Journal ArticleDOI
Terahertz microcavity lasers with subwavelength mode volumes and thresholds in the milliampere range
Yannick Chassagneux,José Palomo,Raffaele Colombelli,Sukhdeep Dhillon,Carlo Sirtori,H. E. Beere,Jesse Alton,David A. Ritchie +7 more
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TLDR
In this article, a double metal waveguide with reduced active core thickness (5.82μm) is used to achieve confinement in the vertical direction, without compromising the laser performances.Abstract:
The authors demonstrate terahertz microcavity lasers with ultralow current thresholds (Ith≈4mA) and with reduced mode volumes of ≈0.7(λeffective)3, i.e., less than one cubic wavelength. A double metal waveguide with reduced active core thickness (5.82μm) is used to achieve confinement in the vertical direction, without compromising the laser performances. Confinement in the longitudinal direction is obtained using microdisk resonators. The guiding properties of surface plasmons are exploited to guide the mode with the metal contact. This makes the use of a resonator with vertical and smooth sidewalls unnecessary. The emission wavelength is λ≈114μm. The devices lase up to 70K in pulsed mode, and they achieve continuous-wave operation up to 60K.read more
Citations
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Journal ArticleDOI
Terahertz quantum-cascade lasers
TL;DR: In this paper, the state-of-the-art and future prospects for terahertz quantum-cascade laser systems are reviewed, including efforts to increase their operating temperatures, deliver higher output powers and emit longer wavelengths.
Journal ArticleDOI
Electrically pumped photonic-crystal terahertz lasers controlled by boundary conditions
Yannick Chassagneux,Raffaele Colombelli,W. Maineult,Stefano Barbieri,Harvey E. Beere,David A. Ritchie,Suraj P. Khanna,Edmund H. Linfield,Alexander Giles Davies +8 more
TL;DR: By demonstrating a general technique to implement reflecting or absorbing boundaries, this work produces evidence that whispering-gallery-like modes or true photonic-crystal states can be alternatively excited and provides a solution for the quasi-total lack of directionality typical of THz semiconductor lasers based on metal–metal waveguides.
Journal ArticleDOI
Technology, Capabilities, and Performance of Low Power Terahertz Sources
TL;DR: In this article, the various technologies for terahertz sources are reviewed, and future trends are discussed, as well as a review of the current state-of-the-art.
Journal ArticleDOI
Recent Progress in Terahertz Quantum Cascade Lasers
TL;DR: In this paper, the authors describe the recent progress in phonon-depopulated terahertz QCLs and present a novel method to tune the resonant-cavity mode of metal-metal waveguides.
Journal ArticleDOI
Efficient power extraction in surface-emitting semiconductor lasers using graded photonic heterostructures
Gangyi Xu,Raffaele Colombelli,Suraj P. Khanna,Ali Belarouci,Xavier Letartre,Lianhe Li,Edmund H. Linfield,A. Giles Davies,Harvey E. Beere,David A. Ritchie +9 more
TL;DR: Grade photonic heterostructures are developed, which localize the symmetric mode in the device centre and confine the antisymmetric modes close to the laser facet, which leads to record-high peak-power surface emission and differential efficiencies in distributed feedback lasers.
References
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Journal ArticleDOI
Terahertz semiconductor-heterostructure laser
R. Kohler,Alessandro Tredicucci,Fabio Beltram,Harvey E. Beere,Edmund H. Linfield,Giles Davies,David A. Ritchie,Rita Claudia Iotti,Fausto Rossi +8 more
TL;DR: A monolithic terahertz injection laser that is based on interminiband transitions in the conduction band of a semiconductor (GaAs/AlGaAs) heterostructure is reported, which is very promising for extending the present laser concept to continuous-wave and high-temperature operation, which would lead to implementation in practical photonic systems.
Terahertz semiconductor heterostructure laser
R. Kohler,Alessandro Tredicucci,Fabio Beltram,Harvey E. Beere,Edmund H. Linfield,Giles Davies,David A. Ritchie,Rita Claudia Iotti,Fausto Rossi +8 more
TL;DR: In this article, a monolithic terahertz injection laser that is based on interminiband transitions in the conduction band of a semiconductor (GaAs/AlGaAs) heterostructure is presented.
Journal ArticleDOI
High-Power Directional Emission from Microlasers with Chaotic Resonators
Claire F. Gmachl,Federico Capasso,Evgenii E. Narimanov,Jens U. Nöckel,A. Douglas Stone,Jérôme Faist,Deborah L. Sivco,Alfred Y. Cho +7 more
TL;DR: A "bow-tie"-shaped resonance is responsible for the improved performance of the lasers in the higher range of deformations, in contrast to "whispering-gallery"-type modes of circular and weakly deformed lasers.
Journal ArticleDOI
Linear waveguides in photonic-crystal slabs
TL;DR: In this article, a systematic analysis of waveguides in photonic-crystal slabs is presented, and the considerations that must be applied to achieve single-mode guided bands in these systems are discussed.
Journal ArticleDOI
Quantum vacuum properties of the intersubband cavity polariton field
TL;DR: In this article, a planar microcavity photon mode strongly coupled to a semiconductor inter-subband transition in presence of a two-dimensional electron gas is described. And the quantum properties of the ground state (a two-mode squeezed vacuum), which can be tuned in situ by changing the value of the Rabi frequency, e.g., through an electrostatic gate.