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Disordered Nonlinear Metalens for Raman Spectral Nanoimaging
- Source :
- ACS applied materialsinterfaces. 12(3)
- Publication Year :
- 2020
-
Abstract
- Over the past decades, considerable progress has been made toward far-field optical imaging beyond the diffraction limit. However, most working proof-of-concepts are based on either time-consuming scanning of a subdiffraction focal spot over a sample or postrecovery treatment using a priori information on a sought image. To our knowledge, none of these can be regarded as being close to a perfect far-field superlensing system capable of real-time color imaging with subwavelength resolution. In this paper, we suggest a proof-of-concept for far-field nonlinear metalens that is made of a disordered metal–dielectric nanocomposite. Postoxidation of a refractory titanium nitride (TiN) thin film, used as a nonlinear plasmonic material, results in the formation of a titanium oxynitride (TiON) film comprising a mixture of multiple phases of TiOxNy. Due to a double epsilon-near-zero behavior near the percolation threshold, the TiON favors supercoupling of the incident light to surface plasmon resonance within the vi...
- Subjects :
- Diffraction
Materials science
business.industry
Percolation threshold
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Ray
symbols.namesake
0103 physical sciences
symbols
Optoelectronics
General Materials Science
Thin film
Surface plasmon resonance
010306 general physics
0210 nano-technology
business
Raman spectroscopy
Plasmon
Raman scattering
Subjects
Details
- ISSN :
- 19448252
- Volume :
- 12
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- ACS applied materialsinterfaces
- Accession number :
- edsair.doi.dedup.....94be7a51da76b2203074d9f551674643