Proposal for a Bosonic Cascade Laser

Liew, Timothy Chi Hin; Glazov, M. M.; Kavokin, K. V.; Shelykh, I. A.; Kaliteevski, M. A.; Kavokin, Alexey

doi:10.1103/physrevlett.110.047402

Cited by 70 publications

(89 citation statements)

References 10 publications

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“…In bosonic cascade lasers (BCLs) excitons or excitonpolaritons are resonantly injected into one of the upper quantum confined states in a parabolic potential trap [90], whose frequency lies in the THz region (see Fig. 7).…”

Section: Bosonic Cascade Lasersmentioning

confidence: 99%

Bosonic lasers: The state of the art (Review Article)

Kavokin

Liew

Schneider³

et al. 2016

Low Temperature Physics

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Bosonic lasers represent a new generation of coherent light sources. In contrast to conventional, fermionic, lasers they do not require inversion of electronic population and do not rely on the stimulated emission of radiation. Bosonic lasers are based on the spontaneous emission of light by condensates of bosonic quasiparticles. The first realization of bosonic lasers has been reported in semiconductor microcavities where bosonic condensates of exciton-polaritons first studied several decades ago by K.B. Tolpygo can be formed under optical or electronic pumping. In this paper we overview the recent progress in the research area of polaritonics, address the perspective of realization of polariton devices: from bosonic cascade lasers to spin transistors and switches.

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Section: Bosonic Cascade Lasersmentioning

confidence: 99%

Bosonic lasers: The state of the art (Review Article)

Kavokin

Liew

Schneider³

et al. 2016

Low Temperature Physics

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“…Bosonic cascades are designed to function in the limit W τ ≪ 1, where they make use of the bosonic stimulation of scattering processes to allow efficient relaxation through all levels of the cascade. Fermionic cascades can not function in the limit W τ ≪ 1; taking the typical value W τ = 8.3 × 10 − 7 [1] for bosonic cascades and substituting into the fermionic case will leave a system with no significant population of all but the highest level.…”

Section: Comparison With Fermionic Cascadesmentioning

confidence: 99%

“…The populations of intermediate levels of the bosonic cascade change as the THz pulse passes, nevertheless. In comparison, a fermionic cascade laser does not reveal any of these properties.The concept of bosonic cascade lasers has been introduced a few years ago with the objective of generating THz frequency radiation in a compact semiconductor system [1]. The bosonic cascade is defined as a series of bosonic energy levels with equal THz range spacing in energy.…”

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confidence: 99%

Optically induced transparency in bosonic cascade lasers

Liew

Kavokin

2018

Opt. Lett.

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Bosonic cascade lasers are terahertz (THz) lasers based on stimulated radiative transitions between bosonic condensates of excitons or exciton-polaritons confined in a trap. We study the interaction of an incoming THz pulse resonant in frequency with the transitions between neighboring energy levels of the cascade. We show that at certain optical pump conditions the cascade becomes transparent to the incident pulse: it neither absorbs nor amplifies it, in the mean field approximation. The populations of intermediate levels of the bosonic cascade change as the THz pulse passes, nevertheless. In comparison, a fermionic cascade laser does not reveal any of these properties.The concept of bosonic cascade lasers has been introduced a few years ago with the objective of generating THz frequency radiation in a compact semiconductor system [1]. The bosonic cascade is defined as a series of bosonic energy levels with equal THz range spacing in energy. A boson excited in the highest level can undergo a series of transitions down the cascade, generating multiple THz frequency photons in analogy to fermionic quantum cascade lasers [2,3], which were also developed in the THz regime [4][5][6][7]. The critical difference of a bosonic cascade is that bosonic final state stimulation enhances the scattering rates such that even in the limit of weak spontaneous scattering rate, particles can reach the ground level of the cascade. A variety of theoretical considerations of bosonic cascades have since been considered, including the quantum statistics of the cascade levels [8] and the interplay of double bosonic stimulation coming from a THz cavity and the bosonic particles themselves [9]. Physical implementations of bosonic cascades can be based on excitons or exciton-polaritons in parabolic traps [10]

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“…Recently, the system of equidistant states of bosons was considered and a bosonic cascade laser (BCL) was proposed. The BCL demonstrates a range of intriguing properties, such as nontrivial paritydependent effects and a quantization of the occupations of different excitonic modes [16].The aim of this paper is to develop further the theory of BCL and investigate double bosonic stimulation of THz emission in BCL: in the presence of the cavity for THz radiation, the rate of transitions between bosonic levels goes up with an increase of both the population of bosonic states and the THz mode. Quantitative analysis is presented for the set of parameters, characterizing a realistic polaritonic microcavity interacting with THz radiation, although qualitative conclusions can be applied to a BCL of an arbitrary nature.…”

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confidence: 99%

Double-boson stimulated terahertz emission in a polariton cascade laser

Kaliteevskii

Иванов

2013

Tech. Phys. Lett.

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Abstract.We have considered a system of equidistant polaritonic states, interacting with an electromagnetic field of a localized THz cavity mode. An accumulation of photons in a THz cavity mode together with bosonic stimulation of the transition between polariton levels induces intensive radiative scattering of polaritons. The concept of double bosonic stimulation of a radiative transition in a bosonic cascade laser (BCL) is formulated, and the possibility of the use of a BCL for the emission of THz radiation is investigated. The system demonstrates threshold-like behaviour and, above threshold, cascade radiative transitions of polaritons which leads to an increase of quantum efficiency, which can exceed unity. The interaction of polaritons with a reservoir leads to an increase in the threshold pumping rate and a decrease of quantum efficiency. IntroductionThe creation of an efficient solid-state emitter of THz radiation remains important task of the modern physics and technology [1]. Recently, several designs of polaritonic THz emitter, based on semiconductor microcavities, were proposed, where the rate of spontaneous emission for THz photons can be additionally increased by bosonic stimulation if a radiative transition occurs into a condensate state of bosons [2][3][4][5]. Interaction of THz photons and polaritons is a subject of intensive experimental studies [6][7][8][9][10]. Proposed polaritonic emitters, however, have a serious disadvantage: since each polariton (which has energy of the order of 1eV) can produce only one THz photon (with energy about 10 meV) most of the pumped energy is lost and the efficiency of the device remains small. The quantum (and power) efficiency of the proposed device can be increased if the polariton is made to emit several identical THz photons. A similar effect for electrons in superlattices [11] is used in the modern quantum cascade laser [12,13]. A system of equidistant polariton levels can be implemented if the exciton is quantized in a parabolic potential [14][15]. In the case of parabolic quantum wells, the transitions between equidistant electron levels (intersubband transition) manifests itself as peak in absorption and luminescence of TM-polarized light (pronounced even at room temperature), and the spectral position of the peak corresponds to intervals separating electron quantization levels. Recently, the system of equidistant states of bosons was considered and a bosonic cascade laser (BCL) was proposed. The BCL demonstrates a range of intriguing properties, such as nontrivial paritydependent effects and a quantization of the occupations of different excitonic modes [16].The aim of this paper is to develop further the theory of BCL and investigate double bosonic stimulation of THz emission in BCL: in the presence of the cavity for THz radiation, the rate of transitions between bosonic levels goes up with an increase of both the population of bosonic states and the THz mode. Quantitative analysis is presented for the set of parameters, characterizing a realistic pol...

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Proposal for a Bosonic Cascade Laser

Cited by 70 publications

References 10 publications

Bosonic lasers: The state of the art (Review Article)

Bosonic lasers: The state of the art (Review Article)

Optically induced transparency in bosonic cascade lasers

Double-boson stimulated terahertz emission in a polariton cascade laser

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