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

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.