Jump to main content
Jump to site search

Issue 7, 2020
Previous Article Next Article

Bioinspired self-similar all-dielectric antennas: probing the effect of secondary scattering centres by Raman spectroscopy

Author affiliations

Abstract

All-dielectric optical antennas offer unique advantages in fabrication of highly reproducible Raman probes and light management at the meso- and nano-scale. Hot-spot engineering is a key step for enhancing the local field and promoting light channelling from far- to near-field. However, unlike the case of plasmonic antennas, hot-spot design and implementation in all-dielectric systems is still largely underdeveloped. Inspired by building-up principles that govern absorption, trapping and scattering of visible light in a variety of biological structures and guided by finite element optical simulations, here we explored the potential of self-similar dielectric optical antennas in light coupling with Mie-type modes. The systems investigated were based on the combination of primary and secondary antennas, made of micron- and nano-sized TiO2 nanoshells. Different types of configurations, including randomly and hierarchically organized antennas were tested. Raman experiments revealed that hierarchically ordered structures offer superior SERS performances in terms of field enhancement and reproducibility in comparison to the randomly arranged counterparts, which are in turn more efficient, yet less reproducible, than simple micro-sized antennas taken as a reference. These results open the door to further investigations in view of developing next-generation platforms for SERS and photocatalysis.

Graphical abstract: Bioinspired self-similar all-dielectric antennas: probing the effect of secondary scattering centres by Raman spectroscopy

Back to tab navigation

Supplementary files

Article information


Submitted
15 Jul 2020
Accepted
22 Sep 2020
First published
22 Sep 2020

This article is Open Access

Mater. Adv., 2020,1, 2443-2449
Article type
Paper

Bioinspired self-similar all-dielectric antennas: probing the effect of secondary scattering centres by Raman spectroscopy

I. Alessandri, L. Carletti, M. Ferroni, C. De Angelis and I. Vassalini, Mater. Adv., 2020, 1, 2443
DOI: 10.1039/D0MA00509F

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

Reproduced material should be attributed as follows:

  • For reproduction of material from NJC:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
  • For reproduction of material from PCCP:
    [Original citation] - Published by the PCCP Owner Societies.
  • For reproduction of material from PPS:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
  • For reproduction of material from all other RSC journals:
    [Original citation] - Published by The Royal Society of Chemistry.

Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.


Social activity

Search articles by author

Spotlight

Advertisements