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Title: Voltage-tunable dual-layer terahertz metamaterials

Journal Article · · Microsystems & Nanoengineering (Online)
 [1];  [1];  [2];  [1];  [1];  [2];  [1]
  1. Boston Univ., MA (United States)
  2. Boston Univ., MA (United States); Univ. of California, San Diego, CA (United States)

This paper presents the design, fabrication, and characterization of a real-time voltage-tunable terahertz metamaterial based on microelectromechanical systems and broadside-coupled split-ring resonators. In our metamaterial, the magnetic and electric interactions between the coupled resonators are modulated by a comb-drive actuator, which provides continuous lateral shifting between the coupled resonators by up to 20 μm. For these strongly coupled split-ring resonators, both a symmetric mode and an anti-symmetric mode are observed. With increasing lateral shift, the electromagnetic interactions between the split-ring resonators weaken, resulting in frequency shifting of the resonant modes. Over the entire lateral shift range, the symmetric mode blueshifts by ~60 GHz, and the anti-symmetric mode redshifts by ~50 GHz. The amplitude of the transmission at 1.03 THz is modulated by 74%; moreover, a 180° phase shift is achieved at 1.08 THz. Our tunable metamaterial device has myriad potential applications, including terahertz spatial light modulation, phase modulation, and chemical sensing. Furthermore, the scheme that we have implemented can be scaled to operate at other frequencies, thereby enabling a wide range of distinct applications.

Research Organization:
Boston Univ., MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0002384; ECCS-1309835; FG02-09ER46643
OSTI ID:
1623784
Journal Information:
Microsystems & Nanoengineering (Online), Vol. 2, Issue 1; ISSN 2055-7434
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 72 works
Citation information provided by
Web of Science

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Integrating microsystems with metamaterials towards metadevices journal January 2019
Terahertz Field Confinement in Nonlinear Metamaterials and Near-Field Imaging journal February 2019
Electrically Controllable Molecularization of Terahertz Meta-Atoms journal June 2018
Design, Fabrication, and Modulation of THz Bandpass Metamaterials journal October 2019
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Intensity Switchable and Wide-Angle Mid-Infrared Perfect Absorber with Lithography-Free Phase-Change Film of Ge2Sb2Te5 journal June 2019
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Ultrafast Terahertz Frequency and Phase Tuning by All‐Optical Molecularization of Metasurfaces journal August 2019
Ultrafast Frequency Shift of Electromagnetically Induced Transparency in Terahertz Metaphotonic Devices journal February 2020
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Bidirectional reconfiguration and thermal tuning of microcantilever metamaterial device operating from 77 K to 400 K journal December 2017
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