Unidirectional light emission in PT-symmetric microring lasers

Ren, Jinhan; Liu, Yuzhou G. N.; Parto, Midya; Hayenga, William E.; Hokmabadi, Mohammad P.; Christodoulides, Demetrios N.; Khajavikhan, Mercedeh

doi:10.1364/oe.26.027153

Cited by 48 publications

(39 citation statements)

References 26 publications

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“…The asymmetric coupling between the two traveling modes with designed structures has been proposed in Refs. [5, 31, 45]. We will show later that this unique coupling directly renders the system to be maintained at an EP without any additional requirements.…”

Section: Resultsmentioning

confidence: 97%

Experimental Realization of Sensitivity Enhancement and Suppression with Exceptional Surfaces

Gan

Xie

Zhang

et al. 2021

Laser & Photonics Reviews

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By preparing a sensor system around isolated exceptional points, one can obtain a great enhancement of the sensitivity benefiting from the non‐Hermiticity. However, this comes at the cost of reduction of the flexibility of the system, which is critical for practical applications. By generalizing the exceptional points to exceptional surfaces, it has been theoretically proposed recently that enhanced sensitivity and flexibility can be combined. Here, an exceptional surface is experimentally demonstrated in a non‐Hermitian photonic sensing system, which is composed of a whispering‐gallery‐mode microresonator and two nanofiber waveguides, resulting in a unidirectional coupling between two degenerate counter‐propagating modes with an external optical isolator. The system is simple, robust, and can be easily operated around an exceptional surface. On the one hand, sensitivity enhancement is observed by monitoring the resonant frequency splitting caused by small perturbations. This demonstration of exceptional‐surface‐enhanced sensitivity paves the way for practical non‐Hermitian sensing applications. On the other hand, the suppression of frequency splitting around the exceptional surface is also shown for the first time.

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Section: Resultsmentioning

confidence: 97%

Experimental Realization of Sensitivity Enhancement and Suppression with Exceptional Surfaces

Gan

Xie

Zhang

et al. 2021

Laser & Photonics Reviews

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show abstract

“…In this latter case, an amplified response could be measured in the spectral splitting of the device. The exceptional surfaces mentioned here are also known to arise in other photonic arrangements such as three-dimensional (3D) PT-symmetric photonic crystals [71,128].…”

Section: Enhancement Effects Around Epsmentioning

confidence: 83%

“…This precludes a direct generation of a vortex beam with nonzero topological charge since the two opposite azimuthal mode numbers tend to cancel each other. NH schemes based on EPs have recently provided an elegant method to selectively extract only one chiral mode in such lasers [52,[60][61][62][63][64][65][66][67][68][69][70][71][72]. This class of devices can emit in a tunable OAM order while operating in a broadband fashion.…”

Section: Lasers and Non-hermitian Symmetry Breakingmentioning

confidence: 99%

Non-Hermitian and topological photonics: optics at an exceptional point

et al. 2020

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In the past few years, concepts from non-Hermitian (NH) physics, originally developed within the context of quantum field theories, have been successfully deployed over a wide range of physical settings where wave dynamics are known to play a key role. In optics, a special class of NH Hamiltonians – which respects parity-time symmetry – has been intensely pursued along several fronts. What makes this family of systems so intriguing is the prospect of phase transitions and NH singularities that can in turn lead to a plethora of counterintuitive phenomena. Quite recently, these ideas have permeated several other fields of science and technology in a quest to achieve new behaviors and functionalities in nonconservative environments that would have otherwise been impossible in standard Hermitian arrangements. Here, we provide an overview of recent advancements in these emerging fields, with emphasis on photonic NH platforms, exceptional point dynamics, and the very promising interplay between non-Hermiticity and topological physics.

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“…counter-propagating degenerate modes that couple to each other through scatterings or imperfections. If unidirectional lasing is required by the application, several technological strategies that are compatible with the structure of these lasers could be used, such as the definition of crossover S-bend waveguides in the ring cavity [24].…”

Section: Device Resultsmentioning

confidence: 99%

Vertically coupled InP/InGaAsP microring lasers using a single epitaxial growth and single-side lithography

López

Thourhout

Verstuyft

et al. 2020

J. Lightwave Technol.

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The experimental demonstration of vertical microring lasers requiring only one single epitaxial growth and two single-side lithographic steps is presented, in what is the simplest fabrication scheme for such devices published to date. The fabricated lasers show series resistance of around 20 Ω at forward bias, threshold currents at room temperature between 35 and 58 mA, and single-mode emission with a side-lobe suppression ratio higher than 30 dB. The measured optic output power level is of tens of microwatts. The approach allows the improvement of the optical features maintaining the simplicity of the manufacturing procedure.

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Unidirectional light emission in PT-symmetric microring lasers

Cited by 48 publications

References 26 publications

Experimental Realization of Sensitivity Enhancement and Suppression with Exceptional Surfaces

Experimental Realization of Sensitivity Enhancement and Suppression with Exceptional Surfaces

Non-Hermitian and topological photonics: optics at an exceptional point

Vertically coupled InP/InGaAsP microring lasers using a single epitaxial growth and single-side lithography

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