Seminar: "Emission and Detection of THz Radiation Using Graphene and III‐V Semiconductor Heterostructures" by Prof. Stephane Albon Boubanga Tombet
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Date
Location
Description
Dear All,
Femtosecond Spectroscopy Unit (Dani Unit) would like to invite you to a seminar by Prof. Stephane Boubanga Tombet as follows.
Date: October 30th Fri, 2015
Time: 11:00- 12:00
Venue: Seminar Room B503 (Center)
Speaker: Prof. Stephane Boubanga Tombet, RIEC, Tohoku University, Sendai Japan
Title: Emission and Detection of THz Radiation Using Graphene and III‐V Semiconductor Heterostructures
Abstract:
Recent advances in emission and detection of terahertz (THz) radiation using graphene and III‐V semiconductors are presented. First topic focuses on graphene, a monolayer carbon‐atomic honeycomb lattice crystal, exhibiting peculiar carrier transport and optoelectronic/plasmonic properties owing to massless and gapless energy spectrum. Theoretical and experimental studies toward the creation of graphene terahertz injection lasers are described [1-4].
Second the two dimensional plasmons in III‐V semiconductor heterostructures re discussed for emission and detection of THz radiation. The device structure is based on a high‐electron mobility transistor and incorporates the author’s original asymmetrically interdigitated dual‐grating gates [5,6].
Biography:
Stephane Albon Boubanga Tombet received his MS and PhD degrees in condensed matter physics from Montpellier 2 University in France in 2005 and 2008, respectively. From 2008 to 2009, he worked for Montpellier 2 University as a teacher and research assistant. From 2009 to 2011, he joined the Research Institute of Electrical Communication, Tohoku University, in Sendai, as a postdoctoral researcher granted by the Japanese Society for the Promotion of Science (JSPS). After that he Los Alamos National Labs in New Mexico as a postdoctoral researcher until Jun 2013. He is currently working as an Associate Professor at the Research Institute of Electrical Communication, Tohoku University. His current research interests include III-V based plasmonics based emitters and receivers in the millimeter-wave and terahertz regions, graphene based materials/devices, gaphene active plasmonics and their terahertz applications.
REFERENCES
[1] V. Ryzhii et al., J. Appl. Phys. 101, 083114 (2007).
[2] T. Otsuji et al., IEEE J. Select. Topics in Quantum Electron. 19, 8400209 (2013).
[3] S. Boubanga Tombet et al., Phys. Rev. B 85, 035443 (2012)
[4] ] T. Watanabe et al., New J. Phys. 15, 075003 (2013).
[5] ] S. Boubanga Tombet et al., Appl. Phys. Lett., Vol. 104, pp. 262104-1-4, 2014
[6] Y. Kurita et al. Appl. Phys. Lett., Vol. 104, pp. 251114-1-4, 2014
We look forward to seeing many of you at the seminar.
Sincerely yours,
Yumi Ito
Dani Unit
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