Reference : UMR6303-ERIDUJ-001
Workplace : DIJON
Date of publication : Monday, May 2, 2022
Scientific Responsible name : Erik Dujardin
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 September 2022
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
This multi-disciplinary experimental (optics, nanofabrication and numerical simulations) PhD fellowship aims at designing and realizing plasmonic logic gate devices and at studying their optical properties. The research work will comprise three parts: (i) nanofabrication of 2D plasmonic devices by e-beam lithography and focused ion beam (FIB) milling from mesoscopic ultrathin gold crystals; (ii) optoelectronic characterization of the non-linear response and Boolean operation of the reconfigurable logic gates with increasing complexity; (iii) simulations of the observed phenomena using existing codes based on the Green Dyadic method.
A new class of functional integrated and compact computing devices exploit the optoelectronic properties of noble metals such as gold and silver. The confinement and guiding of light at nanometers scales in the deep sub-wavelength regime thanks to plasmon excitations offer a unique opportunity to design new "all-optical" information transfer and processing paradigms. Our group has recently demonstrated a new concept of arithmetic and logic units (ALU, Fig. 1). We now aim at stepping up in complexity and performances to design actual processors.1-3
This PhD fellowship will contribute to the ANR DALHAI project developed in collaboration with CIAD Dijon, a group with advanced expertise in artificial intelligence, with whom we will design the ALU to be nanofabricated and studied at ICB. One major asset of plasmonic devices is the sensitivity of their optical response to electrostatic actuation. This will allow us to explore the next level of integration and reconfiguration at high frequency.4 The main objective of this PhD is to demonstrate, operate and numerically model a 2x2 bits full-adder or equivalent and to design processors of higher Boolean complexity. A second objective is to improve our understanding of the physical processes involved in the opto-electronic modulation of the ALU response.4,5
The candidate will prepare the crystalline Au samples from colloidal suspensions and perform all lithographic/etching/milling steps following two complementary approaches implemented in the ARCEN (ICB, Dijon) and MIMENTO (Femto-ST, Besançon) nanofabrication platforms. The optical response of the devices will be studied on a dedicated non-linear optical setup that allows the multi-foci excitation of the ALU and their electronic addressing in order to reconfigure and modulate (f ~ 1-100 kHz) the Boolean response of the modal plasmonic logic gates and processors.
Experimental images will be compared to numerically simulated maps using an existing code based on the Green Dyadic Method.
The candidate will contribute to the design of complex Boolean ALU assisted by artificial intelligence.
Pre-requisites: A theoretical knowledge of nano/optics and demonstrated skills in experimental optical setup (including microscopy) development and interfacing (LabView) are required. A good background in nanofabrication methods and spoken/written English level C1 are expected. Some knowledge of Python programming will be appreciated.
1 - S. Viarbitskaya, A. Teulle, R. Marty, J. Sharma, C. Girard, A. Arbouet, E. Dujardin, Nature Materials, 12, 426 (2013).
2 - U. Kumar, G. Colas des Francs, A. Bouhelier, E. Dujardin, et al. ACS Photonics, 5, 2328-2335 (2018).
3 - U. Kumar, A. Cuche, C. Girard, S. Viarbitskaya, F. Dell'Ova, R. Al Rafrafin, G. Colas des Francs, S. Bolisetty, R. Mezzenga, A. Bouhelier, E. Dujardin
ACS Nano, 15, 13351-13359 (2021).
4 - A. V. Uskov, J. B. Khurgin, M. Buret, A. Bouhelier, I. V. Smetanin, and I. E. Protsenko, ACS Photonics, 4, 1501-1505 (2017).
5 - K. Malchow and A. Bouhelier, J. Opt. Soc. Am. B, 38, 576 (2021).
This PhD Fellowship will take place in ICB (UMR Université Bourgogne Franche-Comté CNRS 6303) in the PRISM team (https://icb.u-bourgogne.fr/en/near-field-optics/) the main research topics of which are : Physics of sub-lambda media; Nonlinear nanophotonics; Nanophotonic and plasmonic components; Nanophotonic and plasmonic circuitry; Integrated optical nanosources; Quantum plasmonics.
This PhD project will benefit from a top-class experiemental optics environement as well as stae-of-the-art nanofabrication, characterization and simulation facilities.
This project will be co-supervised by Erik Dujardin (http://scholar.google.fr/citations?user=502SHhMAAAAJ) and by Alexandre Bouhelier (https://icb.u-bourgogne.fr/equipe/alexandre-bouhelier/)
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