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Proceedings Paper

Intersubband device applications of nitride quantum structures
Author(s): Roberto Paiella; Kristina Driscoll; Yan Li; Yitao Liao; Anirban Bhattacharyya; Christos Thomidis; Lin Zhou; David J. Smith; Enrico Bellotti; Theodore D. Moustakas
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Paper Abstract

Nitride semiconductor quantum structures feature some unique properties for intersubband device development, including a record large conduction-band offset that allows extending the operating wavelength to the near-infrared spectral region, and large optical phonon energies that are advantageous for the development of THz devices. In this paper we review our recent work aimed at the demonstration of novel intersubband device functionalities using these materials. In particular, we have developed ultrafast all-optical switching devices operating at fiber-optic communication wavelengths, based on intersubband cross-absorption saturation in GaN/AlN quantum-well waveguides. Strong self-phase modulation of ultrafast optical pulses has also been measured in these waveguides, revealing a large intersubband refractive-index nonlinearity which is also promising for all-optical switching applications. Furthermore, we have demonstrated optically pumped intersubband light emission from GaN/AlN quantum wells at the record short wavelength of about 2 μm. Finally, we have used a rigorous Monte Carlo model to show that GaN/AlGaN quantum wells are promising for the development of THz quantum cascade lasers capable in principle of operation without cryogenic cooling.

Paper Details

Date Published: 22 January 2010
PDF: 9 pages
Proc. SPIE 7608, Quantum Sensing and Nanophotonic Devices VII, 76080N (22 January 2010); doi: 10.1117/12.836260
Show Author Affiliations
Roberto Paiella, Boston Univ. (United States)
Kristina Driscoll, Boston Univ. (United States)
Yan Li, Boston Univ. (United States)
Yitao Liao, Boston Univ. (United States)
Anirban Bhattacharyya, Boston Univ. (United States)
Christos Thomidis, Boston Univ. (United States)
Lin Zhou, Arizona State Univ. (United States)
David J. Smith, Arizona State Univ. (United States)
Enrico Bellotti, Boston Univ. (United States)
Theodore D. Moustakas, Boston Univ. (United States)


Published in SPIE Proceedings Vol. 7608:
Quantum Sensing and Nanophotonic Devices VII
Manijeh Razeghi; Rengarajan Sudharsanan; Gail J. Brown, Editor(s)

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