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Graphene cold-electron bolometer
N. Lindvall , M. Tarasov , L. Kuzmin , and A. Yurgens
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(1) Department of Microtechnology and Nanoscience/MC2, Chalmers University of Technology, GЖteborg, Sweden e-mail: niclas.lindvall@chalmers.se Graphene, the atomic monolayer of carbon, has gotten a lot of interest since it was experimentally realized in 2004, an achievement acknowledged with the Nobel prize in physics 2010 [1,2]. Graphene may be bring contributions to fundamental research, electronic devices, sensors, biological imaging, photonics and several other fields. We fabricate high quality graphene using the so called "scotch-tape-method", where flakes of graphite are peeled with tape and deposited on a substrate. The electronic quality of the graphene is verified using quantum Hall- and field effect measurements. This shows that it is in fact high quality single-layer graphene. Many of the most promising applications rely on sensor devices based on graphene. In this work we investigate a coldelectron bolometer with a graphene absorber. The cold-electron bolometer is one type of cryogenic bolometers for high sensitivity THz radiation detection [3]. It consists of a normal metal absorber connected to superconducting antenna leads through superconducting-insulator-normal metal (SIN) junctions. One of the main factors limiting the performance of such device is the absorber volume. The use of graphene as the normal metal absorber presents a possible route to drastically reduce the volume, being only one atom thick. At 277 mK we measure the temperature responsitivity of 0.4 V/mK and a clear optical response to microwaves at frequency 110 GHz.
[1] K. S. Novoselov, et al., "Electric field effect in atomically thin carbon films,", Science, 306 666-669, 2004 [2] A. K. Geim, and K. S. Novoselov, "The rise of graphene," Nature materials, 6 183-191, 2007 [3] L. Kuzmin, and D. Golubev, "On the concept of an optimal hot-electron bolometer with NIS tunnel junctions," Physica C, 372-376 378-382, 2002