Pure optical phase control with vanadium dioxide thin films
| Autor: | Alain Haché, Tran Vinh Son, K. Zongo, C. Ba, Gisia Beydaghyan |
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| Rok vydání: | 2014 |
| Předmět: |
Phase transition
Materials science business.industry Physics::Optics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Wavelength Optics Amplitude Transmittance Electrical and Electronic Engineering Physical and Theoretical Chemistry Thin film business Refractive index Phase modulation Group delay and phase delay |
| Zdroj: | Optics Communications. 320:151-155 |
| ISSN: | 0030-4018 |
| Popis: | Under certain conditions, films made of vanadium dioxide exhibit wavelengths at which transmittance or reflectance do not change as the material undergoes insulator to metal phase transition, in spite of refractive index changes on the order of unity. Exploiting this effect, we demonstrate control of optical phase at 800 nm in transmission and at 1310 nm in reflection. With a 68 nm film, the optical phase is adjusted while leaving all other properties of light unchanged, including amplitude, polarization and frequency. The phase change per unit of propagated distance is Δk=107 rad/m, orders of magnitude higher than typically obtained with electro-optic effects. We discuss potential application to nano-sized phase devices or thin film lenses. |
| Databáze: | OpenAIRE |
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