Design and characterization of terahertz-absorbing nano-laminates of dielectric and metal thin films
Lavrik, Nickolay V
MetadataShow full item record
A terahertz-absorbing thin-film stack, containing a dielectric Bragg reflector and a thin chromium metal film, was fabricated on a silicon substrate for applications in bi-material terahertz (THz) sensors. The Bragg reflector is to be used for optical readout of sensor deformation under THz illumination. The THz absorption characteristics of the thin-film composite were measured using Fourier transform infrared spectroscopy. The absorption of the structure was calculated both analytically and by finite element modeling and the two approaches agreed well. Finite element modeling provides a convenient way to extract the amount of power dissipation in each layer and is used to quantify the THz absorption in the multi-layer stack. The calculation and the model were verified by experimentally characterizing the multi-layer stack in the 3-5 THz range. The measured and simulated absorption characteristics show a reasonably good agreement. It was found that the composite film absorbed about 20% of the incident THz power. The model was used to optimize the thickness of the chromium film for achieving high THz absorption and found that about 50% absorption can be achieved when film thickness is around 9 nm.
The article of record as published may be found at http://dx.doi.org/10.1364/OE.18.014488
Showing items related by title, author, creator and subject.
Design and characterization of terahertz-absorbing nano-laminates of dielectric and metal thin films Bolakis, C.; Grbovic, D.; Lavrik, N.V.; Karunasiri, G. (2010-07);A terahertz-absorbing thin-film stack, containing a dielectric Bragg reflector and a thin chromium metal film, was fabricated on a silicon substrate for applications in bi-material terahertz (THz) sensors. The Bragg reflector ...
Go, Han Suk (Monterey, California. Naval Postgraduate School, 1990-09);There has been a growing and widespread interest in radar-absorbing material technology. As the name implies, radar absorbing materials or RAM's are coatings whose electric and magnetic properties have been selected to ...
Jenkins, Natalie; Petty, Clayton; Phillips, Jonathan (2016-02-20);A constant current charge/discharge protocol which showed fumed silica filled to the point of incipient wetness with aqueous NaCl solution to have dielectric constants >10 ⁸ over the full range of dielectric thicknesses ...