Abstract

The plasmonic nanoantenna has attracted intensive attention over the last decades owing to its unique optical response. Although various nanoantennas have been designed, so far very few efforts have been devoted to their dynamic tunability. Here we present a study on dynamically tunable bowtie nanoantennas integrated on a vanadium dioxide thin film with a thermal phase transition. The insulator–metal transition of vanadium dioxide changes its electric feature and permittivity; hence, the resonance of the bowtie nanoantennas is actively tuned by varying the temperature of the device. Further, by adjusting the gap of the bowtie and the edge size of the nanotriangle at a different temperature, the shift of the resonant wavelength of the nanoantenna has been found to increase for a larger triangle edge size, but less dependent on the gap width. The features suggest that ${\mathrm{VO}}_2$-integrated nanoantennas may have applications in dynamically tunable high-harmonic generation, single-molecule fluorescence enhancement, and nanolasers.

© 2019 Optical Society of America

Switchable transmissive and reflective metadevices based on the phase transition of vanadium dioxide

Dong-Qin Zhang, Yi Tao, Gui-Ming Pan, Zhong-Wei Jin, Bin Fang, Zhi Hong, and Fang-Zhou Shu
Opt. Lett. 47(23) 6073-6076 (2022)

Active gratings tuned by thermoplasmonics-induced phase transition in vanadium dioxide thin films

B. H. Wu, X. F. Xu, and C. R. Wang
Opt. Lett. 41(24) 5768-5771 (2016)

High spatial resolution recording of near-infrared hologram based on photo-induced phase transition of vanadium dioxide film

Xiubao Sui, Junjie Zeng, Qian Chen, and Guohua Gu
Opt. Lett. 40(7) 1595-1598 (2015)

Tunable optical antennas enabled by the phase transition in vanadium dioxide

Stuart K. Earl, Timothy D. James, Timothy J. Davis, Jeffrey C. McCallum, Robert E. Marvel, Richard F. Haglund, and Ann Roberts
Opt. Express 21(22) 27503-27508 (2013)

Tunable near-infrared Gires–Tournois resonators based on vanadium dioxide on gold film

Ahmad Khayyat Jafari, Matthew Gaddy, Yu-Che Ho, Ceren Uzun, Vladimir Kuryatkov, Sergey A. Nikishin, Myoung-Hwan Kim, Luis Grave de Peralta, and Ayrton A. Bernussi
Opt. Lett. 47(3) 645-648 (2022)