Saturation and bistability of defect-mode intersubband polaritons

Zanotto, Simone; Bianco, Federica; Sorba, L.; Biasiol, G.; Tredicucci, Alessandro

doi:10.1103/physrevb.91.085308

Cited by 12 publications

(14 citation statements)

References 28 publications

(34 reference statements)

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“…To gain confidence in the theory detailed above, in the following we will analyze a resonant metasurface embedding semiconductor quantum wells (QWs). Such device implements a prototypical system in which weak and strong coupling have been observed, and where they can be harnessed to develop efficient mid-infrared and terahertz light sources, as well as functional optical components 28 29 .…”

Section: Numerical Validation Of the Model On A Realistic Systemmentioning

confidence: 99%

“…3(a) . It consists of a heterostructure of 60 equispaced GaAs/Al 0.33 Ga 0.67 As MQW, with well/barrier thicknesses 6.8/20 nm resulting in an intersubband transition frequency 28 . The membrane has thickness t 2 = 1.3 μ m, and is periodically patterned with thin (50 nm) gold stripes, whose spacing is a and filling fraction is f .…”

Section: Numerical Validation Of the Model On A Realistic Systemmentioning

confidence: 99%

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Universal lineshapes at the crossover between weak and strong critical coupling in Fano-resonant coupled oscillators

Zanotto

Tredicucci

2016

Sci Rep

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In this article we discuss a model describing key features concerning the lineshapes and the coherent absorption conditions in Fano-resonant dissipative coupled oscillators. The model treats on the same footing the weak and strong coupling regimes, and includes the critical coupling concept, which is of great relevance in numerous applications; in addition, the role of asymmetry is thoroughly analyzed. Due to the wide generality of the model, which can be adapted to various frameworks like nanophotonics, plasmonics, and optomechanics, we envisage that the analytical formulas presented here will be crucial to effectively design devices and to interpret experimental results.

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Section: Numerical Validation Of the Model On A Realistic Systemmentioning

confidence: 99%

Section: Numerical Validation Of the Model On A Realistic Systemmentioning

confidence: 99%

Universal lineshapes at the crossover between weak and strong critical coupling in Fano-resonant coupled oscillators

Zanotto

Tredicucci

2016

Sci Rep

Self Cite

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“…Since a large number of electrons are involved in the optical transition, the Rabi splitting can be pushed to extremely high values just by increasing the doping level in the well, in some cases even comparable to the transition frequency in the so-called ultra-strong light-matter coupling regime as predicted in [11,12] and experimentally observed in [13][14][15]. The strong coupling to the electromagnetic field displayed by ISB transitions is typically associated to much faster decay processes, which have so far limited the Qfactor of the polariton modes well below 100: while this is well enough to clearly observe the polariton mode splitting [9,10,14,16], relatively high pump intensities are needed to clearly observe nonlinear phenomena [17,18]. In spite of these difficulties, a wide community is actively involved in the study of nonlinear optical phenomena in these systems, from new sources of coherent light in the MIR/FIR domain based on parametric oscillation [19,20], Bose-Einstein condensation [21], or interpolariton transitions [22], to the development of optical comb sources [23,24], to the generation of nonclassical states of light [11,25].Except for the above-cited works, the theoretical study of these processes is still lacking a microscopic model of interaction between ISB polaritons and an flexible and easily manageable theory to describe nonlinear processes with ISB polaritons in different configurations and geometries.…”

