Patra, Pritha and Gangareddy, Jagannath and Soma, Venugopal Rao and Kalyandurg , Annapurna (2025) Fabrication of Te-nanoparticle Embedded Tellurite Glass for Optical Limiting Application. In: 27th International Congress on Glass (ICG) 2025, 20-24 January 2025, CSIR CGCRI, Kolkata. (Submitted)

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Abstract

In recent times, elementary Tellurium (Te0) has gained major attention in the field of nanotechnology because of its unconventional properties such as photoconductivity, thermoelectricity, photothermal conversion and optical non-linearity.1Reduction of Te4+ to Te0 leads increase in refractive index (RI) of the matrix, thusenabling waveguide fabrication and 3D-data storage.2However, uncontrolled formation of Te particles throughout the glassy matrix can cause darkening, thereby reducing optical transparency, which is undesirable for further optical applications. In view of that,present study aims to fabricatea thin layer of Te-nanoparticles (Te-NPs) on the TeO2 glass surface through a heat-treatment under reducing atmosphere.The formation of Te-NPs has been confirmed through XRD and Raman Spectra. The FE-SEM microstructural studydisplaysthe formation of 10-15 nm size NPs on the surface of the tellurite glass (Figure 1). The thickness of the Te-nanoparticle layer has been measuredusing prism coupler, which is found to be ~350-400 nm.Hence, this controlled precipitation of uniform Te NPs layer on the glass surface under the optimized heat-treatment schedule has retained the transparency of the matrix for photonic applications. Third-order optical nonlinearity of the ‘TeNPs@TeO2 glass’ composite has been measured using the Z-scan technique (under femtosecond pulse laser excitation) at 800-1200 nm wavelength region, exhibiting enhancement of non-linear optical (NLO) co-efficient compared to their parent glasses and glass-ceramics. The maximum NLO co-efficient is evidenced from5 h heat-treated matrix exhibiting two photon absorption co-efficient (α2) of 1.5×10-10 m/W, non-linear refractive index (n2) of 1.315×10-17 m2/W, and optical limiting threshold of 7 mJ/cm2. The limiting threshold is farlower than the reported optical limiting materials till now. Based on the result, it can be concluded that prepared Te NPs@TeO2 glass’ composite has great potential as an optical limiter.

Item Type:	Conference or Workshop Item (Poster)
Subjects:	Glass > Glass Properties Glass
Divisions:	Glass
Depositing User:	Ms Upasana Sahu
Date Deposited:	01 Sep 2025 11:30
Last Modified:	01 Sep 2025 11:30
URI:	http://cgcri.csircentral.net/id/eprint/5761

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