Electronically Tunable Terahertz Electronically Tunable Terahertz - - PowerPoint PPT Presentation
Electronically Tunable Terahertz Electronically Tunable Terahertz Detector Using Plasmons Plasmons Detector Using Jess Crossno Physics Santa Barbara City College Mentor: Greg Dyer Research Advisor: Dr. Jim Allen Undergraduate Researchers:
Jess Crossno Physics Santa Barbara City College Mentor: Greg Dyer Research Advisor: Dr. Jim Allen Undergraduate Researchers: Sean Haney, Bill Sowerwine
In Partnership with:
Technology Gap: Gap between Electronics and Photonics. Electronics fail to produce adequate power above several hundred GHz Photonics fail to produce adequate power below several THz
*THz = Terahertz = 1 Trillion Cycles per second
Technology applications Information Ultra fast signal processing Massive data transmission Environment Atmospheric sensing Defense Chemical/Biological agent
detection
Digital radar Imaging Covert communication Space-space Short range battle field Unknown applications created
by new technology
Millimeter-wave radar images taken 9 km from a nuclear power plant can detect when the plant is
http:// http://www.thznetwork.org www.thznetwork.org
Research and develop terahertz electronics
Objectives:
Nanoelectronics for THz sources and detectors. Detectors Tunable detectors for THz using plasmonic
Sources THz Bloch oscillator.
Electron Density
Source Drain Grating gates Finger Gate AlGaAs GaAs Source Drain Grating gates Finger Gate
4uM 4uM | |----
|
1mm
FET
Source/Drain Current Wiring Temperature Frequency Range
0 .0 2 .0 µ 4 .0 µ 6 .0 µ 8 .0 µ 1 0 .0 µ
0 .0 0 0 0 .0 0 5
V o lta g e R e sp o n s e G a te V o lta g e -5 0 0 m V C u rre n t 1 0 u A Voltage (V) T im e b a se (s)
10 20
0.0 0.2 0.4 1E-6 1E-5 1E-4
Signal response and relax tim e vs current Vg: -500 m V, 20 K
Signal Response (Unitless) Current (uA) Relaxation time (s)
FEL .48 THz FEL .48 THz
Polarization
Diagram
0.6 THz image