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Multiple coupling of surface plasmons in quasiperiodic gratings
 

Summary: Multiple coupling of surface plasmons in
quasiperiodic gratings
Ido Dolev,* Michael Volodarsky, Gil Porat, and Ady Arie
Department of Physical Electronics, Fleischman Faculty of Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel
*Corresponding author: idodolev@tau.ac.il
Received February 15, 2011; revised March 21, 2011; accepted March 29, 2011;
posted March 30, 2011 (Doc. ID 142733); published April 22, 2011
Whereas periodic gratings enable us to couple light into a surface plasmon polariton only at a specific angle and
wavelength, we show here that quasiperiodic gratings enable the coupling of light at multiple wavelengths and
angles. The quasiperiodic grating can be designed in a systematic manner using the dual-grid method, thereby
enabling us to control the coupling strength and grating dimensions. We verified the method experimentally by
efficiently coupling light into a surface plasmon from several different illumination angles using a single quasi-
periodic grating. 2011 Optical Society of America
OCIS codes: 050.2770, 240.6680, 240.5420.
Surface plasmon polaritons (SPPs) are surface electro-
magnetic waves propagating along the interface of a metal
with a negative dielectric constant and a dielectric
material with a positive dielectric constant. The SPP plays
a key role in many research applications and devices [1],
including chemical and biochemical sensors based on en-

  

Source: Arie, Ady - Department of Electrical Engineering-Physical Electronics, Tel Aviv University

 

Collections: Engineering