Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
Journal Home About Issues in Progress Current Issue All Issues Feature Issues

Subwavelength light bending by metal slit structures

Tae-Woo Lee and Stephen K. Gray

Open Access Open Access

Abstract

We discuss how light can be efficiently bent by nanoscale-width slit waveguides in metals. The discussion is based on accurate numerical solutions of Maxwell’s equations. Our results, using a realistic model for silver at optical wavelengths, show that good right-angle bending transmission can be achieved for wavelengths λ > 600 nm. An approximate stop-band at lower wavelengths also occurs, which can be partly understood in terms of a dispersion curve analysis. The bending efficiency is shown to correlate with a focusing effect at the inner bend corner. Finally, we show that good bending transmission can even arise out of U-turn structures.

©2005 Optical Society of America

Full Article  |  PDF Article
More Like This
Transmission of light through a periodic array of slits in a thick metallic film

Yong Xie, Armis R. Zakharian, Jerome V. Moloney, and Masud Mansuripur
Opt. Express 13(12) 4485-4491 (2005)

Off-angle illumination induced surface plasmon coupling in subwavelength metallic slits

Pei-Kuen Wei, Yu-Chieh Huang, Ching-Chang Chieng, Fan-Gang Tseng, and Wunshain Fann
Opt. Express 13(26) 10784-10794 (2005)

The electromagnetics of light transmission through subwavelength slits in metallic films

John Weiner
Opt. Express 19(17) 16139-16153 (2011)

View More...

Supplementary Material (1)

Media 1: AVI (1584 KB)     

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (7)
Fig. 1.
Fig. 1. Schematic diagrams of the systems studied: straight, right-angle bend, and U-turn slit structures.

Download Full Size | PDF

Fig. 2.
Fig. 2. (a) The Ag dielectric constant, with the solid curves being our Drude-Lorentz model and the symbols being empirical data [19]. (b) Bending transmittance, Tb , for a PEC right-angle bend with two different slit widths, d. (c) The same as (b) except now with the Drude-Lorentz Ag model.

Download Full Size | PDF

Fig. 3.
Fig. 3. Transmittance results for a rounded outer bend wall (red solid curve) are compared with the corresponding transmittance through a straight slit (blue long-dashed curve) and rectangle outer wall (green short-dashed curve.

Download Full Size | PDF

Fig. 4.
Fig. 4. (a) Dispersion relation of the lowest, even mode for a d = 100 nm straight slit in silver, with being the real part of the propagation constant. (b) The extinctions coefficient of as a function of wavelength, the imaginary part of propagation constant.

Download Full Size | PDF

Fig. 5.
Fig. 5. The square of the magnitude of the (real) electric field for times (a) t, (b) t + 0.4 × 10-15 s, and (c) t + 0.8 × 10-15 s, where t is a time such that the steady state limit has been achieved (see text).

Download Full Size | PDF

Fig. 6.
Fig. 6. Transmittance results for U-turn. The outer wall is rounded as in the right-side figure of Fig. 1.

Download Full Size | PDF

Fig. 7.
Fig. 7. (1.5MB, video for wave propagation) The square of the magnitude of the (real) electric field propagating in a U-turn waveguide.

Download Full Size | PDF

Equations (2)

Equations on this page are rendered with MathJax. Learn more.

ε M ( ω ) = ε ∞ − ω D 2 ω 2 + i γ D ω − ∑ m = 1 2 g L m ω L m 2 Δ ε ω 2 − ω L m 2 + i 2 γ L m ω .
E ( t ) = D ( t ) − P D ( t ) − ∑ m = 1 2 P L m ( t ) ε 0 ε ∞
Select as filters
Select Topics Cancel
Top
       
© Copyright 2024 | Optica Publishing Group. All rights reserved, including rights for text and data mining and training of artificial technologies or similar technologies.
Privacy | Terms of Use