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Effect of 1-D photonic crystals on optical transmission of VO2 is studied bydepositing thin films of VO2 nanoparticles on SiO2/TiO2 distributed Braggreflectors (DBR) in the near infrared (IR) spectrum as per earlier theoreticalpredictions of J. Phys. D: Appl. Phys. 51 375102 (2018). Monoclinic VO2nanoparticles with tuned crystallinity were synthesized by a facile solutionprocessing method. Moderately crystalline (MC) and highly crystalline (HC) VO2nanostructures were obtained by varying its synthesis temperature and postgrowth annealing conditions. Both MC VO2 and HC VO2 films exhibit expectedreduction in optical transmission in the IR region due to its structural phasetransition from monoclinic (insulator) to rutile (metallic) around criticaltemperature of 68 {\deg}C. By combining VO2 films on a 40% transmitting DBRstructure, the average optical transmission further went down to ~ 20%. Numberof stacks of DBR plays a key role in such effective reduction of opticaltransmission in IR. When the number of stacks of DBR is further increased from4 to 7, optical transmission of metallic VO2 films on DBR nearly vanishes inNearIR spectrum in such vanadium dioxide/1D photonic crystal based compositephotonic structures. Such temperature controlled, enhanced, broad band opticalresponse can be a promising design for VO2 nanoparticle based hybrid photonicabsorbers for various smart window applications.

Temperature Tunable Optical Transmission control of VO2 nanostructures by IR based 1-D Photonic crystals as hybrid Photonic absorbers