Dynamic Control of Photoresponse in VO2 Through Phase Manipulation
Journal
Advanced Optical Materials
Journal Volume
13
Journal Issue
30
Start Page
e01935
ISSN
2195-1071
2195-1071
Date Issued
2025-09-08
Author(s)
Cheng, Hao‐Yu
Ye, Ming‐Jyun
Chen, Lu‐Hsing
Wang, Yen‐Yu
Huang Yen‐Lin
Lu, Yu‐Jung
Chen, Kuo‐Ping
Lin, Kung‐Hsuan
Abstract
Vanadium dioxide (VO2), a representative phase-transition material, exhibits nonlinear optical responses during its transition from an insulating to a metallic state. By investigating the transient photoresponses of a VO2 thin film at different temperatures, additional slow-growth and hybrid phases are discovered between the insulating phase at low-temperature and metallic phase at high-temperature. The amplitude of the VO2 photoresponse at 68 °C in the slow-growth phase is observed to be 5.5 times greater than that at room temperature. The controllability of relaxation time is also demonstrated from a few tens of picoseconds to a few nanoseconds. The optimized conditions for all-optical modulation applications are explored.
Subjects
all-optical switches
phase transition material
photoexcitation
ultrafast spectroscopy
Publisher
Wiley
Type
journal article