Geoffroy Lerosey Institut Langevin, CNRS – ESPCI ParisTech 1 rue Jussieu, 75005 Paris, France Postdoctoral fellowship available for 1 or 2 years “Wave propagation at the deep subwavelength scale in locally resonant metamaterials » In the last pas years, we have analyzed in a new way the propagation of electromagnetic and acoustic waves in locally resonant media, that is, metamaterial made out of resonant unit cells. This has for example permitted us to develop new methods to image and focus from the far field beyond the diffraction limit in acoustics (Fig a), microwave or optics [1-3]. Similarly, we have adopted a microscopic approach to those media and proved that under some circumstances, they can be used as photonic or phononic crystals to guide, confine, and control waves (Fig b), with the very difference that now this can be done at the deep subwavelength scale [4-5]. Figure: a) deep subwavelength focal spot obtained using far field time reversal on top of an array of soda cans, and b) waveguiding microwaves at the deep subwavelength scale in an array of locally modified resonant electric wires We have just received a positive response for a grant proposal aimed at following these efforts in the understanding and utilization of locally resonant metamaterials, which includes a two years postdoc fellowship. The idea of the project is to develop fully the equivalence between metamaterials and crystals, to underline the limitations of the equivalence, and to propose new concepts based on this idea. In particular, we will seek ways to engineer near field coupling in metamaterials and to zero it, we will study metamaterials made out of different kinds of resonant unit cells (like diatomic crystals) as well as media made out of different spatial scales. We will also study the effect of introducing disorder in this kind of media by using unit cells which present a disordered distribution of resonance frequencies. We will finally develop applications based on our ideas, for instance we would like to develop deep subwavelength waveguides which present very high group index for radar or telecommunication applications in the microwave domain, or deep subwavelength cavities for enhanced light/matter interactions throughout the spectrum. The workload includes simulations in acoustics microwave or other electromagnetic areas (Comsol, CST), experimental work in acoustics and microwave, as well as theoretical works. We have already two permanents working on the projects as well as two PhD students. The candidate should have a PhD in solid state physics, electrical engineering or acoustics, with a solid expertise in metamaterials, photonic/phononic crystals or related topics such as spoof plasmons or so. The candidate can be more experimental, simulation or theory oriented, but a transverse profile who can work on every aspect is preferred. The background of the candidate can be either acoustics or EM, since we will work in both areas, and since they are very similar. We are looking for someone autonomous and creative, we will appreciate to interact with other researchers. The candidate should have a good record of publication, although motivation and passion for wave physics will be the main criteria of selection. 1 - Lemoult, F., Lerosey, G., de Rosny, J. and Fink, M. “Resonant Metalenses for Breaking the Diffraction Barrier”. Physical Review Letters 104, 203901, (2010). 2 - Lemoult, F., Fink, M. and Lerosey, G. “Acoustic resonators for far field control of sound on a subwavelength scale”. Physical Review Letters 107, 064301 (2011). 3 - Lemoult, F., Fink, M. and Lerosey, G. “A polychromatic approach to far field superlensing at visible wavelengths”. Nature Communications 3, 889 (2012). 4 - Lemoult, F., Kaïna, N., Fink, M. and Lerosey, G. “Wave propagation control at the deep subwavelength scale in metamaterials”. Nature Physics 9, 55–60 (2013). 5 - Kaïna, N., Lemoult, F., Fink, M. and Lerosey, G. “Ultra-low mode volumes defect cavities in ordered and disordered metamaterials”. Applied Physics Letters 102, 144104 (2013). How to apply: Send CV and letter to [email protected] 1 or 2 years possible, preferably 1 year contract renewed. The postdoc can start any time from October 1st to January 1st. (Dates could be more flexible for excellent candidates) Salary between 2150e/months up to 2800e/months depending on experience.