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Generating Optical Birefringence and Chirality in Silicon Nanowire Dimers

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† †Departments of Chemistry and ‡Electrical and Computer Engineering and The Photonics Center, Boston University, Boston, Massachusetts 02215, United States
*E-mail (B. M. Reinhard): [email protected]
Cite this: ACS Photonics 2017, 4, 9, 2265–2273
Publication Date (Web):August 25, 2017
https://doi.org/10.1021/acsphotonics.7b00501
Copyright © 2017 American Chemical Society
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    Abstract

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    Narrow high refractive index nanowires sustain weakly guided modes with significant mode volume outside of the nanowire. This modal spillover makes them interesting photonic materials for a multitude of applications. In this article we fabricate dimers of nanowires with lengths up to 1.4 μm, radii down to 55 nm, and edge-to-edge separation down to 60 nm through anisotropic etching from crystalline silicon (Si). We investigate how the properties of the weakly confined fundamental HE1,1 mode in Si nanowires are modified by their integration into dimers. In particular, we characterize through a combination of experimental spectroscopy and numerical electromagnetic simulations how the lifting of the degeneracy of HE1,1x and HE1,1y modes in dimers of Si nanowires generates linear birefringence, spin angular momentum, and superchirality. Achiral Si nanowire dimers are found to create locations of strongly enhanced near-field chirality in the gap between the nanowires, where the field can interact with the ambient medium.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsphotonics.7b00501.

    • Numerical simulations of birefringence for tapered silicon nanowire dimers and simulations of backscattering spectra for silicon nanowire dimers with different radii (PDF)

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    Cited By

    This article is cited by 14 publications.

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    2. Saurabh Pandey, Krishnendu Samanta, Jagriti Ahuja, Shereena Joseph, Joby Joseph. Designing a square periodic racemic helix photonic metamaterial using phase-controlled interference lithography for tailored chiral response. Optics & Laser Technology 2024, 172 , 110489. https://doi.org/10.1016/j.optlastec.2023.110489
    3. Chao Xu, Haixia Chen, Jijun Ding, Haiwei Fu. Plasma resonance enhanced electric field and adsorption properties of Ag nanowire based triangular @ circle dimer structures. Physica E: Low-dimensional Systems and Nanostructures 2023, 148 , 115629. https://doi.org/10.1016/j.physe.2022.115629
    4. Emilija Petronijevic, Alessandro Belardini, Grigore Leahu, Roberto Li Voti, Concita Sibilia. Nanostructured materials for circular dichroism and chirality at the nanoscale: towards unconventional characterization [Invited]. Optical Materials Express 2022, 12 (7) , 2724. https://doi.org/10.1364/OME.456496
    5. Emilija Petronijevic, Alessandro Belardini, Grigore Leahu, Teemu Hakkarainen, Marcelo Rizzo Piton, Eero Koivusalo, Concita Sibilia. Broadband optical spin dependent reflection in self-assembled GaAs-based nanowires asymmetrically hybridized with Au. Scientific Reports 2021, 11 (1) https://doi.org/10.1038/s41598-021-83899-2
    6. Grigore Leahu, Emilija Petronijevic, Roberto Li Voti, Alessandro Belardini, Tiziana Cesca, Giovanni Mattei, Concita Sibilia. Diffracted Beams from Metasurfaces: High Chiral Detectivity by Photothermal Deflection Technique. Advanced Optical Materials 2021, 9 (21) https://doi.org/10.1002/adom.202100670
    7. H. Bilge Yağcı, Hilmi Volkan Demir. “Meta-atomless” architecture based on an irregular continuous fabric of coupling-tuned identical nanopillars enables highly efficient and achromatic metasurfaces. Applied Physics Letters 2021, 118 (8) https://doi.org/10.1063/5.0040365
    8. Henrik Mäntynen, Nicklas Anttu, Harri Lipsanen. Nanowire Oligomer Waveguide Modes towards Reduced Lasing Threshold. Materials 2020, 13 (23) , 5510. https://doi.org/10.3390/ma13235510
    9. Yan Hong, Björn M Reinhard. Optoplasmonics: basic principles and applications. Journal of Optics 2019, 21 (11) , 113001. https://doi.org/10.1088/2040-8986/ab490d
    10. Farzad Zangeneh-Nejad, Romain Fleury. Acoustic birefringence via non-Eulerian metamaterials. Journal of Applied Physics 2019, 126 (3) https://doi.org/10.1063/1.5090839
    11. Emilija Petronijevic, Concita Sibilia. Enhanced Near-Field Chirality in Periodic Arrays of Si Nanowires for Chiral Sensing. Molecules 2019, 24 (5) , 853. https://doi.org/10.3390/molecules24050853
    12. E. Petronijevic, G. Leahu, A. Belardini, M. Centini, R. Li Voti, T. Hakkarainen, E. Koivusalo, M. Rizzo Piton, S. Suomalainen, M. Guina, C. Sibilia. Photo-Acoustic Spectroscopy Reveals Extrinsic Optical Chirality in GaAs-Based Nanowires Partially Covered with Gold. International Journal of Thermophysics 2018, 39 (4) https://doi.org/10.1007/s10765-018-2367-2
    13. E. Petronijevic, G. Leahu, A. Belardini, M. Centini, R. Li Voti, T. Hakkarainen, E. Koivusalo, M. Guina, C. Sibilia. Resonant Absorption in GaAs-Based Nanowires by Means of Photo-Acoustic Spectroscopy. International Journal of Thermophysics 2018, 39 (3) https://doi.org/10.1007/s10765-018-2365-4
    14. Xianyu Ao. Surface mode with large field enhancement in dielectric-dimer-on-mirror structures. Optics Letters 2018, 43 (5) , 1091. https://doi.org/10.1364/OL.43.001091
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