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Reference : UMR6174-NICPAS-001
Workplace : BESANCON
Date of publication : Monday, January 11, 2021
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 March 2021
Proportion of work : Full time
Remuneration : From 2500 to 3500 € gross salary per month, depending on experience.
Desired level of education : PhD
Experience required : Indifferent
Probing an atomic vapor contained by a mm-scaled cell has allowed the demonstration and the development of a variety of high-sensitivity and high-precision chip-scale atomic devices . Among these instruments, we can in particular mention the miniaturized microwave atomic clocks . These “micro-atomic clocks” relies on a microfabricated buffer-gas filled alkali cell. They are now commercially available [3, 4] thanks to their very high potential resulting from their ability to combine fractional frequency stability in the order of 10-10 at 1 s and 10-11 at 1 day integration time and strongly reduced volume as well as power consumption (about 15 cm3 and 150 mW). Recently, many works have shown the interest of shifting towards optical frequencies, by probing directly in a pure alkali microcell (without buffer gas) an atomic transition instead of a microwave one. [5, 6, 7]. These novel microcell-based optical clocks show much better (2 orders of magnitude) short-term stabilities. Nevertheless, the mid- and long-term stabilities of both microwave and optical miniaturized clocks should still be improved. In this framework, our studies focus on the development of new cell architectures aiming at improving and stabilizing their internal atmosphere while including micro-optical functionalities in order to ease and increase the light-atoms interaction. Consequently, the present offer concerns the development and characterization of micro-fabricated alkali vapor cells for high performances miniaturized atomic frequency references.
 J. Kitching, Appl. Phys. Rev. 5, 031302 (2018)
 S. Knappe, MEMS atomic clocks, Comprehensive microsystems, 3, 571-612 (2007).
 Z. Newman et al., Optica 6, 5, 580 (2018).
 D. Brazhnikov et al., Phys. Rev. A 99, 062508 (2019).
 V. Maurice et al., Optics Express 28, 17, 24708 (2020).
Development and characterization of micro-fabricated alkali vapor cells for high performances miniaturized atomic frequency references.
- Study and optimisation of different filling techniques.
- Integration of micro-optical components to the studied cells.
- Characterization of the different technological developments, in the context of the long-term performances improvement of microcell-based atomic clocks.
The candidate must hold a PhD thesis. He (She) should enjoy applied physics sciences. Particular attention will be paid to his (her) experience with clean-room technologies (optical and electronic lithography, dry and wet etching, anodic bonding) as well as optical instrumentation. He (She) should enjoy team working.
The candidate will integrate the MOSAIC team (https://teams.femto-st.fr/MOSAIC/) at FEMTO-ST Micro Nano Sciences & Systems department (www.femto-st.fr) and will evolve within the “miniaturized clock” project team, made also from people of the OHMS group (http://teams.femto-st.fr/equipe-ohms/) from Time-Frequency department. The project team gathers 3 permanent researchers, 2 post-docs and 2 PhD students. The candidate will participate to 2 projects, funded by the French National Research Agency (ANR ASTRID DGA) and by the National Centre for Space Studies (CNES). He (She) will aim at publishing his (her) work in peer-reviewed journals and will be able to participate to international conferences.
Constraints and risks
Regarding the amount of acitvity in clean room, the candidate should be familiar with chemical risks. Cell filling and characterization involve risks related to LASERS.
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