Numerical Design of Photonic Crystal-Based Nanostructured Substrate for Efficient Surface-Enhanced Raman Scattering
| Autor: | Richa Goel, Satish Kumar Dubey, Padmnabh Rai, Vimarsh Awasthi |
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| Rok vydání: | 2020 |
| Předmět: |
Excitation wavelength
Nanostructure Fabrication Explosive material business.industry Detector Biophysics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Biochemistry 010309 optics symbols.namesake Numerical design 0103 physical sciences symbols Optoelectronics 0210 nano-technology business Raman scattering Biotechnology Photonic crystal |
| Zdroj: | Plasmonics. 16:107-114 |
| ISSN: | 1557-1963 1557-1955 |
| DOI: | 10.1007/s11468-020-01268-7 |
| Popis: | Surface-enhanced Raman scattering (SERS) has emerged as a sensitive and established spectroscopic technique for trace detection in various fields including chemistry, material science, biochemistry, and life sciences. With the rapid progress in nano-fabrication scheme, design of SERS substrate has immensely contributed in the development of biological and biomedical sensors, detectors for explosives and narcotics, besides other applications. The electromagnetic enhancement, which majorly contributes to the SERS phenomena, is enabled by the fabrication of nanostructured substrates with high enhancement factor. The enhancement factor depends on the shape, size, and orientation of the nanostructure pattern. Here, we present a new design that ensures high enhancement factor (~ 107), is polarization independent, robust with respect to various geometrical parameters and excitation wavelength. It can be easily implemented in reflection mode configuration and is spread over a hotspot region of ~ 3200 nm2 (in each periodic unit of the array), yielding an overall emission efficiency of 0.12%. The proposed design can be realized for various SERS applications due to ease of its fabrication using standard techniques. |
| Databáze: | OpenAIRE |
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