Ultra-thin perfect absorber employing a tunable phase change material | Zendy

Mikhail A. Kats | Zendy; Deepika Sharma | Zendy; Jiao Lin | Zendy; Patrice Genevet | Zendy; Romain Blanchard | Zendy; Zheng Yang | Zendy; M. M. Qazilbash | Zendy; D. N. Basov | Zendy; Shriram Ramanathan | Zendy; Federico Capasso | Zendy

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Ultra-thin perfect absorber employing a tunable phase change material

Author(s) -

Mikhail A. Kats,

Deepika Sharma,

Jiao Lin,

Patrice Genevet,

Romain Blanchard,

Zheng Yang,

M. M. Qazilbash,

D. N. Basov,

Shriram Ramanathan,

Federico Capasso

Publication year - 2012

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4767646

Subject(s) - materials science , opacity , optoelectronics , sapphire , thin film , dielectric , absorption (acoustics) , optics , emissivity , phase (matter) , layer (electronics) , wavelength , substrate (aquarium) , laser , nanotechnology , composite material , chemistry , oceanography , organic chemistry , geology , physics

We show that perfect absorption can be achieved in a system comprising a single lossy dielectric layer of thickness much smaller than the incident wavelength on an opaque substrate by utilizing the nontrivial phase shifts at interfaces between lossy media. This design is implemented with an ultra-thin (∼λ/65) vanadium dioxide (VO2) layer on sapphire, temperature tuned in the vicinity of the VO2 insulator-to-metal phase transition, leading to 99.75% absorption at λ = 11.6 μm. The structural simplicity and large tuning range (from ∼80% to 0.25% in reflectivity) are promising for thermal emitters, modulators, and bolometers.

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