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Directional second harmonic generation from AlGaAs nanoantennas (Conference Presentation)

Paper Abstract

Optical nanoantennas possess great potential for controlling the spatial distribution of light in the linear regime as well as for frequency conversion of the incoming light in the nonlinear regime. However, the usually used plasmonic nanostructures are highly restricted by Ohmic losses and heat resistance. Dielectric nanoparticles like silicon and germanium can overcome these constrains [1,2], however second harmonic signal cannot be generated in these materials due to their centrosymmetric nature. GaAs-based III-V semiconductors, with non-centrosymmetric crystallinity, can produce second harmonic generation (SHG) [3]. Unfortunately, generating and studying SHG by AlGaAs nanocrystals in both backward and forward directions is very challenging due to difficulties to fabricate III-V semiconductors on low-refractive index substrate, like glass. Here, for the first time to our knowledge, we designed and fabricated AlGaAs nanoantennas on a glass substrate. This novel design allows the excitation, control and detection of backwards and forwards SHG nonlinear signals. Different complex spatial distribution in the SHG signal, including radial and azimuthal polarization originated from the excitation of electric and magnetic multipoles were observed. We have demonstrated an unprecedented SHG conversion efficiency of 10-4; a breakthrough that can open new opportunities for enhancing the performance of light emission and sensing [4]. References [1] A. S. Shorokhov et al. Nano Letters 16, 4857 (2016). [2] G. Grinblat et al. Nano Letters 16, 4635 (2016). [3] S. Liu et al. Nano Letters 16, 7191 (2016). [4] R. Camacho et al. Nano Lett. 16, 7191 (2016).

Paper Details

Date Published: 21 September 2017
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Proc. SPIE 10343, Metamaterials, Metadevices, and Metasystems 2017, 103430J (21 September 2017); doi: 10.1117/12.2273553
Show Author Affiliations
Maria del Rocio Camacho Morales, Australian National Univ. (Australia)
Mohsen Rahmani, The Australian National Univ. (Australia)
Sergey S. Kruk, Australian National Univ. (Australia)
Lei Wang, Australian National Univ. (Australia)
Lei Xu, Australian National Univ. (Australia)
Nankai Univ. (China)
Daria A. Smirnova, Australian National Univ. (Australia)
Alexander S. Solntsev, Australian National Univ. (Australia)
Andrey E. Miroshnichenko, Australian National Univ. (Australia)
Hoe Tan, Australian National Univ. (Australia)
Fouad Karouta, Australian National Univ. (Australia)
Shagufta Naureen, Australian National Univ. (Australia)
Kaushal D. Vora, Australian National Univ. (Australia)
Luca Carletti, Univ. degli Studi di Brescia (Italy)
Costantino De Angelis, Univ. degli Studi di Brescia (Italy)
Chennupati Jagadish, Univ. degli Studi di Brescia (Italy)
Yuri S. Kivshar, Australian National Univ. (Australia)
Dragomir N. Neshev, Australian National Univ. (Australia)


Published in SPIE Proceedings Vol. 10343:
Metamaterials, Metadevices, and Metasystems 2017
Nader Engheta; Mikhail A. Noginov; Nikolay I. Zheludev, Editor(s)

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