Circular Dichroism in the Second Harmonic Field Evidenced by Asymmetric Au Coated GaAs Nanowires
Optical circular dichroism (CD) is an important phenomenon in nanophotonics, that addresses top level applications such as circular polarized photon generation in optics, enantiomeric recognition in biophotonics and so on. Chiral nanostructures can lead to high CD, but the fabrication process usuall...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-02-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/11/2/225 |
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| author | Alessandro Belardini Grigore Leahu Emilija Petronijevic Teemu Hakkarainen Eero Koivusalo Marcelo Rizzo Piton Soile Talmila Mircea Guina Concita Sibilia |
| author_facet | Alessandro Belardini Grigore Leahu Emilija Petronijevic Teemu Hakkarainen Eero Koivusalo Marcelo Rizzo Piton Soile Talmila Mircea Guina Concita Sibilia |
| author_sort | Alessandro Belardini |
| collection | DOAJ |
| description | Optical circular dichroism (CD) is an important phenomenon in nanophotonics, that addresses top level applications such as circular polarized photon generation in optics, enantiomeric recognition in biophotonics and so on. Chiral nanostructures can lead to high CD, but the fabrication process usually requires a large effort, and extrinsic chiral samples can be produced by simpler techniques. Glancing angle deposition of gold on GaAs nanowires can (NWs) induces a symmetry breaking that leads to an optical CD response that mimics chiral behavior. The GaAs NWs have been fabricated by a self-catalyzed, bottom-up approach, leading to large surfaces and high-quality samples at a relatively low cost. Here, we investigate the second harmonic generation circular dichroism (SHG-CD) signal on GaAs nanowires partially covered with Au. SHG is a nonlinear process of even order, and thus extremely sensitive to symmetry breaking. Therefore, the visibility of the signal is very high when the fabricated samples present resonances at first and second harmonic frequencies (i.e., 800 and 400 nm, in our case). |
| first_indexed | 2024-12-18T06:48:54Z |
| format | Article |
| id | doaj.art-d2ee7b84975c495b87ceea0a2303b7c6 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-12-18T06:48:54Z |
| publishDate | 2020-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-d2ee7b84975c495b87ceea0a2303b7c62022-12-21T21:17:25ZengMDPI AGMicromachines2072-666X2020-02-0111222510.3390/mi11020225mi11020225Circular Dichroism in the Second Harmonic Field Evidenced by Asymmetric Au Coated GaAs NanowiresAlessandro Belardini0Grigore Leahu1Emilija Petronijevic2Teemu Hakkarainen3Eero Koivusalo4Marcelo Rizzo Piton5Soile Talmila6Mircea Guina7Concita Sibilia8SBAI Department, Sapienza University of Rome, 00161 Rome, ItalySBAI Department, Sapienza University of Rome, 00161 Rome, ItalySBAI Department, Sapienza University of Rome, 00161 Rome, ItalyOptoelectronics Research Centre, Tampere University, 33720 Tampere, FinlandOptoelectronics Research Centre, Tampere University, 33720 Tampere, FinlandOptoelectronics Research Centre, Tampere University, 33720 Tampere, FinlandOptoelectronics Research Centre, Tampere University, 33720 Tampere, FinlandOptoelectronics Research Centre, Tampere University, 33720 Tampere, FinlandSBAI Department, Sapienza University of Rome, 00161 Rome, ItalyOptical circular dichroism (CD) is an important phenomenon in nanophotonics, that addresses top level applications such as circular polarized photon generation in optics, enantiomeric recognition in biophotonics and so on. Chiral nanostructures can lead to high CD, but the fabrication process usually requires a large effort, and extrinsic chiral samples can be produced by simpler techniques. Glancing angle deposition of gold on GaAs nanowires can (NWs) induces a symmetry breaking that leads to an optical CD response that mimics chiral behavior. The GaAs NWs have been fabricated by a self-catalyzed, bottom-up approach, leading to large surfaces and high-quality samples at a relatively low cost. Here, we investigate the second harmonic generation circular dichroism (SHG-CD) signal on GaAs nanowires partially covered with Au. SHG is a nonlinear process of even order, and thus extremely sensitive to symmetry breaking. Therefore, the visibility of the signal is very high when the fabricated samples present resonances at first and second harmonic frequencies (i.e., 800 and 400 nm, in our case).https://www.mdpi.com/2072-666X/11/2/225extrinsic chiralitysecond harmonic generationgaas nanowiresplasmonic coating |
| spellingShingle | Alessandro Belardini Grigore Leahu Emilija Petronijevic Teemu Hakkarainen Eero Koivusalo Marcelo Rizzo Piton Soile Talmila Mircea Guina Concita Sibilia Circular Dichroism in the Second Harmonic Field Evidenced by Asymmetric Au Coated GaAs Nanowires Micromachines extrinsic chirality second harmonic generation gaas nanowires plasmonic coating |
| title | Circular Dichroism in the Second Harmonic Field Evidenced by Asymmetric Au Coated GaAs Nanowires |
| title_full | Circular Dichroism in the Second Harmonic Field Evidenced by Asymmetric Au Coated GaAs Nanowires |
| title_fullStr | Circular Dichroism in the Second Harmonic Field Evidenced by Asymmetric Au Coated GaAs Nanowires |
| title_full_unstemmed | Circular Dichroism in the Second Harmonic Field Evidenced by Asymmetric Au Coated GaAs Nanowires |
| title_short | Circular Dichroism in the Second Harmonic Field Evidenced by Asymmetric Au Coated GaAs Nanowires |
| title_sort | circular dichroism in the second harmonic field evidenced by asymmetric au coated gaas nanowires |
| topic | extrinsic chirality second harmonic generation gaas nanowires plasmonic coating |
| url | https://www.mdpi.com/2072-666X/11/2/225 |
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