Analysis of Acoustic Surface Wave Focused Unidirectional Interdigital Transducers Using Coupling-of-Mode Theory
In cell or droplet separation, high acoustic wave energy of a surface acoustic wave (SAW) device is required to generate sufficient acoustic radiation force. In this paper, the electrode width-control floating electrode focused unidirectional interdigital transducer (EWC-FEFUDT) is proposed due to i...
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2024-12-01
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| author | Guopeng Hui Tinglun Ao Haotian Liu Minglei Li Chen Chen |
| author_facet | Guopeng Hui Tinglun Ao Haotian Liu Minglei Li Chen Chen |
| author_sort | Guopeng Hui |
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| description | In cell or droplet separation, high acoustic wave energy of a surface acoustic wave (SAW) device is required to generate sufficient acoustic radiation force. In this paper, the electrode width-control floating electrode focused unidirectional interdigital transducer (EWC-FEFUDT) is proposed due to its enhanced focusing properties. The performance of the EWC-FEFUDT is investigated using the Coupling-of-Mode (COM) theory, and the COM parameter is extracted using the Finite Element Method (FEM). The four different forbidden band edge frequencies account for the unidirectionality of the proposed EWC-FEFUDT. A direction angle of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>ϕ</mi></mrow><mrow><mi>κ</mi></mrow></msub><mo>−</mo><msub><mrow><mi>ϕ</mi></mrow><mrow><mi>ζ</mi></mrow></msub><mo>=</mo><mn>44.5</mn><mo>°</mo></mrow></semantics></math></inline-formula> of the EWC-FEFUDT (Design 3) is obtained, being fairly close to the optimum value of 45°. The EWC-FEFUDT (Design 3) has a lower insertion loss (IL) of −5.1 dB and greater unidirectionality (20 × log<sub>10</sub>(<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>D</mi></mrow></semantics></math></inline-formula>) = 13.8 dB). The SAW maximum amplitude of the EWC-FEFUDT (Design 3) is increased by about <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>1.5</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup><mo> </mo><mi>µ</mi><mi mathvariant="normal">m</mi></mrow></semantics></math></inline-formula> compared to that of the focused interdigital transducers (FIDTs). The maximum acoustic pressure of the EWC-FEFUDT is an order of magnitude higher than that of FIDTs. The EWC-FEFUDT exhibits enhanced focusing properties. The proposed EWC-FEFUDT may provide an alternative method for cell or droplet separation in an efficient manner. |
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| institution | Kabale University |
| issn | 2072-666X |
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| spelling | doaj-art-e9bc463697554697a4d1d45b446c87282025-01-24T13:41:48ZengMDPI AGMicromachines2072-666X2024-12-01161310.3390/mi16010003Analysis of Acoustic Surface Wave Focused Unidirectional Interdigital Transducers Using Coupling-of-Mode TheoryGuopeng Hui0Tinglun Ao1Haotian Liu2Minglei Li3Chen Chen4School of Physics and Electronic Information, Yunnan Normal University, No. 1 Yuhua Area, Chenggong District, Kunming 650500, ChinaSchool of Physics and Electronic Information, Yunnan Normal University, No. 1 Yuhua Area, Chenggong District, Kunming 650500, ChinaSchool of Physics and Electronic Information, Yunnan Normal University, No. 1 Yuhua Area, Chenggong District, Kunming 650500, ChinaSchool of Physics and Electronic Information, Yunnan Normal University, No. 1 Yuhua Area, Chenggong District, Kunming 650500, ChinaSchool of Physics and Electronic Information, Yunnan Normal University, No. 1 Yuhua Area, Chenggong District, Kunming 650500, ChinaIn cell or droplet separation, high acoustic wave energy of a surface acoustic wave (SAW) device is required to generate sufficient acoustic radiation force. In this paper, the electrode width-control floating electrode focused unidirectional interdigital transducer (EWC-FEFUDT) is proposed due to its enhanced focusing properties. The performance of the EWC-FEFUDT is investigated using the Coupling-of-Mode (COM) theory, and the COM parameter is extracted using the Finite Element Method (FEM). The four different forbidden band edge frequencies account for the unidirectionality of the proposed EWC-FEFUDT. A direction angle of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>ϕ</mi></mrow><mrow><mi>κ</mi></mrow></msub><mo>−</mo><msub><mrow><mi>ϕ</mi></mrow><mrow><mi>ζ</mi></mrow></msub><mo>=</mo><mn>44.5</mn><mo>°</mo></mrow></semantics></math></inline-formula> of the EWC-FEFUDT (Design 3) is obtained, being fairly close to the optimum value of 45°. The EWC-FEFUDT (Design 3) has a lower insertion loss (IL) of −5.1 dB and greater unidirectionality (20 × log<sub>10</sub>(<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>D</mi></mrow></semantics></math></inline-formula>) = 13.8 dB). The SAW maximum amplitude of the EWC-FEFUDT (Design 3) is increased by about <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>1.5</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mo>−</mo><mn>4</mn></mrow></msup><mo> </mo><mi>µ</mi><mi mathvariant="normal">m</mi></mrow></semantics></math></inline-formula> compared to that of the focused interdigital transducers (FIDTs). The maximum acoustic pressure of the EWC-FEFUDT is an order of magnitude higher than that of FIDTs. The EWC-FEFUDT exhibits enhanced focusing properties. The proposed EWC-FEFUDT may provide an alternative method for cell or droplet separation in an efficient manner.https://www.mdpi.com/2072-666X/16/1/3coupling-of-mode theoryelectrode width-control floating electrode unidirectional transducerfinite element methodelectric potential standing wavesurface acoustic wavetransduction center |
| spellingShingle | Guopeng Hui Tinglun Ao Haotian Liu Minglei Li Chen Chen Analysis of Acoustic Surface Wave Focused Unidirectional Interdigital Transducers Using Coupling-of-Mode Theory Micromachines coupling-of-mode theory electrode width-control floating electrode unidirectional transducer finite element method electric potential standing wave surface acoustic wave transduction center |
| title | Analysis of Acoustic Surface Wave Focused Unidirectional Interdigital Transducers Using Coupling-of-Mode Theory |
| title_full | Analysis of Acoustic Surface Wave Focused Unidirectional Interdigital Transducers Using Coupling-of-Mode Theory |
| title_fullStr | Analysis of Acoustic Surface Wave Focused Unidirectional Interdigital Transducers Using Coupling-of-Mode Theory |
| title_full_unstemmed | Analysis of Acoustic Surface Wave Focused Unidirectional Interdigital Transducers Using Coupling-of-Mode Theory |
| title_short | Analysis of Acoustic Surface Wave Focused Unidirectional Interdigital Transducers Using Coupling-of-Mode Theory |
| title_sort | analysis of acoustic surface wave focused unidirectional interdigital transducers using coupling of mode theory |
| topic | coupling-of-mode theory electrode width-control floating electrode unidirectional transducer finite element method electric potential standing wave surface acoustic wave transduction center |
| url | https://www.mdpi.com/2072-666X/16/1/3 |
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