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A molecular spin-crossover film allows for wavelength tuning of the resonance of a Fabry–Perot cavity

Abstract : We harness the remarkable refractive index switching (0.04 < Δn(λ) < 0.2) between the low-spin and high-spin states of the molecular spin-crossover (SCO) complex [Fe(HB(1,2,4-triazol-1-yl)3)2] to realize a wavelength-tunable Ag/SCO/Ag multilayer Fabry–Perot cavity. This tuneability is coupled with low absorption losses (k ≤ 10−4) between 350 and 1000 nm providing scope for reconfigurable and self-adaptive photonics applications in the visible spectral region.
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Yuteng Zhang, Karl Ridier, Victoria Shalabaeva, Isabelle Séguy, Sylvain Pelloquin, et al.. A molecular spin-crossover film allows for wavelength tuning of the resonance of a Fabry–Perot cavity. Journal of Materials Chemistry C, Royal Society of Chemistry, 2020, 8 (24), pp.8007-8011. ⟨10.1039/d0tc02094j⟩. ⟨hal-02882283⟩

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