Skip to main content
U.S. flag

An official website of the United States government

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.

Microfabricated bolometer based on a vertically aligned carbon nanotube absorber



Anna K. Vaskuri, Michelle S. Stephens, Nathan A. Tomlin, Christopher S. Yung, Andrew J. Walowitz, Cameron Straatsma, Dave Harber, John H. Lehman


We have designed a microfabricated planar absolute radiometer based on a vertically aligned carbon nanotube (VACNT) absorber and an electrical power substitution method. The radiometer is designed to operate at room temperature and to be capable of measuring laser powers up to 300 mW from 300 nm to 2300 nm with an expected expanded uncertainty of 0.06% (k = 2). The electrical power substitution capability makes the radiometer absolute and traceable to the international system (SI) of units. The new bolometer is currently under construction and will replace NIST's 50 year old detector standard for free-space CW laser power measurements. We also study the possibility of reducing background temperature sensitivity by optimizing the spectral selectivity of the VACNT forest with a photonic crystal structure.
Proceedings Title
Proceedings of SPIE
Conference Dates
February 1-6, 2020
Conference Location
San Francisco, CA
Conference Title
SPIE Photonics West LASE


Radiometer, bolometer, laser power, primary standard, background compensation, carbon nanotubes, photonic structure, spectral selectivity


Vaskuri, A. , Stephens, M. , Tomlin, N. , Yung, C. , Walowitz, A. , Straatsma, C. , Harber, D. and Lehman, J. (2020), Microfabricated bolometer based on a vertically aligned carbon nanotube absorber, Proceedings of SPIE, San Francisco, CA, [online], (Accessed April 12, 2024)
Created March 1, 2020, Updated October 5, 2020