
Proceedings Paper
Photomodulation of metamaterial: an integrated approachFormat | Member Price | Non-Member Price |
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Paper Abstract
In this paper, we present an integrated fabrication process for realizing a switching/modulation mechanism for negative
index materials (NIMs) based on photoconductive coupling. The metamaterial element chosen is an array of regular
copper split-ring resonator (SRR) that was fabricated on two different substrates: high-resistivity silicon (HRS) and
fused silica glass. The switching mechanism proposed can be achieved through tuning the SRR gap and/or substrate
conductivity. The photosensitive material of the SRR structure (amorphous silicon for the glass substrate samples and
intrinsic silicon for the HRS substrate samples) upon illumination generates excess carriers that essentially shunt the gap
capacitance thus diminishing the resonance response significantly. The response in terms of S-parameters is simulated
using HFSS under varying magnitude of optical illumination. Our simulation with a single SRR to demonstrate total
suppression of resonance amplitude with a high extinction ratio is applicable to NIMs comprising of both negative
permeability and negative permittivity without any loss of generality. This method may provide a basis for long-sought
practical applications and devices based on NIM in the fields of ultra-fast communications at RF and optical
frequencies, sensing and imaging promising a potential of dramatically improving the performance of existing phased
array antennas, optical beam-forming networks, antenna remoting and transportation of RF power through fiber-radio.
Paper Details
Date Published: 12 October 2007
PDF: 9 pages
Proc. SPIE 6772, Terahertz Physics, Devices, and Systems II, 677208 (12 October 2007); doi: 10.1117/12.738270
Published in SPIE Proceedings Vol. 6772:
Terahertz Physics, Devices, and Systems II
Mehdi Anwar; Anthony J. DeMaria; Michael S. Shur, Editor(s)
PDF: 9 pages
Proc. SPIE 6772, Terahertz Physics, Devices, and Systems II, 677208 (12 October 2007); doi: 10.1117/12.738270
Show Author Affiliations
Logeeswaran Veerayah Jayaraman, Univ. of California, Davis (United States)
M. Saif Islam, Univ. of California, Davis (United States)
Sagi Mathai, Hewlett Packard Labs. (United States)
M. Saif Islam, Univ. of California, Davis (United States)
Sagi Mathai, Hewlett Packard Labs. (United States)
Mike R. Tan, Hewlett-Packard Labs. (United States)
Shih-Yuan Wang, Hewlett-Packard Labs. (United States)
R. Stanley Williams, Hewlett-Packard Labs. (United States)
Shih-Yuan Wang, Hewlett-Packard Labs. (United States)
R. Stanley Williams, Hewlett-Packard Labs. (United States)
Published in SPIE Proceedings Vol. 6772:
Terahertz Physics, Devices, and Systems II
Mehdi Anwar; Anthony J. DeMaria; Michael S. Shur, Editor(s)
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