Recent advances in coherent perfect absorber-lasers and their future applications

Yang, Minye; Ye, Zhi-lu; Zhu, Liang; Farhat, Mohamed; Chen, Pai‐Yen

doi:10.1007/s11771-022-5160-0

Cited by 4 publications

(2 citation statements)

References 109 publications

(81 reference statements)

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“…Moreover, the CPAL frequency shift due to air pressure applied to the incompressible medium can be quite sensitive, with sensitivity in the order of 10 4 Hz per unit mass density. Table 1 summarizes the performance, pros and cons of EP-based and CPAL-based sensors discussed above [132][133][134][135][136][137][138][139]. In general, high entropy near an EP may cause the EP-based sensors to suffer from flicker/phase noise, which in turn degrade the signal-to-noise ratio and the reliability of sensor.…”

Section: Coherent Perfect Absorber-laser-enabled Sensingmentioning

confidence: 99%

Recent Advances in Parity-time Symmetry-enabled Electromagnetic Sensors

Yang,

Ye,

Chen

et al. 2024

PIER B

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Parity-time (PT) reversal symmetry, as a representative example in the field of non-Hermitian physics, has attracted widespread research interest in the past few years due to its extraordinary wave dynamics. PT symmetry enables unique spectral singularities including the exceptional point (EP) degeneracy where two or more eigenvalues and eigenvectors coalesce, as well as the coherent perfect absorber-laser (CPAL) point where laser and its time-reversal counterpart (i.e., coherent perfect absorber) can coexist at the same frequency. These singular points not only give rise to new physical phenomena but also provide new plausibility for building the nextgeneration sensors and detectors with unprecedented sensitivity. To date, investigations into EPs and CPAL points have unveiled their great potential in various sensing scenarios across a broad spectral range, spanning optics, photonics, electronics, and acoustics. In this review article, we will discuss ongoing developments of EP-and CPAL-based sensors composed of PT-synthetic structures and offer a glimpse into the future research directions in this emerging field.

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Section: Coherent Perfect Absorber-laser-enabled Sensingmentioning

confidence: 99%

Recent Advances in Parity-time Symmetry-enabled Electromagnetic Sensors

Yang,

Ye,

Chen

et al. 2024

PIER B

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“…These unique characteristics can be exploited for coherent perfect absorber lasers (CPAL) and other applications [29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Advances in Semiconductor Lasers Based on Parity–Time Symmetry

Sha,

Song,

Chen

et al. 2024

Nanomaterials

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Semiconductor lasers, characterized by their high efficiency, small size, low weight, rich wavelength options, and direct electrical drive, have found widespread application in many fields, including military defense, medical aesthetics, industrial processing, and aerospace. The mode characteristics of lasers directly affect their output performance, including output power, beam quality, and spectral linewidth. Therefore, semiconductor lasers with high output power and beam quality are at the forefront of international research in semiconductor laser science. The novel parity–time (PT) symmetry mode-control method provides the ability to selectively modulate longitudinal modes to improve the spectral characteristics of lasers. Recently, it has gathered much attention for transverse modulation, enabling the output of fundamental transverse modes and improving the beam quality of lasers. This study begins with the basic principles of PT symmetry and provides a detailed introduction to the technical solutions and recent developments in single-mode semiconductor lasers based on PT symmetry. We categorize the different modulation methods, analyze their structures, and highlight their performance characteristics. Finally, this paper summarizes the research progress in PT-symmetric lasers and provides prospects for future development.

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Frequency tunable coherent perfect absorption and lasing in radio-frequency system for ultrahigh-sensitive sensing

Wu,

Li,

Zhang

et al. 2023

Applied Physics Letters

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A coherent perfect absorption-lasing (CPAL) point in non-Hermitian physics systems has infinite output amplitudes (or quality factor) theoretically and has been utilized for applications. However, practical implementation of CPAL systems faces extreme challenges because of the deviations of electronic components from ideal values, which makes it difficult to attain the CPAL state. Moreover, the amplitude-based output is easily interfered by noises or environments and is inferior as compared to frequency shift-based sensing. Through the investigation of the effects of component deviations on general CPAL systems, we propose an eigenstate tuning method specifically tailored for radio-frequency (RF) CPAL systems. The method enables the realization of CPAL states at any desired frequency with dynamic ranges of signal amplitudes exceeding 60 dB experimentally or to work at a frequency shift-based sensing. Then, a CPAL-based RF sensor system is developed for verification, showing an ultrahigh sensitivity of 1.9 dB/10 fF by measuring output coefficient variation or 9.4 MHz/pF by measuring frequency shift, significantly broadening the application scope of CPAL systems.

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Recent advances in coherent perfect absorber-lasers and their future applications

Cited by 4 publications

References 109 publications

Recent Advances in Parity-time Symmetry-enabled Electromagnetic Sensors

Recent Advances in Parity-time Symmetry-enabled Electromagnetic Sensors

Advances in Semiconductor Lasers Based on Parity–Time Symmetry

Frequency tunable coherent perfect absorption and lasing in radio-frequency system for ultrahigh-sensitive sensing

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