Publication detail

Surface Protection and Activation of Mid-IR Plasmonic Waveguides for Spectroscopy of Liquids

DAVID, M. DOGANLAR, I. NAZZARI, D. ARIGLIANI, E. WACHT, D. SISTANI, M. DETZ, H. RAMER, G. LENDL, B. WEBER, W. STRASSER, G. HINKOV, B.

Original Title

Surface Protection and Activation of Mid-IR Plasmonic Waveguides for Spectroscopy of Liquids

Type

journal article in Web of Science

Language

English

Original Abstract

Liquid spectroscopy in the mid-infrared spectral range is a very powerful, yet premature technique for selective and sensitive molecule detection. Due to the lack of suitable concepts and materials for versatile miniaturized sensors, it is often still limited to bulky systems and offline analytics. Mid-infrared plasmonics is a promising field of current research for such compact and surface-sensitive structures, enabling new pathways for much-needed photonic integrated sensors. In this work, we focus on extending the concept of Ge/Au-based mid-infrared plasmonic waveguides to enable broadband liquid detection. Through the implementation of high-quality dielectric passivation layers deposited by atomic layer deposition (ALD), we cover the weak and water-soluble Ge native oxide. We show that approximately 10 nm of e.g. Al2O3 or ZrO2 can already protect the plasmonic waveguides for up to 90 min of direct water exposure. This unlocks integrated sensing schemes for broadband molecule detection based on mid-infrared plasmonics. In a proof-of-concept experiment, we further demonstrate that the ZrO(2 )coated waveguides can be activated by surface functionalization, allowing the direct measurement of diethyl ether at a wavelength of 9.38 mu m.

Keywords

Plasmons; Surface waves; Optical waveguides; Germanium; Dielectrics; Sensors; Quantum cascade lasers; liquid spectroscopy; mid-infrared plasmonics; photonic integrated circuits; surface functionalization; waveguide passivation

Authors

DAVID, M.; DOGANLAR, I.; NAZZARI, D.; ARIGLIANI, E.; WACHT, D.; SISTANI, M.; DETZ, H.; RAMER, G.; LENDL, B.; WEBER, W.; STRASSER, G.; HINKOV, B.

Released

15. 1. 2024

Publisher

IEEE

Location

PISCATAWAY

ISBN

1558-2213

Periodical

JOURNAL OF LIGHTWAVE TECHNOLOGY

Year of study

42

Number

2

State

United States of America

Pages from

748

Pages to

759

Pages count

12

URL

https://ieeexplore.ieee.org/document/10268011

Full text in the Digital Library

http://hdl.handle.net/11012/249397

BibTex

@article{BUT188947,
  author="Mauro {David} and Ismael C. {Doganlar} and Daniele {Nazzari} and Elena {Arigliani} and Dominik {Wacht} and Masiar {Sistani} and Hermann {Detz} and Georg {Ramer} and Bernhard {Lendl} and Walter M. {Weber} and Gottfried {Strasser} and Borislav {Hinkov}",
  title="Surface Protection and Activation of Mid-IR Plasmonic Waveguides for Spectroscopy of Liquids",
  journal="JOURNAL OF LIGHTWAVE TECHNOLOGY",
  year="2024",
  volume="42",
  number="2",
  pages="748--759",
  doi="10.1109/JLT.2023.3321034",
  issn="1558-2213",
  url="https://ieeexplore.ieee.org/document/10268011"
}