Terahertz wave-molecule interactions via CMOS chips : from comb gas sensor with absolute specificity to ultra-stable, miniaturized clock

Under the excitation of electromagnetic waves within the millimeter wave and terahertz regimes, polar gaseous molecules generate unique rotational spectra. The frequency and absorption intensity of rotational spectral lines are directly linked to the micro-scale molecular structures. They serve as an indicator or "finger-print" of molecules. Thus, a rotational spectrometer with absolute specificity is promising for the analysis of complicated gas mixtures (e.g. human exhaled breath and industrial gas leakage). To utilize this important property, a CMOS dual-frequency-comb spectrometer is proposed and implemented. Broadband (220~320GHz), fast scanning (20x faster than conventional single-tone sensors) and highly sensitive (ppm level without pre-concentration) gas analysis is accomplished with the adoption of a high-parallelism architecture and multi-functional, highly-efficient circuit topologies.

Name thesis:degree_name

Doctoral

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2020

Author dc:creator

• Wang, Cheng,Ph.D.Massachusetts Institute of Technology.

Advisor dc:contributor.advisor

• Ruonan Han.

• Electrical Engineering and Computer Science.

Statement dc:rights

• MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/128330

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/128330