Effects of Microstructure Variations on Macroscopic Terahertz Metafilm Properties

O'Hara, John F.; Smirnova, Evgenya; Azad, Abul K.; Chen, Hou-Tong; Taylor, Antoinette J.

doi:10.1155/2007/49691

Title: Effects of Microstructure Variations on Macroscopic Terahertz Metafilm Properties

Full Record
Other Related Research

Abstract

The properties of planar, single-layer metamaterials, or metafilms, are studied by varying the structural components of the split-ring resonators used to comprise the overall medium. Measurements and simulations reveal how minor design variations in split-ring resonator structures can result in significant changes in the macroscopic properties of the metafilm. A transmission-line/circuit model is also used to clarify some of the behavior and design limitations of the metafilms. Though our results are illustrated in the terahertz frequency range, the work has broader implications, particularly with respect to filtering, modulation, and switching devices.

Authors:: O'Hara, John F.; Smirnova, Evgenya; Azad, Abul K.; Chen, Hou-Tong; Taylor, Antoinette J.

Publication Date:: Mon Jan 01 00:00:00 EST 2007

Sponsoring Org.:: USDOE

OSTI Identifier:: 1198187

Grant/Contract Number:: AC52-06NA25396

Resource Type:: Published Article

Journal Name:: Active and Passive Electronic Components

Additional Journal Information:: Journal Name: Active and Passive Electronic Components Journal Volume: 2007; Journal ID: ISSN 0882-7516

Publisher:: Hindawi Publishing Corporation

Country of Publication:: Country unknown/Code not available

Language:: English

Citation Formats


                    O'Hara, John F., Smirnova, Evgenya, Azad, Abul K., Chen, Hou-Tong, and Taylor, Antoinette J. Effects of Microstructure Variations on Macroscopic Terahertz Metafilm Properties.  Country unknown/Code not available: N. p., 2007. 
Web.  doi:10.1155/2007/49691.

Copy to clipboard


                    O'Hara, John F., Smirnova, Evgenya, Azad, Abul K., Chen, Hou-Tong, & Taylor, Antoinette J. Effects of Microstructure Variations on Macroscopic Terahertz Metafilm Properties.  Country unknown/Code not available.  https://doi.org/10.1155/2007/49691

Copy to clipboard


                    O'Hara, John F., Smirnova, Evgenya, Azad, Abul K., Chen, Hou-Tong, and Taylor, Antoinette J. Mon .  
"Effects of Microstructure Variations on Macroscopic Terahertz Metafilm Properties".  Country unknown/Code not available.  https://doi.org/10.1155/2007/49691.

Copy to clipboard


                    
@article{osti_1198187,

  title        = {Effects of Microstructure Variations on Macroscopic Terahertz Metafilm Properties},

  author       = {O'Hara, John F. and Smirnova, Evgenya and Azad, Abul K. and Chen, Hou-Tong and Taylor, Antoinette J.},

  abstractNote = {The properties of planar, single-layer metamaterials, or metafilms, are studied by varying the structural components of the split-ring resonators used to comprise the overall medium. Measurements and simulations reveal how minor design variations in split-ring resonator structures can result in significant changes in the macroscopic properties of the metafilm. A transmission-line/circuit model is also used to clarify some of the behavior and design limitations of the metafilms. Though our results are illustrated in the terahertz frequency range, the work has broader implications, particularly with respect to filtering, modulation, and switching devices.},

  doi          = {10.1155/2007/49691},

  journal      = {Active and Passive Electronic Components},

  number       = ,

  volume       = 2007,

  place        = {Country unknown/Code not available},

  year         = {Mon Jan 01 00:00:00 EST 2007},

  month        = {Mon Jan 01 00:00:00 EST 2007}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Publisher's Version of Record
https://doi.org/10.1155/2007/49691

Other availability

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE PAGES and OSTI.GOV collections:

Perfect terahertz absorber using fishnet based metafilm

Conference Azad, Abul Kalam ; Shchegolkov, Dmitry Yu ; Chen, Houtong ; ...

