Research Terms
Electronic Circuits and Technology Electronics Technology Solid State Electronics Submicron Electronics Superconducting and Magnetic Materials Materials Characterization Materials Processing Surface Science Thin Films Vacuum Technology Physics
Keywords
Atomic Force Microscopy Biosensors Carbon Nanotubes Device Physics Fullererenes Graphene Nanoscale Sensors Oligopeptide Functionalization Scanning Electron Microscopy Scanning Tunneling Microscopy Surface Adhesion Surface Modification Transmission Electron Microscopy
Industries
Advanced Materials & Products Microelectronics & Computer Products
21. R.Tsuchikawa, H.Y. Ahn, S. Yao, K.D. Belfield, M. Ishigami, Photosensitization of carbon nanotubes using dye aggregates, Journal of Physics: Condensed Matter, 23, 202204 (2011). [IOP select]
22. InP- and graphene-based grating-gated transistors for tunable THz and mm-wave detection, R. E. Peale, Nima Nader Esfahani, Christopher J. Fredricksen, Gautam Medhi, Justin W. Cleary, Joshua Hendrickson, Walter R. Buchwald, Himanshu Saxena , Oliver J. Edwards, Michael S. Lodge, Ben D. Dawson, and M. Ishigami, Proc. SPIE 8164 - 7 (2011).
23. Rahul Rao, Derek Tishler, Jyoti Katoch, and M. Ishigami, Multiphonon scattering in graphene, Physical Review B, 84 113406 (2011).
24. B. Chandra, V. Perebeinos, S. Berciaud, Jyoti Katoch, M. Ishigami, P. Kim, T. F. Heinz, and J. Hone, Low bias electron scattering in structure-identified single walled carbon nanotubes: role of substrate polar phonons, Physical Review Letters, 107, 146601 (2011).
25. Jyoti Katoch and Masa Ishigami, Impact of calcium on transport property of graphene, Solid State Communications, 152, 60 (2012).
26. Jyoti Katoch, Sang Nyon Kim, Zhifeng Kuang, Barry L. Farmer, Rajesh R. Naik, Suren A. Tatulian, and Masa Ishigami, Structure of a peptide adsorbed on graphene, Nano Letters, 12, 2342 (2012).
27. Ramakrishna Podila, Rahul Rao, Ryuichi Tsuchikawa, Masa Ishigami, and Apparao M. Rao, Raman Spectroscopy of Folded and Scrolled Graphene, ACS Nano 6, 5784 (2012).
28. Brian Shevitski, Matthew Mecklenburg, William A. Hubbard, E. R. White, Ben Dawson, M. S. Lodge, Masa Ishigami, and B. C. Regan, Dark-field transmission electron microscopy and the Debye-Waller factor of graphene, Physical Review B, 87, 045417 (2013).
29. Jyoti Katoch, Cameron Glasscock, and Masa Ishigami, Ultra high vacuum-compatible sockets for pin grid arrays used in nanoscale and atomic physics, Journal of Vacuum Science and Technology B, 31, 023201 (2013).
30. Christian W. Smith, Jyoti Katoch, and Masa Ishigami, Impact of charged impurities on transport properties of graphene nanoribbons, Applied Physics Letters, 102, 133502 (2013).
31. Jaekyun Jeon, M.S. Lodge, B.D. Dawson, Masa Ishigami, F. Shewmaker, B. Chen, Superb resolution and contrast of transmission electron microscopy images of unstained biological samples on graphene-coated grids, Biochimica et Biophysica Acta-General Subjects, 1830, 3807 (2013).
32. C.R. Dean, L. Wang, P. Maher, C. Forsythe, F. Ghahari, Y. Gao, J. Katoch, M. Ishigami, P. Moon, M. Koshino, T. Taniguchi, K. Watanabe, K. L. Shepard, J. Hone, P. Kim, Hofstadter’s butterfly in Moiré superlattices: a fractal quantum hall effect,Nature, 497, 598 (2013).
33. Rahul Rao, G. Chen, L. M. R. Arava, K. Kalaga, Masa Ishigami, T.F. Heinz, P. M. Ajayan, and A.R. Harutyunyan, Graphene as an atomically thin interface for growth of vertically aligned carbon nanotubes, Nature Scientific Reports, 3, 1891 (2013).
34. Christian W. Smith; Doug Maukonen; R. E. Peale; C. J. Fredricksen; M. Ishigami; J. W. Cleary, Wavelength-selective visible-light detector based on integrated graphene transistor and surface plasmon coupler, Proc. SPIE 9083, Micro- and Nanotechnology Sensors, Systems, and Applications VI, 90832Q (4 June 2014); doi:10.1117/12.2050018
American Physical Society, Member; 1997 - present
UCF researchers have invented a graphene phototransistor providing a narrowband photoresponse that is broadly tunable over a wide frequency range. The detector can be adapted to produce tunable phototransistors operable in the spectral range from ultraviolet (UV) to mm-waves, as well as the entire infrared and THz region. This mechanism is based on resonant gating of graphene by the concentrated, dynamic electric fields of surface plasmon polaritons (SPPs) and it forms the basis for tunable, high-speed imaging arrays.
Technical Details
Within the graphene phototransistor, photodetection occurs through an innovative combination of two transduction steps. 1) Incident photons are instantly converted with high efficiency to SPPs. 2) The SPP fields produce a measurable perturbation on graphene transport, where high speed is anticipated due to graphene's high room-temperature carrier mobility and by potentially light-like speeds for information transfer via SPP propagation.
The graphene sheet is positioned at the surface of a suitable photon-to-SPP excitation coupler. The SPPs are excited at a specific angle of incidence for a given wavelength. The intense SPP fields, in turn, penetrate, gate, dynamically dope, and excite traveling waves of charge density in the graphene, causing changes in its conductance by a variety of potential mechanisms that are sensed electrically.
The University of Central Florida invention is a highly sensitive, broadly tunable detector for multi-domain sensing and quantum information systems. With a non-thermal “video” mechanism, the detector offers substantial single-photon sensitivity at high speeds when coupled to a suitable antenna. Josephson junctions in the UCF material feature high dynamic resistance at the maximum zero voltage current. Biased at this current, a small microwave voltage across the junction shifts the voltage-current step, resulting in a large DC output voltage. When driven by external radiation, the antenna can source the desired AC voltage across the junction. Additionally, the bolometric response has a temperature coefficient of resistance estimated at 300 percent/K.
Partnering Opportunity
The research team is seeking partners for licensing, research collaboration, or both.