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confidence: 75%

Generalized Gross-Pitaevskii model for intersubband polariton lasing

Nespolo

Carusotto

2019

Phys. Rev. B

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We develop a generalized Gross-Pitaevskii approach to the driven-dissipative dynamics of intersubband polaritons in patterned planar microcavities where the cavity mode is strongly coupled to an intersubband transition in doped quantum wells. Substantial differences with respect to the case of interband excitonic polaritons are highlighted, in particular the non-Markovian features of the radiative decay. The accuracy of the method is validated on the linear reflection properties of the cavity, that quantitatively reproduce experimental observations. The theoretical framework is then applied in the nonlinear regime to study optical parametric oscillation processes for intersubband polaritons. Our findings open interesting perspectives in view of novel coherent laser sources operating in the mid and far infrared.Planar semiconductor microcavities have emerged as a versatile tool to address fundamental questions in the physics of light-matter interaction, and realize a new generation of optoelectronic devices, with applications that are still largely unexplored [1]. In particular, a rich variety of optical phenomena are observed when a quantum well element is embedded in the cavity layer and an electronic transition is resonantly coupled to the cavity mode. Depending on the structure and the doping level of the quantum well, the transition can be of either inter-band [2] or inter-subband nature [3]: in the former case, it involves some electrons being promoted from the valence to the conduction band and is typically located in the near-infrared or visible domain. In the latter case, electrons (or holes) are promoted from a filled subband of the conduction (or valence) band to another, initially empty subband. For a strong enough light-matter coupling, photons can undergo several absorption-emission cycles before being lost. In this so-called strong lightmatter coupling regime, the eigenmodes are superpositions of photonic and matter excitations: depending on the nature of the electronic transition involved, we usually speak of interband polaritons or intersubband polaritons.As a few decades of intense theoretical and experimental research have shown, interband (IB) polaritons combine the extremely low mass of cavity photons (orders of magnitude lower than the excitonic one) with sizable interactions stemming from their excitonic component. These remarkable properties have been at the heart of the celebrated observations of Bose-Einstein condensation [4] and superfluidity effects [5,6] in a polariton gas and are still being widely exploited in a number of exciting directions, as reviewed in [1,7,8].Since with the early observations [9, 10], the research on intersubband (ISB) polaritons has also made impressive steps. In addition to their operation at much longer wavelengths in the mid or far infrared spectively), ISB polaritons display a few other remarkable differences compared to IB ones. Since a large number of electrons are involved in the optical transition, the Rabi splitting can be pushed to extremely high val...

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“…All cases, aside from a classical cavity, can be realized using photonic crystals, photonic band gaps, whispering‐galleries, Bragg reflectors, or metal layers. Table shows some recent Rabi splitting experimental results for various microcavity structures.…”

Section: Light–matter Coupling In Microcavitiesmentioning

confidence: 99%

Strong Coupling in Microcavity Structures: Principle, Design, and Practical Application

Yua

et al. 2018

Laser & Photonics Reviews

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When interaction between light and matter is in the strong coupling region, matter has a significant influence on the whole system, with potential to develop low-power active optical devices. Strong coupling can verify some basic problems of quantum physics, and it is an ideal system to study light-matter interaction, providing an intuitive and accurate demonstration of some pure quantum effects with small mass and easy optical control. Here, the most important advances in strong coupling in recent years are described. Of late, an extensive series of experimental and theoretical findings, and remarkable achievements have been made in this field. Strong coupling between cavities and some new materials such as semiconductors, two-dimensional (2D) material, and quantum dots (QDs) are the focus of research in this field. Another field that has made outstanding progress is the application of this optical phenomenon, including resonance-enhanced Raman and infrared spectra, nanolasers, and cavity-enhanced sensing. Furthermore, the potential in this field arises for future quantum information and quantum optical devices. It is now developing at a very fast rate and can be predicted to have broad prospects for development in the future. Some prospects in terms of design and application are included.

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Saturation and bistability of defect-mode intersubband polaritons

Cited by 12 publications

References 28 publications

Universal lineshapes at the crossover between weak and strong critical coupling in Fano-resonant coupled oscillators

Universal lineshapes at the crossover between weak and strong critical coupling in Fano-resonant coupled oscillators

Generalized Gross-Pitaevskii model for intersubband polariton lasing

Strong Coupling in Microcavity Structures: Principle, Design, and Practical Application

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