Research
(6) Infrared Radiative Switching With Thermally and Electronically Tunable Transition Metal Oxides-Based Plasmonic Grating (link)
Tunability of optical radiative properties are provided through material properties such as thermally tunable negative thermal expansion of graphene and phase transition of vanadium dioxide. In contrast, the optical properties can be manipulated via electronically. One can tune the chemical potential of graphene to shift the plasmonic excitation. Likewise, voltage supply with positive ion insertion can transition its dielectric function, known as electrochromic materials including tungsten trioxide (WO3) and molybdenum trioxide (MoO3) which only requires small ranges of DC voltage supply of plus minus 2 to 3 V. Both WO3 and MoO3 transition to metallic phase as voltage is applied so that its dielectric function can be modeled by Drude model. Interestingly, MoO3 is also temperature dependent where phase transition occurs between 498-623 K. In this work, tunable plasmonic grating is compared between three different transition metal oxides, VO2, cWO3 (crystalline), and MoO3.
Tunability of optical radiative properties are provided through material properties such as thermally tunable negative thermal expansion of graphene and phase transition of vanadium dioxide. In contrast, the optical properties can be manipulated via electronically. One can tune the chemical potential of graphene to shift the plasmonic excitation. Likewise, voltage supply with positive ion insertion can transition its dielectric function, known as electrochromic materials including tungsten trioxide (WO3) and molybdenum trioxide (MoO3) which only requires small ranges of DC voltage supply of plus minus 2 to 3 V. Both WO3 and MoO3 transition to metallic phase as voltage is applied so that its dielectric function can be modeled by Drude model. Interestingly, MoO3 is also temperature dependent where phase transition occurs between 498-623 K. In this work, tunable plasmonic grating is compared between three different transition metal oxides, VO2, cWO3 (crystalline), and MoO3.