Mid‐infrared Plasmonic Resonances in 2D VO₂ Nanosquare Arrays

Abstract

Plasmon resonances on 2D nanosquare arrays and their temperature‐dependent modulations are demonstrated using the insulator‐to‐metal transition (IMT) of VO2. A comparison between observed experimental trends and electromagnetic simulations reveals that the plasmon coupling is effective in the periodic 2D alignment of metallic VO2 nanosquares and results in a collective plasmon excitation. This plasmon excitation affects the optical responses of VO2 nanosquares in the mid‐infrared (IR) range through reduction of plasmon damping in relation to the specific band structure of VO2. This preliminary understanding is important for the elucidation of temperature‐dependent plasmon resonances. The IMT of VO2 produces temperature‐dependent plasmon resonances with respect to spectral features. The electrodynamic simulations reveal that these phenomena are based on plasmon coupling in the nanosquare array when each nanosquare acts as a single metallic domain. The hysteretic plasmon resonances are derived from resonant coupling between metallic VO2 nanosquares via the IMT nature of VO2, which results in temperature‐dependent changes in collective plasmon excitations in the nanosquare array.

Vanadium Dioxide Integrated Metasurfaces with Switchable Functionalities at Terahertz Frequencies

“…However, the implemented approach suffers from intrinsic crosstalk between different polarizations, and the efficiency of each functionality is inevitably limited due to its polarization‐sensitive nature. To realize diversified functionalities, an alternative way is to hybridize metasurfaces with active functional materials, such as phase‐change materials (PCM) . While PCM integrated metasurfaces have been successfully demonstrated to achieve the active configuration control, metasurfaces processing multiple distinct functionalities over a wide wavelength/frequency range still remain largely unexplored.…”

Polaritonic-to-Plasmonic Transition in Optically Resonant Bismuth Nanospheres for High-Contrast Switchable Ultraviolet Meta-Filters

“…In other words, these metamaterials are based on two separated types of functional elements: resonators (the noble metal nanostructures) and switch (the tunable matrix/subtrate). However, in order to achieve a local reconfigurability of the metamaterial down to the nanoscale demanded for an ultimate control in the light-metamaterial interaction, it will be desirable that these two functionalities (resonator and switch) could be merged in a single nanoscale element, 14 with a markedly subwavelength size. This requires nanostructures presenting a strong sensitivity of their dielectric function to external stimuli, that could therefore be supported on/embedded in usual (non-tunable) dielectric substrates/matrices.…”

Electrochemical gating-induced reversible and drastic resistance switching in VO2 nanowires

“…Of the prototypical materials, VO 2 is promising as it undergoes a metal-insulator transition (MIT) and the resistance changes by orders of magnitude around 340 K. In VO 2 nano to microstructures5678910111213, the coupling of the MIT with mechanical789, optical13, thermal12 and electronic properties911 can be used in tunable resonators, optical switchers, electronic and thermo-sensing devices. Furthermore, only a few atomic percent of the hydrogen- or oxygen-intercalation and -desorption in VO 2 cause drastic changes in the transport properties, equal to that caused by inducing the MIT14151617181920.…”