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Tunable cavity-enhanced terahertz frequency-domain optical Hall effect
Univ Nebraska, NE 68588 USA.
JA Woollam Co Inc, NE 68508 USA.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
Univ N Carolina, NC 28223 USA.
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2020 (English)In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 91, no 8, article id 083903Article in journal (Refereed) Published
Abstract [en]

Presented here is the development and demonstration of a tunable cavity-enhanced terahertz (THz) frequency-domain optical Hall effect (OHE) technique. The cavity consists of at least one fixed and one tunable Fabry-Perot resonator. The approach is suitable for the enhancement of the optical signatures produced by the OHE in semi-transparent conductive layer structures with plane parallel interfaces. Tuning one of the cavity parameters, such as the external cavity thickness, permits shifting of the frequencies of the constructive interference and provides substantial enhancement of the optical signatures produced by the OHE. A cavity-tuning optical stage and gas flow cell are used as examples of instruments that exploit tuning an external cavity to enhance polarization changes in a reflected THz beam. Permanent magnets are used to provide the necessary external magnetic field. Conveniently, the highly reflective surface of a permanent magnet can be used to create the tunable external cavity. The signal enhancement allows the extraction of the free charge carrier properties of thin films and can eliminate the need for expensive superconducting magnets. Furthermore, the thickness of the external cavity establishes an additional independent measurement condition, similar to, for example, the magnetic field strength, THz frequency, and angle of incidence. A high electron mobility transistor (HEMT) structure and epitaxial graphene are studied as examples. The tunable cavity-enhancement effect provides a maximum increase of more than one order of magnitude in the change of certain polarization components for both the HEMT structure and epitaxial graphene at particular frequencies and external cavity sizes.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2020. Vol. 91, no 8, article id 083903
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-169246DOI: 10.1063/5.0010267ISI: 000562837100001PubMedID: 32872950OAI: oai:DiVA.org:liu-169246DiVA, id: diva2:1466618
Note

Funding Agencies|National Science FoundationNational Science Foundation (NSF) [DMR 1808715]; Air Force Office of Scientific ResearchUnited States Department of DefenseAir Force Office of Scientific Research (AFOSR) [FA9550-18-1-0360]; Knut and Alice Wallenbergs FoundationKnut & Alice Wallenberg Foundation; Swedish Agency for Innovation Systems under the Competence Center Program [2016-05190, 2014-04712]; Swedish Foundation for Strategic ResearchSwedish Foundation for Strategic Research [RFI14-055, EM16-0024]; Swedish Research CouncilSwedish Research Council [2016-00889]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO Mat LiU) [2009 00971]; J. A. Woollam Foundation

Available from: 2020-09-12 Created: 2020-09-12 Last updated: 2023-12-28

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