Quartz Crystal Resonator Used as an Optical Fabry-Perot Cavity for Optomechanical Coupling

Rosenziveig, Kevin; Bon, Jérémy; Abbé, Philippe; Soumann, Valérie; Giust, Remo; Passilly, Nicolas; Galliou, Serge; Cohadon, P.-F.

doi:10.1109/ifcs-isaf41089.2020.9234952

Cited by 1 publication

(2 citation statements)

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“…For example, the Fabry-Perot cavity with 35 nm of silver on quartz has a (theoretical) optical finesse of 80 at room temperature, which grows up to 100 at 4 K. The maximum transmission is almost doubled, from 1% at room temperature to 1.8% at 4 K. The contrast of the reflection (i.e. 1 − 𝑅 min /𝑅 max ) goes from 18% at room temperature to 65% at 4 K. The maximum absorption goes from 50% at room temperature to 40% at 4 K. All these quantities are therefore improved at 4 K, although this improvement seems insufficient to actuate an optomechanical coupling with radiation pressure in our case [15].…”

Section: Results Discussionmentioning

confidence: 64%

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Measurement of the refractive index at cryogenic temperature of absorptive silver thin films used as reflectors in a Fabry–Perot cavity

et al. 2021

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Data on the refractive index of silver thin films are scarce in the literature, and largely dependent on both the deposition method and thickness. We measure the refractive index of silver films at cryogenic temperature with a technique that takes advantage of the absorption of the films and the corresponding peculiar properties of Fabry–Perot cavities: a frequency shift between the reflection and transmission peaks, together with a modified cavity bandwidth. We demonstrate a decrease in the real value of the refractive index, together with a decrease in its imaginary value at 4 K.

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Section: Results Discussionmentioning

confidence: 64%

“…Through the measurement of the frequency shift between the transmitted and reflected peaks [20] [15] and the Full Width at Half Maximum (FWHM) of the transmitted peak (see Fig. 1), it is possible to retrieve the complex refractive index ñ = 𝑛 − 𝑖𝑘.…”

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confidence: 99%