Open AccessLarge‐Area Plasmonic Switches Based on Crystalline Au Nanoparticles Between VO 2 Layers for Enhanced Switching in Visible–Near‐Infrared Regime
Author(s) -
Agrawal Ajay Kumar,
Das Abhijit,
Gupta Nitin,
Kumar Kamal,
Dhawan Anuj
Publication year - 2022
Publication title -
advanced photonics research
Language(s) - English
Resource type - Journals
ISSN - 2699-9293
DOI - 10.1002/adpr.202100253
Subject(s) - materials science , nanoparticle , optoelectronics , pulsed laser deposition , surface plasmon resonance , plasmon , phase (matter) , laser , wavelength , fabrication , infrared , optical switch , substrate (aquarium) , visible spectrum , thin film , nanotechnology , optics , chemistry , medicine , physics , alternative medicine , pathology , oceanography , geology , organic chemistry
Vanadium dioxide (VO 2 ) undergoes a reversible phase change, from semiconducting to metallic, with a change in temperature. Herein, plasmonic switches–based on gold nanoparticles (Au NPs) embedded between layers of VO 2 films–that exhibit enhanced switching of the optical transmission as the temperature is increased above the VO 2 phase transition threshold are presented. The operating wavelength of the switching device can be tuned between 650 and 1000 nm using the localized surface plasmon resonance properties of the Au NPs. This is for the first time that plasmonic switches have been demonstrated in the visible spectral regime (i.e., for wavelengths shorter than 700 nm) when VO 2 is employed as the phase change material. A higher switchability, i.e., a higher extinction ratio upon phase transition of VO 2 , than what has been shown earlier in the spectral regions less than 1000 nm is demonstrated experimentally and theoretically. All the device layers are grown at the same substrate temperature and laser intensity via a single‐vacuum pulsed laser deposition process, leading to a simplified large‐area fabrication process. It is also shown for the first time that the Au NPs embedded in the proposed Au‐VO 2 nanocomposites are crystalline.