Journal
OPTICS EXPRESS
Volume 21, Issue 5, Pages 5949-5956Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.005949
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Funding
- National Research Foundation [NRF-G-CRP 2007-01]
- A*Star, Singapore [092154009]
- AOARD
- State Key Program for Basic Research of China [2012CB921501]
- National Natural Science Foundation of China [11174136]
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We propose a new scheme on unidirectional surface plasmon-polariton (SPP) excitation with the following advantages: ultracompact size, working at arbitrary incidence angle and over a wide spectrum. The proposed structure utilizes a partially filled metallic slot with dielectric to realize unidirectional SPP excitation via direct field manipulation. We theoretically and numerically show that unidirectional SPP excitation with a ratio of 93% can be achieved by a structure with a 50 nm slot. The proposed structure keeps its functional capability over incident angles from -80 degrees to 80 degrees, and has a broadband working spectrum of more than 70 nm. (c) 2013 Optical Society of America
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