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Light localization and SERS in tip-shaped silicon metasurface
Optics Express
|August 10, 2017
Summary
Silicon micro-cone metasurfaces enhance optical fields, leading to stronger Raman signals. These dielectric metasurfaces show potential as efficient substrates for surface-enhanced Raman spectroscopy (SERS).
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Two-dimensional periodic systems of silicon micro-cones form dielectric metasurfaces.
- These metasurfaces exhibit enhanced local optical fields due to dielectric resonances.
Purpose of the Study:
- Investigate the optical properties of silicon micro-cone metasurfaces.
- Explore their potential as substrates for surface-enhanced Raman spectroscopy (SERS).
Main Methods:
- Finite element computer simulations.
- Experimental verification.
- Deposition of signal molecules (DTNB acid) and gold nanoparticles on the metasurface.
Main Results:
- Observed anomalous optical response attributed to dielectric resonances within the silicon cones.
- Demonstrated significant enhancement of local electric fields, exceeding those in typical surface plasmon resonances.
- Showcased enhanced electromagnetic fields and Raman signals from DTNB acid molecules complexed with gold nanoparticles.
Conclusions:
- Silicon micro-cone metasurfaces effectively enhance optical fields and Raman signals.
- These dielectric metasurfaces possess quasi-continuous spectra and are promising for SERS applications.
