Design and fabrication of plasmonic tuned THz detectors by periodic hole structures

摘要

We predict an extraordinary transmission (ET) of a periodic hole structure (PHS) by simulating plasmonic properties using finite difference time-domain Solutions. The ET effect is used to modulate the photoresponse by integrating the PHS into silicon-based blocked-impurity-band (BIB) terahertz detectors. The measured photoresponses of the experimentally realized PHS + BIB detectors confirm the tunability of photoresponses. Moreover, the electromagnetic field distribution is also simulated, which reveals that the prominent modulation effect originates from a strongly confined electromagnetic field. The response away from the resonance wavelength is largely suppressed. This work demonstrates the potential of our device in multi-spectral terahertz detection.