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Enhanced absorption in a graphene embedded 1D guided-mode-resonance structure without back-reflector and interferometrically written gratings

Enhanced absorption in a graphene embedded 1D guided-mode-resonance structure without back-reflector and interferometrically written gratings

Authors :
Jian Yi Pae
Vadakke Matham Murukeshan
Pankaj K. Sahoo
School of Mechanical and Aerospace Engineering
Center for Optical and Laser Engineering
Singapore Centre for 3D Printing
Source :
Optics letters. 44(15)
Publication Year :
2019

Abstract

A theoretical model based on the coupled mode theory is presented to calculate the absorption in a graphene embedded 1D guided-mode-resonance (GMR) structure that does not require a back reflector. The optimized graphene-GMR structure can absorb up to 70% of the incident light which far exceeds the already reported results without using any back-metal reflector or Bragg mirror. The theoretical analysis is valid for binary gratings and pyramidal gratings which are patterned using an interference lithography system. We experimentally validate our theoretical results and analyze the influence of the geometrical parameters to achieve critical coupling for the enhanced absorption. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) EDB (Economic Devt. Board, S’pore) Accepted version

Details

ISSN :
15394794
Volume :
44
Issue :
15
Database :
OpenAIRE
Journal :
Optics letters
Accession number :
edsair.doi.dedup.....bfa83087eddf57bf824ebf9e4f47e0fc