We present a perfect terahertz (THz) absorber working for a broad-angle of incidence. The two fold symmetry of rectangular fishnet structure allows either complete absorption or mirror like reflection depending on the polarization of incident the THz beam. Metamaterials enable the ability to control the electromagnetic wave in a unique fashion by designing the permittivity or permeability of composite materials with desired values. Although the initial idea of metamaterials was to obtain a negative index medium, however, the evolution of metamaterials (MMs) offers a variety of practically applicable devices for controlling electromagnetic wave such as tunable filters, modulators, phase shifters,more »« less
https://doi.org/10.1364/CLEO.2010.CTuBB4

Full Text Available
Coupling Schemes in Terahertz Planar Metamaterials

Journal Article Roy Chowdhury, Dibakar ; Singh, Ranjan ; Taylor, Antoinette J. ; ... - International Journal of Optics

We present a review of the different coupling schemes in a planar array of terahertz metamaterials. The gap-to-gap near-field capacitive coupling between split-ring resonators in a unit cell leads to either blue shift or red shift of the fundamental inductive-capacitive ( LC ) resonance, depending on the position of the split gap. The inductive coupling is enhanced by decreasing the inter resonator distance resulting in strong blue shifts of the LC resonance. We observe the LC resonance tuning only when the split-ring resonators are in close proximity of each other; otherwise, they appear to be uncoupled. Conversely, the higher-order resonancesmore »« less
https://doi.org/10.1155/2012/148985
Tuning the response of terahertz metamaterial at low temperatures

Conference Singh, Ranjan ; O' Hara, John F ; Taylor, Antoinette ; ...

The transmission response of planar thin film metamateriaJs were measured at room and liquid nitrogen temperatures using terahertz time-domain spectroscopy. The behaviour of metamaterials at low temperatures is shown to have low-loss since the nonradiative losses are strongly suppressed due to higher metal film conductivity. We observe a temperature tunable effect and a gradual increase of 40% in the quality factor of the metamaterial. The emerging field of metamaterial (MM) has opened a gateway to unprecedented electromagnetic properties and functionality unattainable from naturally occurring materials. Planar metamaterials are made of thin metal films with a thickness comparable to the skinmore »« less
Full Text Available
Three dimensional metafilms with dual channel unit cells

Journal Article Burckel, D. Bruce ; Campione, Salvatore ; Davids, Paul S. ; ... - Applied Physics Letters

Three-dimensional (3D) metafilms composed of periodic arrays of silicon unit cells containing single and multiple micrometer-scale vertical split ring resonators (SRRs) per unit cell were fabricated. In contrast to planar and stacked planar structures, these 3D metafilms have a thickness t ~λ_d/4, allowing for classical thin film effects in the long wavelength limit. The infrared specular far-field scattering response was measured for metafilms containing one and two resonators per unit cell and compared to numerical simulations. Excellent agreement in the frequency region below the onset of diffractive scattering was obtained. For dense arrays of unit cells containing single SRRs, normallymore »« less
Cited by 16
https://doi.org/10.1063/1.4979698

Full Text Available
Micro-electro-mechanically tunable metamaterial with enhanced electro-optic performance

Journal Article Pitchappa, Prakash ; Pei Ho, Chong ; Institute of Microelectronics ; ... - Applied Physics Letters

We experimentally demonstrate a micro-electro-mechanically tunable metamaterial with enhanced electro-optical performance by increasing the number of movable cantilevers in the symmetrical split ring resonator metamaterial unit cell. Simulations were carried out to understand the interaction of the incident terahertz radiation with out-of-plane deforming metamaterial resonator. In order to improve the overall device performance, the number of released cantilever in a unit cell was increased from one to two, and it was seen that the tunable range was doubled and the switching contrast improved by a factor of around five at 0.7 THz. This simple design approach can be adopted formore »« less
https://doi.org/10.1063/1.4871517

Similar Records