Share Email Print
cover

Proceedings Paper

Beaming light from a subwavelength slit surrounded by an array of grooves with different depth
Author(s): Xiangang Luo; Changtao Wang; Chunlei Du; Haofei Shi; Hongtao Gao; Junxian Ma; Yongqi Fu; Haiying Li
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

In this paper, we discussed the beam focusing of light emerged from a subwavlength metallic slit surrounded by a set of grooves with constant space and width but variant depth at the exit side surface. Based on the numerical model presented by L. Martin-Moreno, F. J. Garcia-Vidal etc. (published in PRL 167401), we attempted to optimize grooves depth to obtain general beam manipulation, such as beam focusing. This attempt did not prove successful for many cases with variant focal length in our optimization practice, although some specific results display agreeable beam focusing with elongated focal depth. Further numerical computation shows that the excited electromagnetic field intensity around groove openings has a strong dependence on the groove depth, but the phase only vary with a maximum change value of π by tuning the groove depth. This property restricts greatly the modulation of electromagnetic field by just changing each groove depth. More geometrical parameters, including groove space and width, are recommended for optimization in the design of nano metallic groove and slit structures for specific beam manipulation.

Paper Details

Date Published: 18 August 2005
PDF: 8 pages
Proc. SPIE 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III, 59270X (18 August 2005); doi: 10.1117/12.616306
Show Author Affiliations
Xiangang Luo, Institute of Optics and Electronics, CAS (China)
Changtao Wang, Institute of Optics and Electronics, CAS (China)
Chunlei Du, Institute of Optics and Electronics, CAS (China)
Haofei Shi, Institute of Optics and Electronics, CAS (China)
Hongtao Gao, Institute of Optics and Electronics, CAS (China)
Junxian Ma, Institute of Optics and Electronics, CAS (China)
Yongqi Fu, Institute of Optics and Electronics, CAS (China)
Haiying Li, Institute of Optics and Electronics, CAS (China)


Published in SPIE Proceedings Vol. 5927:
Plasmonics: Metallic Nanostructures and Their Optical Properties III
Mark I. Stockman, Editor(s)

© SPIE. Terms of Use
Back to Top