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Spectroscopic Techniques for Optical Sensing
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Spectroscopic Techniques for Optical Sensing

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Optical Sensors".

Deadline for manuscript submissions: 31 August 2025 | Viewed by 377

Special Issue Editor

Prof. Dr. Werner Mäntele

E-Mail Website
Guest Editor
Institut fuer Biophysik, Goethe-University Frankfurt am Main, Max-von-Laue-Straße 1, 60438 Frankfurt, Germany
Interests: biophysics; molecular spectroscopy; medical physics; analytics; medical technology; spectroscopic sensors
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The rapid advancement of the development of powerful and tunable optical sources and detectors essentially based on semiconductors has facilitated new opportunities for optical sensing techniques and applications. With these processes, miniaturization, integration, and, eventually, mass fabrication go hand in hand. Spectroscopic techniques previously bound to laboratory settings are now viable in mobile or field applications. Spectral ranges, such as the mid-infrared, that previously had to be connected to laboratory devices can now be implemented in a handheld form factor. Applications range from optical sensors for chemical analysis in industry to environmental monitoring and medical applications.

This 2025 Special Issue of the journal Sensors, entitled “Spectroscopic Techniques for Optical Sensing”, will focus on all aspects regarding research, developments, and applications related to this area. Original research papers on the development of sources, optical interfaces, detectors, and signal processing for sensors, as well as short reviews that provide a state-of-the art overview on specific aspects, are welcome. We invite you to submit your contributions to this Special Issue.

Prof. Dr. Werner Mäntele
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • semiconductor sources (from the UV to the far-infrared)
  • optical fibers and interfaces for sensors
  • sensor specificity, sensitivity and stability
  • sensors for gases, liquids and solids
  • environmental sensors
  • sensors in biotechnology
  • sensors in chemical industry
  • biomedical sensors

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Published Papers (1 paper)

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Research

14 pages, 21375 KiB  
Article
A Very Thin MCT Film in HDVIP Achieves High Absorption
by Lingwei Jiang, Changhong Sun, Xiaoning Hu, Ruijun Ding and Chun Lin
Sensors 2025, 25(12), 3701; https://doi.org/10.3390/s25123701 - 13 Jun 2025
Viewed by 228
Abstract
Compared to the traditional flip-chip bonded focal plane array, in high-density vertically integrated photodiode (HDVIP) focal plane technology, the thickness of the mercury cadmium telluride (MCT or Hg1−xCdxTe) layer serves as a more critical parameter. This parameter not only [...] Read more.
Compared to the traditional flip-chip bonded focal plane array, in high-density vertically integrated photodiode (HDVIP) focal plane technology, the thickness of the mercury cadmium telluride (MCT or Hg1−xCdxTe) layer serves as a more critical parameter. This parameter not only influences the efficiency of photon energy absorption but also defines the pn junction area, thereby affecting the magnitude of the dark current. Furthermore, it significantly impacts the manufacturability of via-hole etching and formation processes. This paper investigated the photonic crystal resonances and coherent perfect absorption (CPA) effect of a thin MCT layer in HDVIP by using COMSOL Multiphysics® 4.3b and optimized the structure of the loop-hole photodiode device. The CPA, which is formed by this structure, achieves high absorption of illumination in a very thin MCT film. It is demonstrated that an absorption rate of infrared radiation of more than 95% with a wavelength during the 8 µm–10 µm range can be achieved in Hg1−xCdxTe (x = 0.225) with a thickness of only 1.5 µm–3 µm. The benefit of thinner MCT film is that it decreases the dark current of pn junction and reduces the technical difficulty of etching and metallization of the loop-hole photodiode. Full article
(This article belongs to the Special Issue Spectroscopic Techniques for Optical Sensing)
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