Broadband NIR absorber based on square lattice arrangement in metallic and dielectric state VO2

VO2 is a very promising material due to its semiconductor-metal phase transition, however, the research on fs laser-induced phase transition is still very controversial, which greatly limits its development in ultrafast optics. In this work, the fs laser-induced changes in the optical properties of VO2 films were studied with a variable-temperature Z-scan. At room temperature, VO2 consistently maintained nonlinear absorption properties at laser repetition frequencies below 10 kHz while laser-induced phase transition properties appeared at higher repetition frequencies. It was found by temperature variation experiments at 100 kHz that the modulation depth of the laser-induced VO2 phase transition was consistent with that of the ambient temperature-induced phase transition, which was increased linearly with thickness, further confirming that the phase transition was caused by the accumulation of thermal effects of a high-repetition-frequency laser. The phase transition process is reversible and causes substantial changes in optical properties of the film, which holds significant promise for all-optical switches and related applications.

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Terahertz dual-tunable absorber based on hybrid gold-graphene-strontium titanate-vanadium dioxide configuration

Hu,

Huang,

Yang

et al. 2023

Opt. Mater. Express

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A terahertz dual-tunable polarization-independent metamaterial absorber based on hybrid gold-graphene-strontium titanate (STO)-vanadium dioxide (VO2) configuration is proposed. The results show that the absorption rate of absorber can achieve 98.3% at 0.2 THz. Moreover, both the absorption frequency and absorption rate of the absorber can be dual-tuned by varying the chemical potential of graphene and temperature of STO and VO2. Additionally, the performance of the absorber is theoretically analyzed by using the coupled mode theory (CMT) and impedance matching theory (IMT). Finally, the changes in the absorber's absorption spectra are discussed when the depth of STO and VO2 layers is modified. This work provides a theoretical basis for the designs of dual-tunable absorbers and filters, and also offers a new method for switching and modulation of THz radiation.

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Broadband NIR absorber based on square lattice arrangement in metallic and dielectric state VO2

Cited by 3 publications

References 0 publications

Polarization-independent and all-optically modulated multiband metamaterial coherent perfect absorber

Polarization-independent and all-optically modulated multiband metamaterial coherent perfect absorber

Femtosecond laser-induced phase transition in VO₂ films

Terahertz dual-tunable absorber based on hybrid gold-graphene-strontium titanate-vanadium dioxide configuration

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Broadband NIR absorber based on square lattice arrangement in metallic and dielectric state VO2

Cited by 3 publications

References 0 publications

Polarization-independent and all-optically modulated multiband metamaterial coherent perfect absorber

Polarization-independent and all-optically modulated multiband metamaterial coherent perfect absorber

Femtosecond laser-induced phase transition in VO2 films

Terahertz dual-tunable absorber based on hybrid gold-graphene-strontium titanate-vanadium dioxide configuration

Contact Info

Product

Resources

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Femtosecond laser-induced phase transition in VO₂ films