NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
We describe a novel class of millimeter-wave and terahertz monochrometers based on adiabatically tuned frequency-selective surfaces. They are analogous to the circular-variable filters commonly used in the infrared for low to moderate resolution spectroscopy, and are well adapted for hyperspectral imaging of explosives, bioagents, and other solid materials that display broad but distinct spectral features in the submillimeter wavelength band. Low-cost fabrication techniques based on copper-on-kapton "flex" circuitboard materials and patterning enable operation to approximately 800 GHz and coverage of areas greater than 0.5 x 0.5 m. Higher frequency operation can be obtained with wafer-based photolithography and standard micromachining techniques. Octave-band prototypes covering 110-220 and 220-440 GHz show resolving powers of >6, presently limited by beamsize in the measurement setup, and insertion loss <0.5 dB.
Proceedings Title
ESA Workshop on Millimetre-wave Technology and Applications
Grossman, E.
, Dietlein, C.
and Luukanen, A.
(2006),
Terahertz circular variable filters, ESA Workshop on Millimetre-wave Technology and Applications, Espoo, FI, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=32224
(Accessed October 21, 2025)