Tailoring thermal emission with incandescent metasurfaces
Tailoring thermal emission
Infrared thermal sources...faster than LEDs !
During the last decades, various research groups have managed to design and fabricate devices based on thermal emission providing light with controlled angular distribution, narrow band spectrum, or easily modulable at high frequencies. This is generally done by heating the integrality of the emitting device or by modulating at high speed the emissivity of the active material.
In our team, we adopted a different approach ; the incandescent emitters we chose, are really tiny : they are nano-emitters. When placed on an adequate substrate , they can cool down within tens of nanoseconds, thanks to their small thickness. However, such qmall pieces of matter cannot emit much light when heated. To compensate this rather small intrinsic emission, we design, fabricate and characterize architectures of nanodevices by following the principles of the local formulation of the Kirchhoff's law. In other words, we design structures that maxumize light absorption. This enables us reciprocally to identify structures benefiting from interesting antenna effects, potentially enhancing the total emission by several orders of magnitude.
PhD student 2022
Téléphone / Bureau : +1 33 64 53 34 53 / R2.6
Dr. Léo Wojszvzyk
PhD Student 2019
Léo defended his thesis in 2019 and joined the DGA. His thesis title :
"Fast modulation of infrared emission by incandescent metasurfaces"
Efficiency optimization of mid-infrared incandescent sources with time-varying temperature
Authors : Anne Nguyen, Jean-Jacques Greffet
DOI : https://doi.org/10.1364/OME.443129
Opt. Mat. Express 12, 225 (2022)
An incandescent metasurface for quasimonochromatic polarized mid-wave infrared emission modulated beyond 10 MHz
Authors : Léo Wojszvzyk, Anne Nguyen, Anne-Lise Coutrot, Cheng Zhang, Benjamin Vest jean-Jacques Greffet
DOI : 10.1038/s41467-021-21752-w
Nature Communications volume 12, Article number: 1492 (2021)
Enhancing thermal radiation with nanoantennas to create infrared sources with high modulation rates
Authors : Emilie Sakat, Léo Wojszvzyk, Jean-Paul Hugonin, Mondher Besbes, Christophe Sauvan, Jean-Jacques Greffet
DOI : 10.1364/OPTICA.5.000175
Optica, Optical Society of America (OSA), 2018, 5 (2), pp.175-179
Light Emission by Non-Equilibrium bodies : Local Kirchhoff Law
Authors : Jean-Jacques Greffet, Patrick Bouchon, Giovanni Brucoli, François Marquier
DOI : 10.1103/PhysRevX.8.021008
Phys. Rev. X, 8 (2) 021008 (2018)
Light Emission by a Thermalized Ensemble of Emitters Coupled to a Resonant Structure
Authors : Léo Wojszvzyk, Hector Monin, Jean-Jacques Greffet
DOI : 10.1002/adom.201801697
Adv. Optical Mater. 2019, 1801697