Efficient real-time detection of terahertz pulse radiation based on photoacoustic conversion by carbon nanotube nanocomposite

Sung Liang Chen, You-Chia Chang, Cheng Zhang, Jong G. Ok, Tao Ling, Momchil T. Mihnev, Theodore B. Norris, L. Jay Guo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

Terahertz sensing plays an important role in industry, biology and material science. Most existing techniques for terahertz detection either require bulky optics or need cryogenic cooling, and the uncooled thermal detectors usually suffer from long integration times (1-1,000 ms). We propose, and experimentally demonstrate, a novel scheme based on photoacoustic detection of terahertz pulse radiation. The transient and localized heating in a carbon nanotube-polymer composite by the absorption of terahertz pulse energy produces ultrasound, which is subsequently detected by a highly sensitive acoustic sensor. In contrast to conventional thermal detectors utilizing continuous heat integration, this new method of terahertz detection responds to the energy of each individual terahertz pulse by a time-gated scheme, thus rejecting the continuous radiation from the ambient. In addition, this novel detector possesses advantages such as room-temperature operation, a fast response (∼1/40.1 μs) allowing real-time detection, compact size (millimetre scale) and wide spectral response.

Original languageEnglish
Pages (from-to)537-542
Number of pages6
JournalNature Photonics
Volume8
Issue number7
DOIs
StatePublished - 1 Jan 2014

Fingerprint Dive into the research topics of 'Efficient real-time detection of terahertz pulse radiation based on photoacoustic conversion by carbon nanotube nanocomposite'. Together they form a unique fingerprint.

Cite this