Thermal induced tunability of surface plasmon resonance in Au–VO2 nano-photonics

Surface Plasmon Resonance Tunability in Au−VO2 Thermochromic Nano-composites

“…These conical-like topography with approximately 193.2 nm in base and 27.9 nm in height within the surface is related to the columnar growth mechanism in the transversal direction well established in the case of this type of nano-composites synthesized by sputtering and laser ablation. The XRD investigations with Cuk␣ radiations of 1.54 Å, showed that the VO 2 host matrix presents an effective (111) crystalline orientation (51). Likewise, the large intensity of a Bragg peak located at 2 Ϸ 38.22 ±0.08 deg indicates the presence of crystalline Au nano-particles with a possible cubic structure of (111) orientation.…”

“…This hysteresis corresponding to the heating-cooling phenomenon of the host VO 2 matrix is related to the degree of crystallinity of the host matrix (55)(56)(57). The sharpness of the temperature variation of the surface plasmon wavelength in the vicinity of Tc is due to the fact that the host VO 2 matrix is highly crystalline as shown by the principal VO 2 narrow (111) Bragg peak (51). Such a high epitaxial growth extent is a characteristic of the laser deposition in vacuum procedure (57).…”

Phase evolution of vanadium oxides obtained through temperature programmed calcinations of ammonium vanadate in hydrogen atmosphere and their humidity sensing properties

“…Such properties are changes in electrical resistance or conductance, optical transmittance or reflectance, phonon frequencies from Raman spectroscopy and FTIR, surface plasmon resonance from absorption spectra and light scattering studies [14,[17][18][19][20][21].…”

Thermochromic nanocrystalline Au–VO2 composite thin films prepared by radiofrequency inverted cylindrical magnetron sputtering

“…Since the surface plasmon resonance wavelength (λ SPR ) depends on their particle size, shape, inter-particle distance and the dielectric function of the surrounding host [9][10][11][12][13], the tunable λ SPR in the visible and near infrared regions has been achieved by changing these parameters of the metallic nanoparticles [9][10][11][12][13][14]. Recently, a great interest has been made to tune λ SPR of noble metal nanoparticles by using dielectric functional materials such as thermochromic [15][16][17][18], electrochromic [19] or photochromic [20], as the matrices. The use of dielectric functional materials as the matrices opens a range of possibilities for tuning the λ SPR in a controllable manner.…”

“…The use of dielectric functional materials as the matrices opens a range of possibilities for tuning the λ SPR in a controllable manner. Recently, the effect of external temperature stimuli on the plasmon resonance of Au or Ag nanoparticles embedded in a thermochromic VO 2 matrix, of composite Au-VO 2 [17,18] or Au-on-VO 2 core shell particles [8,21] or Ag on top of VO 2 [15] has been sparsely explored with only few reports. It is well-known that VO 2 undergoes a reversible first-order phase transition from semiconductor to metal at critical temperature Tc = 68 o C, accompanied by large change in optical properties in the infrared region [22][23][24] which will be exploited to modulate the λ SPR .…”