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Highly directional second-harmonic generation from AlGaAs nanoparticles (Conference Presentation)

Paper Abstract

Metallic nanoantenna possess versatile scattering properties enabling to engineer the emission directionality at the nanoscale. However, due to their Ohmic losses and low heat resistance they cannot be practically applied in nonlinear optical processes for optical frequency conversion. Dielectric nanoparticles, e.g. silicon and germanium, are good candidates to overcome these limitations [1, 2]. Nevertheless, the centrosymmetric nature of these materials have voided the second-harmonic generation (SHG). Alternatively, the use of GaAs-based III-V semiconductors, with non-centrosymmetric structures, can overcome this difficulty [3,4]. However, fabrication of III-V semiconductor nanoantennas on low refractive index substrates remains very challenging, blocking the possibility to explore the SHG directionality in both forward and backward direction. Here, for the first time to our knowledge, we design and fabricate high-quality AlGaAs nanostructures on a glass substrate. Through this novel platform, we manage to excite, control and detect backward and forward nonlinear signals by SHG in AlGaAs nanodisks [5,6]. In particular, we observe that for certain size of nanoantenna, the SHG emission has a complex spatial distribution polarization state corresponding to radial polarization in the forward direction and a polarization state of a more general nature in the backward direction. Furthermore, we demonstrate an unprecedented SHG conversion efficiency of 10-4. Our breakthrough can open new avenues for enhancing the performance of photodetection, light emission and sensing.v

Paper Details

Date Published: 15 August 2017
PDF: 1 pages
Proc. SPIE 10228, Nonlinear Optics and Applications X, 102280H (15 August 2017); doi: 10.1117/12.2264351
Show Author Affiliations
Maria del Rocio Camacho Morales, The Australian National Univ. (Australia)
Mohsen Rahmani, The Australian National Univ. (Australia)
Sergey S. Kruk, The Australian National Univ. (Australia)
Lei Wang, The Australian National Univ. (Australia)
Lei Xu, The Australian National Univ. (Australia)
Nankai Univ. (China)
Daria A. Smirnova, The Australian National Univ. (Australia)
Alexander S. Solntsev, The Australian National Univ. (Australia)
Andrey E. Miroshnichenko, The Australian National Univ. (Australia)
Hark Hoe Tan, The Australian National Univ. (Australia)
Fouad Karouta, The Australian National Univ. (Australia)
Shagufta Naureen, The Australian National Univ. (Australia)
Kaushal D. Vora, The Australian National Univ. (Australia)
Luca Carletti, Univ. degli Studi di Brescia (Italy)
Costantino De Angelis, Univ. degli Studi di Brescia (Italy)
Chennupati Jagadish, The Australian National Univ. (Australia)
Yuri S. Kivshar, The Australian National Univ. (Australia)
Dragomir N. Neshev, The Australian National Univ. (Australia)


Published in SPIE Proceedings Vol. 10228:
Nonlinear Optics and Applications X
Mario Bertolotti; Joseph W. Haus; Alexei M. Zheltikov, Editor(s)

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