Single/Dual/Triple Broadband Metasurface Based Polarisation Converter with High Angular Stability for Terahertz Applications
This paper presents design and characterisation of a new compact metasurface based linear polarisation converter for terahertz applications. The metasurface unit cell with periodicity of 0.292<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline&quo...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/13/9/1547 |
| _version_ | 1797484621529612288 |
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| author | Shyam Sundar Pati Swaroop Sahoo |
| author_facet | Shyam Sundar Pati Swaroop Sahoo |
| author_sort | Shyam Sundar Pati |
| collection | DOAJ |
| description | This paper presents design and characterisation of a new compact metasurface based linear polarisation converter for terahertz applications. The metasurface unit cell with periodicity of 0.292<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>λ</mi><mn>0</mn></msub></semantics></math></inline-formula> consists of an asymmetrically oriented planar double semicircular goblet-shaped resonators. It is printed on a polydimethylsiloxane (PDMS) dielectric substrate backed by a gold layer that acts as a ground plane. This metasurface structure exhibits a broadband cross-polarisation conversion in the frequency range of 0.72–0.99 THz with a polarisation conversion ratio (PCR) > 95% and angular stability > <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>40</mi><mo>∘</mo></msup></semantics></math></inline-formula> for both TE and TM modes. However, the PCR for the single band is >99% at resonant frequencies of 0.755 and 0.94 THz, while the optimised design shows 100% PCR over a BW of 95 GHz. Furthermore, slight modification and optimisation of the broadband design results in quad-ring and slotted DSGRs that produce dual and triple broadband polarisation conversion, respectively. The quad-ring DSGR performs polarisation conversion for frequency range of 0.70–1.08 and 1.61–1.76 THz while the slotted DSGR shows the triple broadband cross-conversion for frequency range of 0.67–0.85, 1.04–1.11, and 1.62–1.76 THz with PCR > 95%. This design is simple, easy to modify to implement single and multi broadband polarisation conversion with high PCR at terahertz regime. In addition to that, it is easy to fabricate and integrate with other components like multiple-input multiple-output terahertz antennas for mutual coupling reduction. |
| first_indexed | 2024-03-09T23:07:04Z |
| format | Article |
| id | doaj.art-9e9e0e6c1a1245aba9bf4c7368a1e968 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-09T23:07:04Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-9e9e0e6c1a1245aba9bf4c7368a1e9682023-11-23T17:51:22ZengMDPI AGMicromachines2072-666X2022-09-01139154710.3390/mi13091547Single/Dual/Triple Broadband Metasurface Based Polarisation Converter with High Angular Stability for Terahertz ApplicationsShyam Sundar Pati0Swaroop Sahoo1Indian Institute of Technology Palakkad, Palakkad 678623, IndiaIndian Institute of Technology Palakkad, Palakkad 678623, IndiaThis paper presents design and characterisation of a new compact metasurface based linear polarisation converter for terahertz applications. The metasurface unit cell with periodicity of 0.292<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>λ</mi><mn>0</mn></msub></semantics></math></inline-formula> consists of an asymmetrically oriented planar double semicircular goblet-shaped resonators. It is printed on a polydimethylsiloxane (PDMS) dielectric substrate backed by a gold layer that acts as a ground plane. This metasurface structure exhibits a broadband cross-polarisation conversion in the frequency range of 0.72–0.99 THz with a polarisation conversion ratio (PCR) > 95% and angular stability > <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>40</mi><mo>∘</mo></msup></semantics></math></inline-formula> for both TE and TM modes. However, the PCR for the single band is >99% at resonant frequencies of 0.755 and 0.94 THz, while the optimised design shows 100% PCR over a BW of 95 GHz. Furthermore, slight modification and optimisation of the broadband design results in quad-ring and slotted DSGRs that produce dual and triple broadband polarisation conversion, respectively. The quad-ring DSGR performs polarisation conversion for frequency range of 0.70–1.08 and 1.61–1.76 THz while the slotted DSGR shows the triple broadband cross-conversion for frequency range of 0.67–0.85, 1.04–1.11, and 1.62–1.76 THz with PCR > 95%. This design is simple, easy to modify to implement single and multi broadband polarisation conversion with high PCR at terahertz regime. In addition to that, it is easy to fabricate and integrate with other components like multiple-input multiple-output terahertz antennas for mutual coupling reduction.https://www.mdpi.com/2072-666X/13/9/1547metamaterialterahertzpolarisation converterbandwidthhigh impedance surfaceangular stability |
| spellingShingle | Shyam Sundar Pati Swaroop Sahoo Single/Dual/Triple Broadband Metasurface Based Polarisation Converter with High Angular Stability for Terahertz Applications Micromachines metamaterial terahertz polarisation converter bandwidth high impedance surface angular stability |
| title | Single/Dual/Triple Broadband Metasurface Based Polarisation Converter with High Angular Stability for Terahertz Applications |
| title_full | Single/Dual/Triple Broadband Metasurface Based Polarisation Converter with High Angular Stability for Terahertz Applications |
| title_fullStr | Single/Dual/Triple Broadband Metasurface Based Polarisation Converter with High Angular Stability for Terahertz Applications |
| title_full_unstemmed | Single/Dual/Triple Broadband Metasurface Based Polarisation Converter with High Angular Stability for Terahertz Applications |
| title_short | Single/Dual/Triple Broadband Metasurface Based Polarisation Converter with High Angular Stability for Terahertz Applications |
| title_sort | single dual triple broadband metasurface based polarisation converter with high angular stability for terahertz applications |
| topic | metamaterial terahertz polarisation converter bandwidth high impedance surface angular stability |
| url | https://www.mdpi.com/2072-666X/13/9/1547 |
| work_keys_str_mv | AT shyamsundarpati singledualtriplebroadbandmetasurfacebasedpolarisationconverterwithhighangularstabilityforterahertzapplications AT swaroopsahoo singledualtriplebroadbandmetasurfacebasedpolarisationconverterwithhighangularstabilityforterahertzapplications |