Saser (Sound Amplification by Stimulated Emission of Radiation)

Zavtrak, S. T.; Volkov, I. V.

doi:10.1134/1.1258812

Cited by 10 publications

(6 citation statements)

References 3 publications

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“…A detailed discussion can be found in the review of Kurz et al [28]. Stimulated emission of phonons and several kinds of saser were also discussed [30][31][32][33][34][35][36][37][38][39][40]. Among the potential applications of our saser we stress acoustic nanoscopy [41].…”

Section: The Dbh Phonon Lasermentioning

confidence: 93%

A double-barrier heterostructure generator of terahertz phonons: many-body effects

Makler¹,

Camps²,

Weberszpil³

et al. 2000

J. Phys.: Condens. Matter

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In this paper we study the generation of coherent terahertz phonons in a double-barrier heterostructure (DBH) under the influence of an external applied bias. The system is characterized by an energy difference between the two lowest levels in the well, which resonates with the optical phonon energy, producing a high rate of emission of longitudinal optical (LO) phonons. The strong electron-phonon interaction in a polar semiconductor leads to the formation of a polaron that is relevant close to this resonance. Therefore the levels corresponding to the first excited state and the satellite of the ground state anticross in two polaronic branches. The LO phonon has a very short lifetime. It decays by stimulated emission of a pair of phonons (LO + TA) (where TA stands for transverse acoustic). As a consequence an intense beam of TA coherent phonons is produced, which could have several important applications. A rough model of this system has already been presented (Makler S S, Vasilevskiy M I, Weberszpil J, Anda E V, Tuyarot D E and Pastawski H M 1998 J. Phys.: Condens. Matter 10 5905). Several improvements to that model are presented here. Besides the more accurate treatment of the electron-phonon interaction, the phonon-phonon interaction is considered here taking into account the fact that the whole system is out of equilibrium. The results confirm that the proposed phonon laser is reliable.

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Section: The Dbh Phonon Lasermentioning

confidence: 93%

A double-barrier heterostructure generator of terahertz phonons: many-body effects

Makler¹,

Camps²,

Weberszpil³

et al. 2000

J. Phys.: Condens. Matter

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“…There is an attractive theoretical scheme of sound amplification by stimulated emission of radiation (SASER) proposed by Zavtrak et al [5][6][7]. In this scheme a liquid dielectric with uniformly distributed dispersed particles was suggested as an active media.…”

Section: Phonon Generation By Quantum Dotsmentioning

confidence: 99%

<title>Semiconductor quantum dot superlattice for coherent acoustic phonon emission</title>

Khitun

Wang

2002

SPIE Proceedings

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We present a novel concept of using quantum dot superlattices for coherent acoustic phonon emission. Coherent lattice wave generation is proposed by collective dot vibrations in a self-assembled quantum dot array, where superlattice structure acts as a phonon resonator. The dots vibrations are synchronized by an external electric field. The proposed scheme has advantage of low phonon scattering rate in quantum dots, that enables generating high intensity phonon beams at low amplitude of the pumping electric field. The advantage is illustrated by numerical simulations carried out for Si/Ge superlattice. The proposed scheme may find many phonon applications, such as for local temperature control, phonon assisted optical transition enhancement, and characterization of low-dimensional structures.

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“…Here, by introducing the concept of CPAL point into acoustic PT symmetry, similar CPA-saser (CPAS) point can be observed in the field of acoustics. Here, saser is the acoustic equivalence of optical laser [33]. Therefore, the acoustic PT-symmetric system can simultaneously behave as a perfect absorber that absorbs the incident acoustic waves, and an amplifier that amplifies the incident acoustic waves.…”

Section: Introductionmentioning

confidence: 99%

Bidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global PT-symmetries

Liu¹,

Zhang²,

Wang³

et al. 2020

Sci Rep

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Negative refraction plays an important role in acoustic wave manipulation and imaging. However, conventional systems based on acoustic metamaterials suffer from the limits induced by loss-related and resolution issues. In this work, a parity-time (PT)-symmetric system is introduced to realize loss-free bidirectional acoustic negative refraction. The system is composed of a pair of locally PT-symmetric multi-layer metasurfaces sandwiching a region of free space, which also forms a global PT symmetry. The property of bidirectional negative refraction, which is rare for general PT-symmetric structures, is related to the coexistence of amplification and absorption in the locally PT-symmetric metasurfaces at their PT-broken phases. Such metasurfaces can freely switch their states between coherent perfect absorber (CPA) and amplifier depending on the direction of incidence. Our results provide a physical mechanism for realizing bidirectional functions in acoustic PT-symmetric systems.

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Saser (Sound Amplification by Stimulated Emission of Radiation)

Cited by 10 publications

References 3 publications

A double-barrier heterostructure generator of terahertz phonons: many-body effects

A double-barrier heterostructure generator of terahertz phonons: many-body effects

<title>Semiconductor quantum dot superlattice for coherent acoustic phonon emission</title>

Bidirectional acoustic negative refraction based on a pair of metasurfaces with both local and global PT-symmetries

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