(INVITED) Methods for determining the refractive indices and thermo-optic coefficients of chalcogenide glasses at MIR wavelengths

Fang, Yuting; Furniss, David; Jayasuriya, D.; Parnell, Harriet; Tang, Zhuoqi; Gibson, Dan; Bayya, Shyam; Sanghera, Jasbinder S.; Seddon, Angela B.; Benson, T.M.

doi:10.1016/j.omx.2019.100030

Cited by 9 publications

(12 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The refractive index variation and the transmittance profiles of TNT-MIP (D) and (C) films before TNT extraction, evaluated in the 200-1000 nm wavelength range against their corresponding NIPs, are given in Figure 3a,b respectively. For fitting the experimental ellipsometry data, the Cauchy Model for the transparent area was used [51]. This method allowed for simultaneous evaluation of the films' thicknesses.…”

Section: Spectroscopy Results For the Films Deposited On Glass Slidesmentioning

confidence: 99%

Biomimetic Sensitive Elements for 2,4,6-Trinitrotoluene Tested on Multi-Layered Sensors

et al. 2020

View full text Add to dashboard Cite

In spite of technological progress, most of the current techniques for 2,4,6-trinitrotoluene (TNT) detection are time consuming due to laborious sensor preparation. Thereby, the aim of this work was to enlarge the knowledge for preparing sensitive elements for TNT with the aid of molecular imprinting; a known technique used to deliver biomimetic materials. The study first depicts the auto-assembly mechanism of (TNT) with functional diamino-silanes (i.e., N-(2-aminoethyl)-3-aminopropyl methyl dimethoxysilane), via “double” Meisenheimer complexes. This mechanism is being described herein for the first time and applied further to obtain molecularly imprinted polymer (MIP) films for TNT recognition. For testing the potential application of films as chemical sensor elements, typical rebinding assays of TNT in a liquid state and the rebinding of TNT in a vapor state, using multilayered sensor chips composed of quartz-chromium (Cr)-gold (Au)-titanium oxide (TiO2), were employed. Batch rebinding experiments have shown that thinner films were more efficient on retaining TNT molecules in the first five min, with a specificity of about 1.90. The quartz-Cr-Au-TiO2-MIP capacitive sensors, tested in vapor state, registered short response times (less than 25 s), low sensitivity to humidity and high specificity for TNT.

show abstract

Section: Spectroscopy Results For the Films Deposited On Glass Slidesmentioning

confidence: 99%

Biomimetic Sensitive Elements for 2,4,6-Trinitrotoluene Tested on Multi-Layered Sensors

et al. 2020

View full text Add to dashboard Cite

show abstract

“…5 , 6 , 7 ), the refractive indices tend progressively to a kind of plateau. The latter gives therefore an estimation of the refractive indices in the MIR range up to multi-phonons absorption appearing at significantly higher wavelengths than NIR 45 , 46 . Therefore, the study of optical properties in the visible-NIR range is the best compromise in order to get an estimation of refractive indices from visible to MIR range as well as giving an estimation of the optical band gap energy from absorption measurements or ellipsometry data fitting models (see “ Methods ” and Sect.…”

Section: Resultsmentioning

confidence: 99%

Ge–Sb–S–Se–Te amorphous chalcogenide thin films towards on-chip nonlinear photonic devices

Dory

Castro-Chavarria

Verdy

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Thanks to their unique optical properties Ge–Sb–S–Se–Te amorphous chalcogenide materials and compounds offer tremendous opportunities of applications, in particular in near and mid-infrared range. This spectral range is for instance of high interest for photonics or optical sensors. Using co-sputtering technique of chalcogenide compound targets in a 200 mm industrial deposition tool, we show how by modifying the amorphous structure of GeSb w S x Se y Te z chalcogenide thin films one can significantly tailor their linear and nonlinear optical properties. Modelling of spectroscopic ellipsometry data collected on the as-deposited chalcogenide thin films is used to evaluate their linear and nonlinear properties. Moreover, Raman and Fourier-transform infrared spectroscopies permitted to get a description of their amorphous structure. For the purpose of applications, their thermal stability upon annealing is also evaluated. We demonstrate that depending on the GeSb w S x Se y Te z film composition a trade-off between a high transparency in near- or mid-infrared ranges, strong nonlinearity and good thermal stability can be found in order to use such materials for applications compatible with the standard CMOS integration processes of microelectronics and photonics.

show abstract

“…thermal history. Techniques developed and used by us for measuring the refractive index of chalcogenide glass compositions synthesised in Nottingham, and their temperature dependence, are summarised in [10] All the above measurements reveal the key material properties that are required for supportive optical modelling and simulation work.…”

Section: Chalcogenide Glassesmentioning

confidence: 99%

Mid-infrared sources for biomedical applications based on chalcogenide glass fibres

Seddon

Sujecki

Sójka

et al. 2020

Fiber Lasers and Glass Photonics: Materials Through Applications II

View full text Add to dashboard Cite

Many important molecules show strong characteristic vibrational transitions in the mid-infrared (MIR) part of the electromagnetic spectrum. This leads to applications in spectroscopy, chemical and bio-molecular sensing, security and industry, especially over the mid-and long-wave infrared atmospheric transmission windows of 3-5 μm and 8-13 μm.In this paper, we review some of our more recent experimental and simulation work aimed at developing new light sources based on chalcogenide glass optical fibres that can help us utilize this spectral region for biomedical applications. This includes the development of supercontinuum and bright luminescent sources and our progress towards fibre-based lasers. We place these developments in the context of MIR imaging and spectroscopy in order to show how they bring the promise a new era in healthcare and clinical diagnostics.

show abstract

(INVITED) Methods for determining the refractive indices and thermo-optic coefficients of chalcogenide glasses at MIR wavelengths

Cited by 9 publications

References 62 publications

Biomimetic Sensitive Elements for 2,4,6-Trinitrotoluene Tested on Multi-Layered Sensors

Biomimetic Sensitive Elements for 2,4,6-Trinitrotoluene Tested on Multi-Layered Sensors

Ge–Sb–S–Se–Te amorphous chalcogenide thin films towards on-chip nonlinear photonic devices

Mid-infrared sources for biomedical applications based on chalcogenide glass fibres

Contact Info

Product

Resources

About