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Linear and Nonlinear Optical Properties of Mercaptoacetic Acid-Capped CdTe Nanoparticles by Z-Scan Technique

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Abstract:

CdTe nanocrystals were synthesized by wet chemical route using potassium tellurite and cadmium chloride as starting materials in the presence of mercaptoacetic acid (MAA) as capping agent at pH ≈ 11.2. The effect of precursors molar ratio on the synthesis of these nanocrystalline samples was measured using UV-Visible absorption, photoluminescence and nonlinear optical analysis. By increasing Cd/Te molar ratio the emission wavelength in the photoluminescence shifted to higher energies. The CdTe nanocrystallites have a radius of approximately 3.22 nm and interesting photophysical properties. Z-scan studies were carried out to measure the sign and magnitude of the optical nonlinearity of CdTe nanoparticles. The calculated values of n 2, β and χ (3) from Z-scan measurements are –5.45 × 10–9 cm2/W, –1.048 × 10–4 cm/W and 24.64 × 10–6 esu, respectively. The synthesized CdTe nanoparticles were characterized with XRD, FT-IR analysis and optical non- linearity studies and the results are discussed.

Keywords: CDTE NANOCRYSTALS; NONLINEAR MATERIALS; NONLINEAR REFRACTION INDEX; OPTICAL PROPERTIES; Z-SCAN TECHNIQUE AND FT-IR SPECTROSCOPY

Document Type: Short Communication

DOI: https://doi.org/10.1166/nnl.2011.1231

Publication date: 2011-10-01

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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