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Self-assembled ErAs:GaAs nano-island superlattices have recently been demonstrated as
potential photoconductive antennas (see Figure 2.7). The ErAs:GaAs based detector
shows a strong enhancement in THz detection efficiency with respect to incident optical
power, though optical saturation occurs more rapidly. Detected THz bandwidth and
signal-to-noise ratios are simultaneously maintained or improved.
Figure 2.7 Illustration of ErAs:GaAs based THz detector. Figure Source:
http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=APPLAB00008800
0025251119000001&idtype=cvips&prog=normal
The interaction between CNT and potassium ions could potentially be exploited for room
temperature THz detection. A team at the Beckman Institute for Advanced Science and
Technology, University of Illinois, has shown that potassium ions binding strongly with a
CNT induce a dielectric field in the CNT and oscillate at a frequency of about 0.4 THz.
This “nano oscillator” may serve as a THz wave detector which can operate at room
temperature (Schulten et al., 2005, see Figure 2.8).
Figure 2.8 Nano-oscillator: The nanotube is coloured according to initial atomic partial charges
q0. Blue (H): positive; red (C1): negative.
Source:
http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PRLTAO0000950000242468
01000001&idtype=cvips&prog=normal
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