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Terahertz subwavelength sensing with bio-functionalized germanium fano-resonators

Chavarin, Carlos Alvarado ; Hardt, Elena ; Skibitzki, Oliver ; Voss, Thomas ; Eissa, Mohammed ; Spirito, Davide ; Capellini, Giovanni ; Baldassarre, Leonetta ; Flesch, Julia ; Piehler, Jacob ; You, Changjiang ; Grüssing, Sönke ; Römer, Friedhard ; Witzigmann, Bernd (2023)
Terahertz subwavelength sensing with bio-functionalized germanium fano-resonators.
In: Frequenz, 2022, 76 (11-12)
doi: 10.26083/tuprints-00023209
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Terahertz subwavelength sensing with bio-functionalized germanium fano-resonators
Language: English
Date: 1 March 2023
Place of Publication: Darmstadt
Year of primary publication: 2022
Journal or Publication Title: Frequenz
Volume of the journal: 76
Issue Number: 11-12
DOI: 10.26083/tuprints-00023209
Corresponding Links:
Origin: Secondary publication

Localized Surface Plasmon Resonances (LSPR) based on highly doped semiconductors microstructures, such as antennas, can be engineered to exhibit resonant features at THz frequencies. In this work, we demonstrate plasmonic antennas with increased quality factor LSPRs from Fano coupling to dark modes. We also discuss the advances in the biofunctionalization of n-doped Ge antennas for specific protein immobilization and cell interfacing. Finally, albumin biolayers with a thickness of a few hundred nanometers are used to demonstrate the performance of the fano-coupled n-Ge antennas as sensors. A resonant change of over 10% in transmission, due to the presence of the biolayer, can be detected within a bandwidth of only 20 GHz.

Uncontrolled Keywords: biosensing, fano resonances, semiconductor plasmonics, terahertz sensor
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-232099
Classification DDC: 500 Science and mathematics > 530 Physics
500 Science and mathematics > 570 Life sciences, biology
600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics (IMP)
Date Deposited: 01 Mar 2023 10:12
Last Modified: 28 Sep 2023 11:05
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/23209
PPN: 511929293
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