Excellent Photothermal Conversion of Ti 2O 3 Film for Tuning Terahertz Waves

Abstract

Dynamic tuning of terahertz (THz) wave is vital for the development of next generation THz devices. Utilization of solar energy for tuning THz waves is a promising, eco-friendly, and sustainable way to solve the long-standing energy crisis. Ti 2 O 3 with an ultra-narrow bandgap of 0.1eV exhibits intriguing thermal-induced metal-insulator transition(MIT), and possesses excellent photothermal conversion efficiency. Herein, Ti 2 O 3 film was fabricated by a two-step magnetron sputtering method, and exhibited excellent photothermal conversion efficiency of 90.45% and demonstrated temperature-dependent THz transmission characteristics with a wide-band at 0.1-1 THz. We supposed to combine photothermal conversion characteristics with temperature-dependent THz transmission properties of Ti 2 O 3 film, which could introduce solar light as the energy source for tuning THz waves. Our work will provide new sight for investigating MIT characteristics of Ti 2 O 3 at THz regime and exhibit huge potential in the application of tuning terahertz waves in outdoor scenarios in the future.