Performance improvement of long-range surface plasmon structure for use in an all-optical switch

Ali Jandaghian; Ali Lotfalian; Mohsen Kouhkan; Ezeddin Mohajerani

doi:10.1117/1.OE.56.12.121901

7 December 2016 Performance improvement of long-range surface plasmon structure for use in an all-optical switch

Ali Jandaghian, Ali Lotfalian, Mohsen Kouhkan, Ezeddin Mohajerani

Author Affiliations +

Optical Engineering, Vol. 56, Issue 12, 121901 (December 2016). https://doi.org/10.1117/1.OE.56.12.121901

Abstract

This paper presents important parameters in performance of long-range surface plasmon (LRSP) structure (SF4/PVA/silver/PMMA-DR1) that are improved. We select poly(vinyl alcohol) (PVA) as the first dielectric layer due to its water solubility and good optical properties. The thickness of PVA and silver layers is optimized by transfer matrix method based on Fresnel equations. Surface morphologies of PVA and silver surfaces are analyzed by AFM imaging due to their important role in the performance of an LRSP structure. Furthermore, the sensitivity of an all-optical switch based on plasmon is investigated. In order to compare the sensitivity of LRSP and conventional surface plasmon (SP) structures in switching mode, full wide of half maximum, resonance angles, and pump powers of both structures are measured by a custom-made optical setup based on angular interrogation with a precision of 0.01 deg. Finally, we conclude that for creating equal signal levels in both samples, the required pump power for LRSP structure was about three times less than that for conventional SP; thus, these results led to power savings in optical switches.

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Ali Jandaghian, Ali Lotfalian, Mohsen Kouhkan, and Ezeddin Mohajerani "Performance improvement of long-range surface plasmon structure for use in an all-optical switch," Optical Engineering 56(12), 121901 (7 December 2016). https://doi.org/10.1117/1.OE.56.12.121901

Published: 7 December 2016

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