous research has constructed a simplified model to explain the steady state behaviors of unidirectional ring resonators, but the carrier dynamics and spontaneous emission were omitted. In this work, we give a numerical analysis of unidirectional ring resonators with an S-shaped coupler. We identified the importance of the gain saturation to robustness against backscattering and high unidirectionality by comparing to the linear model without saturation. We also discuss the effect of amount of asymmetrical coupling to the realization of unidirectionality.

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On-chip integrated exceptional surface microlaser

Cited by 15 publications

References 58 publications

Supersymmetry Laser Arrays with High‐Order Exceptional Point

Supersymmetry Laser Arrays with High‐Order Exceptional Point

Exceptional–point–enhanced phase sensing

Rate equation analysis for deterministic and unidirectional lasing in ring resonators with an S-shaped coupler

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