Photoluminescence Characterization of Cadmium Sulphide (CdS) Nanowires for Polarization Studies
| Autor: | Michael A. Stroscio, Shripriya Poduri, Mitra Dutta |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Pharmacology
Photoluminescence Materials science business.industry Nanowire Photodetector 02 engineering and technology Polarizer 010402 general chemistry 021001 nanoscience & nanotechnology Polarization (waves) 01 natural sciences 0104 chemical sciences law.invention symbols.namesake law Perpendicular symbols Optoelectronics 0210 nano-technology business Anisotropy Raman spectroscopy |
| Zdroj: | Applied Physics Research. 9:26 |
| ISSN: | 1916-9647 1916-9639 |
| DOI: | 10.5539/apr.v9n6p26 |
| Popis: | In this paper, the polarizing properties for CdS nanowire arrays were explored for their potential use in the design of nanowire based polarizers and optical switches. These free standing cadmium sulphide (CdS) nanowires were grown in anodized aluminum oxide (AAO) template via dc electrodeposition. Raman and photoluminescence (PL) measurements were investigated for parallel and perpendicular polarization with two orientations of the sample having light propagating parallel to the nanowire axis in one orientation and light propagating perpendicular to the nanowire axis in other orientation. Polarization-sensitive measurements show strong polarization anisotropy in the photoluminescence (PL) intensity measurements observed in parallel and perpendicular orientation to the long axis of a nanowire. The measured PL ratio, ρ, for parallel to perpendicular orientation was around 0.80- 0.85 which shows strong polarization anisotropy for the grown CdS nanowires. Strong peaks of A1 (TO) at 235 cm-1, E2 mode at 255 cm-1 along with 1 LO (longitudinal optical) at 303 cm-1, 2 LO peak at 604 cm-1 of the CdS nanowires were seen with different polarizations for Raman spectral studies. These polarization studies show that these dc electrodeposited grown CdS nanowire arrays are well suited for uses in polarization-based nanoscale devices such as in optical switches, and high performance photodetectors. |
| Databáze: | OpenAIRE |
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