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Photo-Acoustic Spectroscopy Reveals Extrinsic Optical Chirality in GaAs-Based Nanowires Partially Covered with Gold

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Abstract

We report on the extrinsic chirality behavior of GaAs-based NWs asymmetrically hybridized with Au. The samples are fabricated by a recently developed, lithography-free self-organized GaAs growth, with the addition of AlGaAs shell and GaAs supershell. The angled Au flux is then used to cover three-out-of-six sidewalls with a thin layer of Au. Oblique incidence and proper sample orientation can lead to circular dichroism. We characterize this chiral behavior at \( 532\,{\text{nm}} \) and \( 980\,{\text{nm}} \) by means of photo-acoustic spectroscopy, which directly measures the difference in absorption for the circularly polarized light of the opposite headedness. For the first time to our knowledge, circular dichroism is observed in both the amplitude and the phase of the photo-acoustic signal. We strongly believe that such samples can be used for chiral applications, spanning from circularly polarized light emission, to the enantioselectivity applications.

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Funding

This work is funded by Academy of Finland Project NESP (294630).

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Authors and Affiliations

  1. Department S.B.A.I., Sapienza Università di Roma, Via A. Scarpa 14, 00161, Rome, Italy

    E. Petronijevic, G. Leahu, A. Belardini, M. Centini, R. Li Voti & C. Sibilia

  2. Optoelectronics Research Centre, Tampere University of Technology, Korkeakoulunkatu 3, 33720, Tampere, Finland

    T. Hakkarainen, E. Koivusalo, M. Rizzo Piton, S. Suomalainen & M. Guina

  3. Departamento de Física, Universidade Federal de São Carlos, CP 676, São Carlos, SP, Brazil

    M. Rizzo Piton

Authors
  1. E. Petronijevic
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  2. G. Leahu
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  3. A. Belardini
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  4. M. Centini
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  5. R. Li Voti
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  6. T. Hakkarainen
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  7. E. Koivusalo
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  9. S. Suomalainen
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  10. M. Guina
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  11. C. Sibilia
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Correspondence to E. Petronijevic.

Additional information

This article is part of the selected papers presented at the 19th International Conference on Photoacoustic and Photothermal Phenomena.

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Petronijevic, E., Leahu, G., Belardini, A. et al. Photo-Acoustic Spectroscopy Reveals Extrinsic Optical Chirality in GaAs-Based Nanowires Partially Covered with Gold. Int J Thermophys 39, 46 (2018). https://doi.org/10.1007/s10765-018-2367-2

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