In:
Journal of Applied Physics, AIP Publishing, Vol. 125, No. 16 ( 2019-04-28)
Abstract:
We investigate the terahertz optical properties of VO2 (M) films synthesized hydrothermally on a c-sapphire substrate by a two-step method. The terahertz transmittance is greater than 70% for the insulating state of monoclinic VO2 films, and the average modulation depth approaches 94% for frequencies of 0.2–2.0 THz. A sample prepared using 450 °C postannealing undergoes a sharp insulator–metal transition around 61 °C at 1.5 THz with a 97% modulation depth. Furthermore, the effects of the postannealing temperature on the structure, morphology, and phase-transition properties of VO2 film/c-sapphire samples are presented. The results show that the hydrothermal synthesis of VO2 polymorphs has potential applications in the terahertz wavelength range.
Type of Medium:
Online Resource
ISSN:
0021-8979
,
1089-7550
Language:
English
Publisher:
AIP Publishing
Publication Date:
2019
detail.hit.zdb_id:
220641-9
detail.hit.zdb_id:
3112-4
detail.hit.zdb_id:
1476463-5
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