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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 16 — Aug. 1, 2011
  • pp: 15265–15274

High contrast modulation of plasmonic signals using nanoscale dual-frequency liquid crystals

Joseph S. T. Smalley, Yanhui Zhao, Ahmad Ahsan Nawaz, Qingzhen Hao, Yi Ma, Iam-Choon Khoo, and Tony Jun Huang  »View Author Affiliations


Optics Express, Vol. 19, Issue 16, pp. 15265-15274 (2011)
http://dx.doi.org/10.1364/OE.19.015265


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Abstract

We have designed and simulated a dual-frequency liquid crystal (DFLC) based plasmonic signal modulator capable of achieving over 15 dB modulation depth. The voltage-controlled DFLC is combined with a groove and slit configuration and its operation is discussed. Using the finite-difference time domain (FDTD) method, simulations were conducted to discover the groove-slit separation distance that enabled a practically useful modulation depth for the two states of the DFLC. Moreover, we have shown that significant improvement in modulation depth can be achieved by addition of a second groove to the design structure. Additionally, a performance analysis indicates a switching energy on the order of femtojoules and a switching speed on the order of 100 microseconds. Results of this investigation can be useful for the future design, simulation, and fabrication of DFLC-based plasmonic signal modulating devices, which have application in electro-optical and all-optical information systems.

© 2011 OSA

OCIS Codes
(230.4110) Optical devices : Modulators
(240.6680) Optics at surfaces : Surface plasmons
(250.5403) Optoelectronics : Plasmonics
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Optical Devices

History
Original Manuscript: June 23, 2011
Revised Manuscript: July 19, 2011
Manuscript Accepted: July 20, 2011
Published: July 25, 2011

Citation
Joseph S. T. Smalley, Yanhui Zhao, Ahmad Ahsan Nawaz, Qingzhen Hao, Yi Ma, Iam-Choon Khoo, and Tony Jun Huang, "High contrast modulation of plasmonic signals using nanoscale dual-frequency liquid crystals," Opt. Express 19, 15265-15274 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-16-15265


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