Investigation of tunable terahertz metamaterial perfect absorber with anisotropic dielectric liquid crystal
In this letter, we report the unique design, simulation and experimental verification of an electrically tunable THz metamaterial perfect absorber consisting of complementary split ring resonator (CSRR) arrays integrated with liquid crystal as the subwavelength spacer in between. We observe a shift...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2017-01-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.4973638 |
| _version_ | 1819274767089270784 |
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| author | Mohammad P. Hokmabadi Abubaker Tareki Elmer Rivera Patrick Kung Robert G. Lindquist Seongsin M. Kim |
| author_facet | Mohammad P. Hokmabadi Abubaker Tareki Elmer Rivera Patrick Kung Robert G. Lindquist Seongsin M. Kim |
| author_sort | Mohammad P. Hokmabadi |
| collection | DOAJ |
| description | In this letter, we report the unique design, simulation and experimental verification of an electrically tunable THz metamaterial perfect absorber consisting of complementary split ring resonator (CSRR) arrays integrated with liquid crystal as the subwavelength spacer in between. We observe a shift in resonance frequency of about 5.0 GHz at 0.567 THz with a 5 V bias voltage at 1KHz between the CSRR and the metal backplane, while the absorbance and full width at half maximum bandwidth are maintained at 90% and 0.025 THz, respectively. Simulated absorption spectrum by using a uniaxial model of LC matches perfectly the experiment data and demonstrates that the effective refractive index of LC changes between 1.5 and 1.7 by sweeping a 1 kHz bias voltage from 0 V to 5 V. By matching simulation and experiment for different bias voltages, we also estimate the angle of LC molecules versus the bias voltage. Additionally, we study the created THz fields inside the spacer to gain a better insight of the characteristics of tunable response of this device. This structure and associated study can support the design of liquid crystal based tunable terahertz detectors and sensors for various applications. |
| first_indexed | 2024-12-23T23:13:39Z |
| format | Article |
| id | doaj.art-a74e58c3a69d4faba001fc81ce06b67a |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-23T23:13:39Z |
| publishDate | 2017-01-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-a74e58c3a69d4faba001fc81ce06b67a2022-12-21T17:26:36ZengAIP Publishing LLCAIP Advances2158-32262017-01-0171015102015102-810.1063/1.4973638076612ADVInvestigation of tunable terahertz metamaterial perfect absorber with anisotropic dielectric liquid crystalMohammad P. Hokmabadi0Abubaker Tareki1Elmer Rivera2Patrick Kung3Robert G. Lindquist4Seongsin M. Kim5Electrical and Computer Engineering Department, University of Alabama, Tuscaloosa, Alabama 35487, USAElectrical and Computer Engineering Department, University of Alabama in Huntsville, Huntsville, Alabama 35816, USAElectrical and Computer Engineering Department, University of Alabama, Tuscaloosa, Alabama 35487, USAElectrical and Computer Engineering Department, University of Alabama, Tuscaloosa, Alabama 35487, USAElectrical and Computer Engineering Department, University of Alabama in Huntsville, Huntsville, Alabama 35816, USAElectrical and Computer Engineering Department, University of Alabama, Tuscaloosa, Alabama 35487, USAIn this letter, we report the unique design, simulation and experimental verification of an electrically tunable THz metamaterial perfect absorber consisting of complementary split ring resonator (CSRR) arrays integrated with liquid crystal as the subwavelength spacer in between. We observe a shift in resonance frequency of about 5.0 GHz at 0.567 THz with a 5 V bias voltage at 1KHz between the CSRR and the metal backplane, while the absorbance and full width at half maximum bandwidth are maintained at 90% and 0.025 THz, respectively. Simulated absorption spectrum by using a uniaxial model of LC matches perfectly the experiment data and demonstrates that the effective refractive index of LC changes between 1.5 and 1.7 by sweeping a 1 kHz bias voltage from 0 V to 5 V. By matching simulation and experiment for different bias voltages, we also estimate the angle of LC molecules versus the bias voltage. Additionally, we study the created THz fields inside the spacer to gain a better insight of the characteristics of tunable response of this device. This structure and associated study can support the design of liquid crystal based tunable terahertz detectors and sensors for various applications.http://dx.doi.org/10.1063/1.4973638 |
| spellingShingle | Mohammad P. Hokmabadi Abubaker Tareki Elmer Rivera Patrick Kung Robert G. Lindquist Seongsin M. Kim Investigation of tunable terahertz metamaterial perfect absorber with anisotropic dielectric liquid crystal AIP Advances |
| title | Investigation of tunable terahertz metamaterial perfect absorber with anisotropic dielectric liquid crystal |
| title_full | Investigation of tunable terahertz metamaterial perfect absorber with anisotropic dielectric liquid crystal |
| title_fullStr | Investigation of tunable terahertz metamaterial perfect absorber with anisotropic dielectric liquid crystal |
| title_full_unstemmed | Investigation of tunable terahertz metamaterial perfect absorber with anisotropic dielectric liquid crystal |
| title_short | Investigation of tunable terahertz metamaterial perfect absorber with anisotropic dielectric liquid crystal |
| title_sort | investigation of tunable terahertz metamaterial perfect absorber with anisotropic dielectric liquid crystal |
| url | http://dx.doi.org/10.1063/1.4973638 |
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