Unidirectional emission from a 
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-symmetric annular microcavity

Zhu, Danli; Liu, Shuai; Fan, Ruiqin; Xiao, Shumin; Song, Qinghai

doi:10.1103/physreva.99.033849

Cited by 5 publications

(1 citation statement)

References 48 publications

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“…Moreover, the higher-order Exceptional points (EP) [11] and Parity Time (PT) symmetric systems with alternating Gain and Loss [12][13][14][15][16] have been studied recently which can be implemented for control of non-Hermitian multi-Fano interference. Some of the Fano resonance applications include the new linear and nonlinear dielectric nanoresonators and 2D materials [17][18][19], slow light optomechanical nanocavities [20], Dirac semiconductors with ultrafast dynamics of phase and topology [21], Fano-lasers and spacers [22,23], While its substantial sensitivity to geometrical and environmental changes makes it the cornerstone of efficient sensors, it also renders the practical realization of Fano-based extremely systems extremely challenging.…”

Section: Introductionmentioning

confidence: 99%

Deterministic relation between thermal-phonon dressings and Non-Hermitian multi-Fano interferences in ion-doped microcrystals

Fan¹,

Raza²,

Mujahid³

et al. 2023

Preprint

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We report the multi-Fano interference obtained through the simultaneous acquisition of bright and dark states in different phase transitions of Eu3+: BiPO4 (7:1, 6:1, 1:1, and 0.5:1) and Eu3+: NaYF4 (1:1/4) crystals. We employ multi-dressed spontaneous four-wave mixing and multi-dressed fluorescence (multi-order) to optimize the strong photon-phonon nested dressing effect resulting in more obvious multi-Fano interference. Firstly, the multi-Fano is produced through interference in continuous and multi-bound states. Secondly, five multi-Fano dips originate from nested five dressings (one photon and four phonons) under symmetrical splitting of 7F1 energy level. We depict that the pure H-phase (0.5:1) sample exhibits the strongest photon-phonon dressed effect (five Fano dips). Further, we investigate high-order non-Hermitian exceptional points in multi-Fano interference by adjusting the ratio of Rabi-frequency to de-phase rate through nested photon and phonon dressing. Our experimental results are validated by theoretical simulations, which may be applied to designing optoelectronic devices such as multi-channel routers.

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Section: Introductionmentioning

confidence: 99%

Deterministic relation between thermal-phonon dressings and Non-Hermitian multi-Fano interferences in ion-doped microcrystals

Fan¹,

Raza²,

Mujahid³

et al. 2023

Preprint

View full text Add to dashboard Cite

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All‐Optical Modulation of Microcavity Emission by Parity‐Time Symmetry

Zhang

Song

et al. 2020

Annalen der Physik

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Integration of microcavity‐based coherent light sources and waveguides is of central importance for building optical networks and photonic circuits. However, such combined devices face severe challenges in distributing the generated signals to designed ends despite that the significant advances are accomplished in emission modulation and controlling. Herein, dynamically all‐optical control of the outputs from the microcavity by employing parity‐time (PT) symmetry is demonstrated. By exploiting the interplay between gain and loss in a waveguide‐connected microsquare cavity, the mode field distributions can be strongly modified when the non‐Hermitian system enters PT‐symmetry breaking phase. Numerical calculations and the corresponding Husimi projections unambiguously show the PT‐symmetry‐induced mode localization and output redistributions in microsquare cavity. Notably, the intensity ratios of the lights collected by the two channels can be directly tuned over two orders of magnitude with the increase of pumping strength. These findings will be essential for understanding the fundamentals of non‐Hermitian optics and advancing the application potentials of microcavity system in integrated photonics.

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