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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. (Publisher's Version)
In: Frequenz, 76 (11-12), pp. 639-650. ISSN 0016-1136,
DOI: 10.26083/tuprints-00023209,

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Item Type: Article
Origin: Secondary publication
Status: Publisher's Version
Title: Terahertz subwavelength sensing with bio-functionalized germanium fano-resonators
Language: English

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.

Journal or Publication Title: Frequenz
Volume of the journal: 76
Issue Number: 11-12
Place of Publication: Darmstadt
Uncontrolled Keywords: biosensing, fano resonances, semiconductor plasmonics, terahertz sensor
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
500 Naturwissenschaften und Mathematik > 570 Biowissenschaften, Biologie
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
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: 01 Mar 2023 10:13
DOI: 10.26083/tuprints-00023209
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-232099
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/23209
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