المؤلفون: Méjard, R., Verdy, A., Demichel, O., Petit, M., Markey, L., Herbst, F., Chassagnon, R., Colas-des-Francs, G., Cluzel, B., Bouhelier, A.

المصدر: Optical Materials Express Vol. 7, Issue 4, pp. 1157-1168 (2017)

مصطلحات موضوعية: Physics - Optics

الوصف: A nanofabrication process for realizing optical nanoantennas carved from a single-crystal gold plate is presented in this communication. The method relies on synthesizing two-dimensional micron-size gold crystals followed by the dry etching of a desired antenna layout. The fabrication of single-crystal optical nanoantennas with standard electron-beam lithography tool and dry etching reactor represents an alternative technological solution to focused ion beam milling of the objects. The process is exemplified by engineering nanorod antennas. Dark-field spectroscopy indicates that optical antennas produced from single crystal flakes have reduced localized surface plasmon resonance losses compared to amorphous designs of similar shape. The present process is easily applicable to other metals such as silver or copper and offers a design flexibility not found in crystalline particles synthesized by colloidal chemistry.

URL الوصول: http://arxiv.org/abs/1703.03716

المؤلفون: Briere, G., Cluzel, B., Demichel, O.

مصطلحات موضوعية: Physics - Optics

الوصف: Although Epsilon-Near-Zero metamaterials (ENZ) offer many unconventional ways to play with light, the optical impedance mismatch with surroundings can limit the efficiency of future devices. We report here on the improvement of the transmittance of an Epsilon-Near-Zero (ENZ) wavefront shaper. We first address in this paper the way to enhance the transmittance of a plane wave through a layer of ENZ material thanks to a numerical optimization approach based on the Transfer Matrix Method. We then transpose the one dimensional approach to a two dimensional case where the emission of a dipole is shaped into a plane wave by an ENZ device with a design that optimizes the transmittance. As a result, we demonstrate a transmittance efficiency of 15 \% that is 4 orders of magnitude higher than previous devices proposed in the literature for wavefront shaping applications. This work aims at paving the way for future efficient ENZ devices by offering new strategies to optimize the transmittance through ENZ materials.

URL الوصول: http://arxiv.org/abs/1609.04940

المؤلفون: Cluzel, B., Foubert, K., Lalouat, Loic, Picard, E., Peyrade, D., Hadji, E., de Fornel, F.

المصدر: 2011 XXXth URSI General Assembly and Scientific Symposium General Assembly and Scientific Symposium, 2011 XXXth URSI. :1-4 Aug, 2011

Relation: 2011 XXXth URSI General Assembly and Scientific Symposium

المؤلفون: Demichel, O., Petit, M., Viarbitskaya, S., Mejard, R., de Fornel, F., Hertz, E., Billard, F., Bouhelier, A., Cluzel, B.

مصطلحات موضوعية: Physics - Optics

الوصف: We employ nonlinear autocorrelation measurements to investigate plasmon-assisted hot carrier dynamics generated in optical gold antennas. We demonstrate that surface plasmons enable a nonlinear formation of hot carriers, providing thus a unique lever to optimize the energy distribution and generation efficiency of the photo-excited charges. The temporal response of the carriers' relaxation can be controlled within a range extending from 500~fs to 2.5~ps. By conducting a quantitative analysis of the dynamics, we determine the nonlinear absorption cross-section of individual optical antennas. As such, this work provides strong insights on the understanding of plasmon-induced hot carrier generation, especially in the view of applications where the time response plays a preponderant role.

URL الوصول: http://arxiv.org/abs/1601.02779

المؤلفون: Demichel, O., Petit, M., Francs, G. Colas des, Bouhelier, A., Hertz, E., Billard, F., de Fornel, F., Cluzel, B.

المصدر: Optics Express Vol. 22, Issue 12, pp. 15088-15096 (2014)

مصطلحات موضوعية: Physics - Optics

الوصف: Plasmonic dark modes are pure near-field resonances since their dipole moments are vanishing in far field. These modes are particularly interesting to enhance nonlinear light-matter interaction at the nanometer scale because radiative losses are mitigated therefore increasing the intrinsic lifetime of the resonances. However, the excitation of dark modes by standard far field approaches is generally inefficient because the symmetry of the electromagnetic near-field distribution has a poor overlap with the excitation field. Here, we demonstrate the selective optical excitation of bright and dark plasmonic modes of single gold nanorods by spatial phase-shaping the excitation beam. Using two-photon luminescence measurements, we unambiguously identify the symmetry and the order of the emitting modes and analyze their angular distribution by Fourier-space imaging.

URL الوصول: http://arxiv.org/abs/1509.07011

المؤلفون: Dory, J.-B., Castro-Chavarria, C., Jager, J.-B., Bernard, M., Sabbione, C., Tessaire, M., Henaff, E., Coillet, A., Meisterhans, M., Fedeli, J.-M., Cluzel, B., Noe, P.

المصدر: 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC, 2017 Conference on). :1-1 Jun, 2017

Relation: 2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

المؤلفون: Baron, A., Faggiani, R., Zang, X., Lalouat, L., Schulz, S. A., Vynck, K., O'Regan, B., Cluzel, B., de Fornel, F., Krauss, T. F., Lalanne, P.

المصدر: 2015 Conference on Lasers and Electro-Optics (CLEO) Lasers and Electro-Optics (CLEO), 2015 Conference on. :1-2 May, 2015

Relation: 2015 Conference on Lasers and Electro-Optics (CLEO)

المؤلفون: Verbert, J., Salomon, A., Noe, P., Cluzel, B., Velha, P., Calvo, V., Charvolin, T., Picard, E., Hadji, E.

المصدر: IEEE International Conference on Group IV Photonics, 2005. 2nd Group IV Photonics Group IV Photonics, 2005. 2nd IEEE International Conference on. :33-35 2005

Relation: 2005 2nd IEEE International Conference on Group IV Photonics

المؤلفون: Scherrer, G., Hofman, M., Śmigaj, W., Kadic, M., Chang, T. -M., Mélique, X., Lippens, D., Vanbésien, O., Cluzel, B., de Fornel, F., Guenneau, S., Gralak, B.

مصطلحات موضوعية: Physics - Optics

الوصف: Ground-plane cloaks, which transform a curved mirror into a flat one, and recently reported at wavelengths ranging from the optical to the visible spectrum, bring the realm of optical illusion a step closer to reality. However, all carpet-cloaking experiments have thus far been carried out in the far-field. Here, we demonstrate numerically and experimentally that a dielectric photonic crystal (PC) of a complex shape made of a honeycomb array of air holes can scatter waves in the near field like a PC with a at boundary at stop band frequencies. This mirage effect relies upon a specific arrangement of dielectric pillars placed at the nodes of a quasi-conformal grid dressing the PC. Our carpet is shown to work throughout the range of wavelengths 1500nm to 1650nm within the stop band extending from 1280 to 1940 nm. The device has been fabricated using a single- mask advanced nanoelectronics technique on III-V semiconductors and the near field measurements have been carried out in order to image the wave fronts's curvatures around the telecommunication wavelength 1550 nm.
Comment: 6 pages

URL الوصول: http://arxiv.org/abs/1303.5024

المؤلفون: Brissinger, Damien, Cluzel, B., Coillet, A., Dumas, C., Grelu, Ph., de Fornel, F.

المصدر: CLEO/Europe - EQEC 2009 - European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on. :1-1 Jun, 2009

Relation: 2009 Conference on Lasers & Electro-Optics Europe & 11th European Quantum Electronics Conference (CLEO/EQEC)