Open AccessTransmission enhancement through a trench-surrounded nano metallic slit by bump reflectors
Author(s) -
C. M. Wang,
Hung I. Huang,
Chien Chang Chao,
Jenq Yang Chang,
Yunlong Sheng
Publication year - 2007
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.003496
Subject(s) - slit , optics , trench , materials science , extraordinary optical transmission , penetration depth , surface plasmon polariton , surface plasmon , penetration (warfare) , optoelectronics , physics , plasmon , layer (electronics) , nanotechnology , engineering , operations research
We propose using a pair of bumps bordering the conventional trench-surrounded metal nano slit in order to confine the surface waves and further enhance the slit transmission. The bump height of 1.mum is larger than the depth of penetration on air side of the surface waves. The reflectivity of such bumps is larger than 95%. A very large slit transmission, which is 50% of the energy of the incident beam impinging on the entire size 13.mum of the trench-surrounded slit structure, is obtained through the metallic slit of 50nm width and 400nm depth. The bumps enhance the transmission by 1.75 fold.