Ultrastrong coupling of intersubband plasmons and terahertz metamaterials

Dietze, D.; Andrews, A. M.; Klang, P.; Strasser, G.; Unterrainer, K.; Darmo, J.

doi:10.1063/1.4830092

Cited by 33 publications

(31 citation statements)

References 25 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is due to a further lateral depletion of the QWs originating from surface traps at the etched surface of the absorbing region, as already reported in the case of etched pillar or nanowire structures. 22,45,46 From our data, we infer a plasma frequency for the LC resonators that is 7.6% lower than the one for the patch cavities. Correcting for this effect yields an overlap factor Ψ 2 = 0.79.…”

mentioning

confidence: 69%

Ultrastrong Light–Matter Coupling in Deeply Subwavelength THz LC Resonators

et al. 2019

View full text Add to dashboard Cite

The ultra-strong light-matter coupling regime has been demonstrated in a novel threedimensional inductor-capacitor (LC) circuit resonator, embedding a semiconductor twodimensional electron gas in the capacitive part. The fundamental resonance of the LC circuit interacts with the intersubband plasmon excitation of the electron gas at ω c = 3.3 THz with a normalized coupling strength 2Ω R /ω c = 0.27. Light matter interaction is driven by the quasi-static electric field in the capacitors, and takes place in a highly subwavelength effective volume V eff = 10 −6 λ 3 0 . This enables the observation of the ultra-strong light-matter coupling with 2.4 × 10 3 electrons only. Notably, our fabrication protocol can be applied to the integration of a semiconductor region into arbitrary nano-engineered three dimensional meta-atoms. This circuit architecture can be considered the building block of metamaterials for ultra-low dark current detectors. Metamaterials were introduced to enable new electromagnetic properties of matter which are not naturally found in nature. Celebrated examples of such achievements are, for instance, negative refraction 1 and artificial magnetism. 2 The unit cells of metamaterials are artificially designed meta-atoms that have dimensions ideally much smaller than the wavelength of interest λ 0 . 3 Such meta-atoms act as high frequency inductor-capacitor (LC) resonators which sustain a resonance close to λ 0 ∝ √ LC. 3 The resonant behaviour, occurring into highly subwavelength volumes, generates high electromagnetic field intensities which, as pointed out by the seminal paper of Pendry et al., 2 are crucial to implement artificial electromagnetic properties of a macroscopic ensemble of meta-atoms. Moreover, the ability to control and enhance the electromagnetic field at the nanoscale is beneficial for optoelectronic devices, such as nano-lasers 4 electromagnetic sensors 5-7 and detectors. 8-12 For instance, metamaterial architectures have lead to a substantial decrease of the thermally excited dark current in quantum infrared detectors, resulting in higher temperature operation. 11,12The LC circuit can be seen as a quantum har-

show abstract

mentioning

confidence: 69%

Ultrastrong Light–Matter Coupling in Deeply Subwavelength THz LC Resonators

et al. 2019

View full text Add to dashboard Cite

show abstract

“…When the strength of the light-matter coupling becomes comparable to the bare excitation frequencies, the interaction becomes non-perturbative. The rich phenomenology which becomes then observable [92,[96][97][98][240][241][242][243][244][245][246][247][248][249][250][251][252][253][254][255][256][257][258][259] has led to a remarkable interest in those nonperturbative regimes, which have been experimentally realized in a number of experimental implementations well described, at least in first approximation [260][261][262][263][264], by the Dicke model [265][266][267][268][269][270][271][272][273][274][275][276][277][278][279][280][281]. A number of works investigated the impact of losses in this...…”

Section: F Ultrastrong-coupling Regimementioning

confidence: 99%

Open quantum systems with local and collective incoherent processes: Efficient numerical simulations using permutational invariance

et al. 2018

View full text Add to dashboard Cite

The permutational invariance of identical two-level systems allows for an exponential reduction in the computational resources required to study the Lindblad dynamics of coupled spin-boson ensembles evolving under the effect of both local and collective noise. Here we take advantage of this speedup to study several important physical phenomena in the presence of local incoherent processes, in which each degree of freedom couples to its own reservoir. Assessing the robustness of collective effects against local dissipation is paramount to predict their presence in different physical implementations. We have developed an open-source library in Python, the Permutational-Invariant Quantum Solver (PIQS), which we use to study a variety of phenomena in driven-dissipative open quantum systems. We consider both local and collective incoherent processes in the weak, strong, and ultrastrong-coupling regimes. Using PIQS, we reproduced a series of known physical results concerning collective quantum effects and extended their study to the local driven-dissipative scenario. Our work addresses the robustness of various collective phenomena, e.g., spin squeezing, superradiance, quantum phase transitions, against local dissipation processes. arXiv:1805.05129v5 [quant-ph]

show abstract

“…A term "Ultrastrong coupling" (USC) had also been introduced to describe the situation where the coupling (Rabi) energy becomes comparable to the photon energy itself, meaning that the coupling changes electronic structure of the material itself. This regime is difficult to achieve in the optical range of frequencies but it can be feasible with THz radiation [11,12] At the same time, with the MQW exciton polariton in the semiconductor cavity another, intermediate, regime of the so-called "very strong coupling" (VSC) exits in which the Rabi energy Ω  is much less than photon energy ω  but it is comparable or larger than the exciton binding energy E X . Then as shown in [13]one can no longer consider coupling as a weak perturbation to the "rigid" exciton -the exciton in cavity polariton becomes flexible, or, better said, "pliable" as its radius decreases for the lower polariton and increases for the upper one causing increase of the effective binding energy in the lower polariton.…”

Section: Introductionmentioning

confidence: 99%

Pliable polaritons: Wannier exciton-plasmon coupling in metal-semiconductor structures

Khurgin

2018

Nanophotonics

View full text Add to dashboard Cite

Plasmonic structures are known to support the modes with sub-wavelength volumes in which the field/matter interactions are greatly enhanced. Coupling between the molecular excitations and plasmons leading to formation of "plexcitons" has been investigated for a number of organic molecules. However, plasmon-exciton coupling in metal/semiconductor structures have not experienced the same degree of attention. In this work we show that the "very strong coupling" regime in which the Rabi energy exceeds the exciton binding energy is attainable in semiconductor-cladded plasmonic nanoparticles and leads to formation of Wannier Exciton-Plasmon Polariton (WEPP) that is bound to the metal nanoparticle and characterized by dramatically smaller (by factor of few) excitonic radius and correspondingly higher ionization energy. This higher ionization energy exceeding approaching 100meV for the CdS/Ag structures may make room temperature Bose Einstein condensation and polariton lasing in plasmonic/semiconductor structures possible.

show abstract

Ultrastrong coupling of intersubband plasmons and terahertz metamaterials

Cited by 33 publications

References 25 publications

Ultrastrong Light–Matter Coupling in Deeply Subwavelength THz LC Resonators

Ultrastrong Light–Matter Coupling in Deeply Subwavelength THz LC Resonators

Open quantum systems with local and collective incoherent processes: Efficient numerical simulations using permutational invariance

Pliable polaritons: Wannier exciton-plasmon coupling in metal-semiconductor structures

Contact Info

Product

Resources

About