Nanoantenna-based ultrafast thermoelectric long-wave infrared detectors.
Journal
Scientific reports
ISSN: 2045-2322
Titre abrégé: Sci Rep
Pays: England
ID NLM: 101563288
Informations de publication
Date de publication:
10 Aug 2020
10 Aug 2020
Historique:
received:
26
03
2020
accepted:
20
07
2020
entrez:
12
8
2020
pubmed:
12
8
2020
medline:
12
8
2020
Statut:
epublish
Résumé
We investigate the generation of electrical signals by suspended thermoelectrically coupled nanoantennas (TECNAs) above a quasi-spherical reflector cavity in response to rapidly changing long-wave infrared radiation. These sensors use a resonant nanoantenna to couple the IR energy to a nanoscale thermocouple. They are positioned over a cavity, etched into the Si substrate, that provides thermal isolation and is designed as an optical element to focus the IR radiation to the antenna. We study the frequency-dependent response of such TECNAs to amplitude-modulated 10.6 μm IR signals. We experimentally demonstrate response times on the order of 3 μs, and a signal bandwidth of about 300 kHz. The observed electrical response is in excellent correlation with finite element method simulations based on the thermal properties of nanostructures. Both experiments and simulations show a key trade-off between sensitivity and response time for such structures and provide solutions for specific target applications.
Identifiants
pubmed: 32778703
doi: 10.1038/s41598-020-70062-6
pii: 10.1038/s41598-020-70062-6
pmc: PMC7417552
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
13429Subventions
Organisme : NASA
ID : 80NSSC20K0918
Pays : United States
Organisme : NSF CMMI
ID : 1947391
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