Purcell Enhancement of Spontaneous Emission from Quantum Cascades inside Mirror-Grating Metal Cavities at THz Frequencies

Todorov, Yanko; Sagnes, I.; Abram, I.; Minot, C.

doi:10.1103/physrevlett.99.223603

Cited by 37 publications

(34 citation statements)

References 15 publications

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“…This estimate agrees with the experimental results of Ref. 8. The generation of terahertz emission by a microcavity in the polariton lasing regime is conveniently described by a system of kinetic equations for the upper and lower polariton states and the terahertz mode.…”

supporting

confidence: 89%

Stimulated emission of terahertz radiation by exciton-polariton lasers

Kavokin

Kaliteevski

Abram

et al. 2010

Applied Physics Letters

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supporting

confidence: 89%

Stimulated emission of terahertz radiation by exciton-polariton lasers

Kavokin

Kaliteevski

Abram

et al. 2010

Applied Physics Letters

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“…3 density of states has a sharp peak around the eigenfrequency of THz cavity and the rate of spontaneous emission is dramatically increased due to the Purcell effect [31]. Current state of technology allows the increasing of the emission rates in the THz regime by a factor of 100 in high-quality cavities [32]. The results of the calculation of the spectrum based on using the quantum regression theorem are presented in Fig.…”

Section: Discussionmentioning

confidence: 99%

Asymmetric quantum dot in a microcavity as a nonlinear optical element

Savenko

Shelykh

2012

Phys. Rev. A

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We have investigated theoretically the interaction between individual quantum dot with broken inversion symmetry and electromagnetic field of a single-mode quantum microcavity. It is shown that in the strong coupling regime the system demonstrates nonlinear optical properties and can serve as emitter of the terahertz radiation at Rabi frequency of the system. Analytical results for simplest physical situations are obtained and numerical quantum approach for calculating emission spectrum is developed.

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“…This behaviour is consistent with the system operating in the weak coupling regime, with the observed enhancement of the spontaneous emission occurring through the Purcell effect. 3,4 This is further systematically revealed in Figure 2(a), which shows the I-V characteristics and measured optical power for the same active region as s is varied from 8 lm to 12 lm. The decrease in optical power for bias voltage above 1.3 V is attributed to a decoupling of the injection state with the upper state of the radiative transition, confirmed by band structure simulations (not shown).These data are summarized in Figure 2 2 All the following results of our study are performed with samples at resonance (s ¼ 11 lm) in order to be in the Purcell regime.…”

mentioning

confidence: 56%

“…A similar fitting protocol in the case of THz electroluminescence has been used in Ref. 4. Figure 3(b) summarizes the values of B compared to the reference mesa on a linear scale for various arrays fabricated for this study, as a function of the Purcell factor F p , which is explained below (Eq.…”

mentioning

confidence: 98%

“…2 Similarly, Purcell enhancement of spontaneous emission has been observed in LC microresonators as well as mirror-grating metal cavities 3,4 and microcavity effects for THz quantum cascade lasers have been discussed. 5,6 Double-metal confinement lends itself to the creation of arrays of patch antenna microcavities and has led to the demonstration of the ultra-strong lightmatter coupling regime and the realization of efficient infrared and THz detectors.…”

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confidence: 98%

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Patch antenna microcavity terahertz sources with enhanced emission

Madéo

Todorov

Gilman

et al. 2016

Applied Physics Letters

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We study the emission properties of an electroluminescent THz frequency quantum cascade structure embedded in an array of patch antenna double-metal microcavities. We show that high photon extraction efficiencies can be obtained by adjusting the active region thickness and array periodicity as well as high Purcell factors (up to 65), leading to an enhanced overall emitted power. Up to a 44-fold increase in power is experimentally observed in comparison with a reference device processed in conventional mesa geometry. Estimation of the Purcell factors using electromagnetic simulations and the theoretical extraction efficiency are in agreement with the observed power enhancement and show that, in these microcavities, the overall enhancement solely depends on the square of the total quality factor. Published by AIP Publishing. The ability to realize efficient sources and detectors at terahertz (THz) frequencies is of importance as this opens the way to a wide range of potential applications in molecular spectroscopy, imaging, security scanning, and in the fundamental studies of low energy chemical and physical processes.1 For optoelectronic devices operating in the THz range, the light-matter interaction can be significantly enhanced by confining the electromagnetic field into highly sub-wavelength metallic structures. Effective volumes as low as 10, where k is the radiation wavelength, have been achieved in passive double-metal micro-cavities comprising a dielectric layer bounded by a metallic back-plane and a patterned top metal layer.2 Similarly, Purcell enhancement of spontaneous emission has been observed in LC microresonators as well as mirror-grating metal cavities 3,4 and microcavity effects for THz quantum cascade lasers have been discussed. 5,6 Double-metal confinement lends itself to the creation of arrays of patch antenna microcavities and has led to the demonstration of the ultra-strong lightmatter coupling regime and the realization of efficient infrared and THz detectors. [7][8][9] In the case of square resonators, the resonant wavelength, k, is set by the length of the square side, s, through the formula s ¼ k/2n eff, where n eff is the effective mode index. This photonic structure is ideal for intersubband (ISB) emitters as the oscillating dipoles of the electronic transition align with the intracavity TM mode polarization. In addition, this geometry behaves as a patch antenna, rotating the polarization of the confined field by 90 when radiating into the far-field. Therefore, one can realize surface emitting photonic devices in which the light-matter interaction can be enhanced by resonantly tuning the energy of the microcavity mode with a radiative ISB transition by adjusting only the geometric parameter s. 10In this letter, we study THz frequency emission from arrays of double-metal patch microcavities containing a quantum cascade (QC) active region. We demonstrate the enhancement of the electroluminescence owing to an efficient out-coupling that is achieved by carefully choosing the thickness of ...

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Purcell Enhancement of Spontaneous Emission from Quantum Cascades inside Mirror-Grating Metal Cavities at THz Frequencies

Cited by 37 publications

References 15 publications

Stimulated emission of terahertz radiation by exciton-polariton lasers

Stimulated emission of terahertz radiation by exciton-polariton lasers

Asymmetric quantum dot in a microcavity as a nonlinear optical element

Patch antenna microcavity terahertz sources with enhanced emission

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