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Tunable wide-band graphene plasmonic nano-color-sorter: Application in scanning near-field optical microscopy

Heydarian, H ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1364/JOSAB.36.000435
  3. Publisher: OSA - The Optical Society , 2019
  4. Abstract:
  5. Tunability of the Fermi level of graphene is exploited to implement a plasmonic nano-color-sorter for scanning near-field optical microscope (SNOM) applications capable of handling large tip sample couplings. Nano-color-sorting has been used in SNOM through creating multiple spatially separated hot spots for different incident wavelengths. We show that in the presence of high-refractive-index samples an unwanted redshift in the spectral response of the dual-color probe occurs. This limitation can be compensated for using graphene and adjusting its chemical potential to obtain a blueshift in probe spectral response. The Method of Moments analysis technique is employed to engineer the probe numerically. This probe is tuned to work at standard Nd:YAG laser lines (1054 and 1319 nm) and achieve sub-wavelength resolution as small as 0.002λ 2 . © 2019 Optical Society of America
  6. Keywords:
  7. Color ; Graphene ; Method of moments ; Neodymium lasers ; Plasmonics ; Plasmons ; Probes ; Refractive index ; Yttrium aluminum garnet ; Analysis techniques ; Color sorting ; High refractive index ; Incident wavelength ; ND : YAG lasers ; Spectral response ; Subwavelength resolution ; Tunabilities ; Near field scanning optical microscopy
  8. Source: Journal of the Optical Society of America B: Optical Physics ; Volume 36, Issue 2 , 2019 , Pages 435-442 ; 07403224 (ISSN)
  9. URL: https://www.osapublishing.org/josab/abstract.cfm?uri=josab-36-2-435