Hybrid Au-Ag subwavelength metallic structures with variant periods for superfocusing

Yongqi Fu; Wei Zhou

doi:10.1117/1.3159299

1 June 2009 Hybrid Au-Ag subwavelength metallic structures with variant periods for superfocusing

Yongqi Fu, Wei Zhou

Author Affiliations +

Journal of Nanophotonics, Vol. 3, Issue 1, 033504 (June 2009). https://doi.org/10.1117/1.3159299

Abstract

A hybrid Au-Ag subwavelength metallic zone plate-like structure was put forth for the purpose of preventing oxidation and sulfuration of Ag film, as well as realizing superfocusing. The Au film acts as both a protector and modulator in the structure. Focusing performance is analyzed by means of three-dimensional finite-difference and time-domain (FDTD) algorithm-based computational numerical calculation. It can be tuned by varying thicknesses of both Au and Ag thin films. Our calculation results show that thickness difference between the Au and Ag thin films plays an important role for transmission spectra. Ratio of Au to Ag film thicknesses, h_Au/h_Ag is proportional to the relevant peak transmission intensity. In case of h_Au≈h_Ag=50 nm, both transmission intensity and focusing performance are improved. In addition, the ratio h_Au/h_Ag strongly influences position of peak wavelengths λAu and λAg generated from beaming through the metallic structures.

Citation Download Citation

Yongqi Fu and Wei Zhou "Hybrid Au-Ag subwavelength metallic structures with variant periods for superfocusing," Journal of Nanophotonics 3(1), 033504 (1 June 2009). https://doi.org/10.1117/1.3159299

Published: 1 June 2009

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available