High-speed modulation of a terahertz quantum cascade laser by coherent acoustic phonon pulses

Autor: Aniela Dunn, Caroline Poyser, Paul Dean, Aleksandar Demić, Alexander Valavanis, Dragan Indjin, Mohammed Salih, Iman Kundu, Lianhe Li, Andrey Akimov, Alexander Giles Davies, Edmund Linfield, John Cunningham, Anthony Kent

Publikováno v: Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020)

The typical electronic modulation of terahertz quantum cascade lasers is fundamentally limited at fast timescales by device properties. Here the authors propose and study an alternative, acoustic mechanism for modulating such THz QCLs at high speed.

Externí odkaz: https://doaj.org/article/d7158017a82e4630849c7f5e1cc82a6b

High-speed modulation of terahertz quantum cascade lasers by acoustic phonon pulses

Autor: Anthony J. Kent, John Cunningham, Aniela Dunn, Paul Dean, Alexander Valavanis

Publikováno v: Novel In-Plane Semiconductor Lasers XX.

The fast modulation of lasers is a fundamental requirement for applications in optical communications, high-resolution spectroscopy and metrology. Here, we report a new mechanism to modulate the emission from a terahertz frequency quantum cascade las

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3deb326de4856c15a76f464889d06406
https://doi.org/10.1117/12.2577555

Broadband Nonlinear Spectroscopy of Hydrogen-Like Levels in Ge: As

Autor: Thomas B. Gill, Andrew D. Burnett, Aniela Dunn, Joshua R. Freeman, Edmund H. Linfield, Alexander Giles Davies, Paul Dean, David R. Bacon

Publikováno v: 2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).

We present broadband nonlinear THz spectroscopy and saturation of hydrogen-like electronic states of Arsenic ions, trapped in a solid Geranium substrate. The broadband pulses are generated by a photoconductive array.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d21232c8cedf7882c98294bafe23749e
https://doi.org/10.1109/irmmw-thz46771.2020.9370613

High-Speed Modulation of a Terahertz Quantum Cascade Laser by Coherent Acoustic Phonon Pulses

Autor: Alexander Valavanis, Iman Kundu, John Cunningham, Aniela Dunn, Edmund H. Linfield, Paul Dean, Lianhe Li, Aleksandar Demić, Dragan Indjin, M. Salih, Anthony J. Kent, Caroline L. Poyser, A. V. Akimov, Alexander Giles Davies

Publikováno v: Nature Communications, Vol 11, Iss 1, Pp 1-8 (2020)
Nature Communications

The fast modulation of lasers is a fundamental requirement for applications in optical communications, high-resolution spectroscopy and metrology. In the terahertz-frequency range, the quantum-cascade laser (QCL) is a high-power source with the poten

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cdf44baa916c4885dd4b033134e0d709
https://eprints.whiterose.ac.uk/155418/14/s41467-020-14662-w.pdf

Investigating efficiency droop in InGaN/GaN quantum well structures using ultrafast time‐resolved terahertz and photoluminescence spectroscopy

Autor: Matthew J. Davies, Darren M. Graham, Ben F. Spencer, Samantha J. O. Hardman, Simon Hammersley, Colin J. Humphreys, Menno J. Kappers, Phil Dawson, Rachel A. Oliver, Aniela Dunn

Publikováno v: Dunn, A, Spencer, B F, Hardman, S J O, Graham, D M, Hammersley, S, Davies, M, Dawson, P, Kappers, M J, Oliver, R A & Humphreys, C J 2016, ' Investigating efficiency droop in InGaN/GaN quantum well structures using ultrafast time-resolved terahertz and photoluminescence spectroscopy ', Physica Status Solidi. C: Current Topics in Solid State Physics, pp. 252-255 . https://doi.org/10.1002/pssc.201510193

The mechanisms governing efficiency droop in an In0.18Ga0.82N/GaN multiple quantum well structure were investigated using a combination of ultrafast time-resolved terahertz and photoluminescence spectroscopy. From excitation fluence dependent studies

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fd01fb70444d1c8943ff9de30dc6722b
https://doi.org/10.1002/pssc.201510193