Recent results in quantum cascade lasers and intersubband transitions in GaN/AlGaN multiple quantum wells

C. Gmachl; H. M. Ng; R. Paiella; R. Martini; H. Y. Hwang; D. L. Sivco; F. Capasso; A. Y. Cho; S. V. Frolov; S. N. George Chu; H. C. Liu

doi:10.1016/S1386-9477(02)00213-8

Recent results in quantum cascade lasers and intersubband transitions in GaN/AlGaN multiple quantum wells

C. Gmachl, H. M. Ng, R. Paiella, R. Martini, H. Y. Hwang, D. L. Sivco, F. Capasso, A. Y. Cho, S. V. Frolov, S. N. George Chu, H. C. Liu

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Quantum cascade (QC) lasers have been fabricated with Ge_0.25Se_0.75 chalcogenide lateral waveguide claddings. Aside from a strongly (up to ∼50%) reduced waveguide loss this device lay-out also displays a significantly reduced stray capacitance and improved high-speed modulation properties. This has been exploited for the first use of QC lasers in optical wireless communications as well as for gain-switched and actively mode-locked QC-lasers. Optical devices based on intersubband (IS) transitions face a rising interest also in other wavelength ranges due to their anticipated ultrafast electron dynamics. We present initial measurements of IS-transitions in the fiber-optics wavelength range in GaN/AlGaN samples grown by molecular beam epitaxy. IS-absorption at wavelengths of 1.44, 1.41, and 1.52 μm are measured for 11, 12, and 13 Å wide GaN quantum wells, respectively. We also measured the IS electron scattering time by conventional pump-probe technique. Using 1.55 μm as pump- and 1.70 μm as probe-wavelength, we obtain an electron scattering time of 370 fs.

Original language	English (US)
Pages (from-to)	823-828
Number of pages	6
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	13
Issue number	2-4
DOIs	https://doi.org/10.1016/S1386-9477(02)00213-8
State	Published - Mar 2002
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics

Keywords

GaN/AlGaN
Intersubband
Mid-infrared
Quantum cascade lasers

Access to Document

10.1016/S1386-9477(02)00213-8

Cite this

Gmachl, C., Ng, H. M., Paiella, R., Martini, R., Hwang, H. Y., Sivco, D. L., Capasso, F., Cho, A. Y., Frolov, S. V., George Chu, S. N., & Liu, H. C. (2002). Recent results in quantum cascade lasers and intersubband transitions in GaN/AlGaN multiple quantum wells. Physica E: Low-Dimensional Systems and Nanostructures, 13(2-4), 823-828. https://doi.org/10.1016/S1386-9477(02)00213-8

@article{9329a37acb2344179b5840a919eb743a,

title = "Recent results in quantum cascade lasers and intersubband transitions in GaN/AlGaN multiple quantum wells",

abstract = "Quantum cascade (QC) lasers have been fabricated with Ge0.25Se0.75 chalcogenide lateral waveguide claddings. Aside from a strongly (up to ∼50%) reduced waveguide loss this device lay-out also displays a significantly reduced stray capacitance and improved high-speed modulation properties. This has been exploited for the first use of QC lasers in optical wireless communications as well as for gain-switched and actively mode-locked QC-lasers. Optical devices based on intersubband (IS) transitions face a rising interest also in other wavelength ranges due to their anticipated ultrafast electron dynamics. We present initial measurements of IS-transitions in the fiber-optics wavelength range in GaN/AlGaN samples grown by molecular beam epitaxy. IS-absorption at wavelengths of 1.44, 1.41, and 1.52 μm are measured for 11, 12, and 13 {\AA} wide GaN quantum wells, respectively. We also measured the IS electron scattering time by conventional pump-probe technique. Using 1.55 μm as pump- and 1.70 μm as probe-wavelength, we obtain an electron scattering time of 370 fs.",

keywords = "GaN/AlGaN, Intersubband, Mid-infrared, Quantum cascade lasers",

author = "C. Gmachl and Ng, {H. M.} and R. Paiella and R. Martini and Hwang, {H. Y.} and Sivco, {D. L.} and F. Capasso and Cho, {A. Y.} and Frolov, {S. V.} and {George Chu}, {S. N.} and Liu, {H. C.}",

