Eradicating Backscattering through Circular Conversion Dichroism in Optical Regime

Ahsan Sarwar Rana, Sumbel Ijaz, Muhammad Atif Khan, Yehia Massoud

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Circular dichroism (CD) and asymmetric transmission (AT) are two outstanding chiroptical effects, which can be produced by planar chiral devices due to their distinct response to oppositely handed input light. The chiroptical effects have so far been used in realization of different applications including chiral imaging and sensing. This research realizes CD in the optical regime to attain AT for an optical wavelength regime by employing a supercell of hydrogenated amorphous Silicon nano-bars. The supercell is made of four achiral nanofins which are engineered in such a way that they exhibit a notable CD and AT. The design successfully achieves a CD of 55% and that of AT of 58% at the operating wavelength of 633 nm. The supercell absorbs the right circularly polarized light and transmits left circularly polarized light, thus behaving as a perfect circular polarization wave isolator i.e. the presented design can completely eradicate backscattering by minimizing reflectance.

Original languageEnglish (US)
Title of host publicationAdvanced Optical Imaging Technologies VI
EditorsXiao-Cong Yuan, P. Scott Carney, Kebin Shi
ISBN (Electronic)9781510667815
StatePublished - 2023
EventAdvanced Optical Imaging Technologies VI 2023 - Beijing, China
Duration: Oct 14 2023Oct 15 2023

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceAdvanced Optical Imaging Technologies VI 2023


  • backscattering
  • Circular Conversion Dichroism
  • cross-polarization coefficient

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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