note = "Funding Information: This work was supported by DARPA/US Army Research Office under Contract DAAD19-00-C-0096. The authors would like to thank A. Michael Sergent, Albert L. Hutchinson, and Myrtle I. Blakey for their help with sample fabrication.",

year = "2002",

month = mar,

doi = "10.1016/S1386-9477(02)00213-8",

language = "English (US)",

volume = "13",

pages = "823--828",

journal = "Physica E: Low-Dimensional Systems and Nanostructures",

issn = "1386-9477",

publisher = "Elsevier",

number = "2-4",

}

TY - JOUR

T1 - Recent results in quantum cascade lasers and intersubband transitions in GaN/AlGaN multiple quantum wells

AU - Gmachl, C.

AU - Ng, H. M.

AU - Paiella, R.

AU - Martini, R.

AU - Hwang, H. Y.

AU - Sivco, D. L.

AU - Capasso, F.

AU - Cho, A. Y.

AU - Frolov, S. V.

AU - George Chu, S. N.

AU - Liu, H. C.

N1 - Funding Information: This work was supported by DARPA/US Army Research Office under Contract DAAD19-00-C-0096. The authors would like to thank A. Michael Sergent, Albert L. Hutchinson, and Myrtle I. Blakey for their help with sample fabrication.

PY - 2002/3

Y1 - 2002/3

N2 - Quantum cascade (QC) lasers have been fabricated with Ge0.25Se0.75 chalcogenide lateral waveguide claddings. Aside from a strongly (up to ∼50%) reduced waveguide loss this device lay-out also displays a significantly reduced stray capacitance and improved high-speed modulation properties. This has been exploited for the first use of QC lasers in optical wireless communications as well as for gain-switched and actively mode-locked QC-lasers. Optical devices based on intersubband (IS) transitions face a rising interest also in other wavelength ranges due to their anticipated ultrafast electron dynamics. We present initial measurements of IS-transitions in the fiber-optics wavelength range in GaN/AlGaN samples grown by molecular beam epitaxy. IS-absorption at wavelengths of 1.44, 1.41, and 1.52 μm are measured for 11, 12, and 13 Å wide GaN quantum wells, respectively. We also measured the IS electron scattering time by conventional pump-probe technique. Using 1.55 μm as pump- and 1.70 μm as probe-wavelength, we obtain an electron scattering time of 370 fs.

AB - Quantum cascade (QC) lasers have been fabricated with Ge0.25Se0.75 chalcogenide lateral waveguide claddings. Aside from a strongly (up to ∼50%) reduced waveguide loss this device lay-out also displays a significantly reduced stray capacitance and improved high-speed modulation properties. This has been exploited for the first use of QC lasers in optical wireless communications as well as for gain-switched and actively mode-locked QC-lasers. Optical devices based on intersubband (IS) transitions face a rising interest also in other wavelength ranges due to their anticipated ultrafast electron dynamics. We present initial measurements of IS-transitions in the fiber-optics wavelength range in GaN/AlGaN samples grown by molecular beam epitaxy. IS-absorption at wavelengths of 1.44, 1.41, and 1.52 μm are measured for 11, 12, and 13 Å wide GaN quantum wells, respectively. We also measured the IS electron scattering time by conventional pump-probe technique. Using 1.55 μm as pump- and 1.70 μm as probe-wavelength, we obtain an electron scattering time of 370 fs.

KW - GaN/AlGaN

KW - Intersubband

KW - Mid-infrared

KW - Quantum cascade lasers

UR - http://www.scopus.com/inward/record.url?scp=0036492693&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036492693&partnerID=8YFLogxK

U2 - 10.1016/S1386-9477(02)00213-8

DO - 10.1016/S1386-9477(02)00213-8

M3 - Article

AN - SCOPUS:0036492693

SN - 1386-9477

VL - 13

SP - 823

EP - 828

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 2-4

ER -

Recent results in quantum cascade lasers and intersubband transitions in GaN/AlGaN multiple quantum wells

Abstract

All Science Journal Classification (ASJC) codes

Keywords

Access to Document

Other files and links

Fingerprint

Cite this