10:45am - 11:15amInvitedID: 489
/ TOM6 S6: 1
TOM 6 Optical Materials
Invited - Wide-angle transmitting, solar light modulating yttrium and selfcleaning Mie resonators: Yttrium hydride oxide and sulfated titania coated glass nanopillars
Lars Österlund1, Seohan Kim1,2, Felix Wennberg3, José Montero Amenedo1, Anand Srinivasan3, Stefan Karlsson4
1Dept. Materials Science and Engineering, The Ångström Laboratory, Uppsala University; 2Dept. Materials Science and Engineering, Pusan National University, Busan 46241, Korea; 3Dept. Applied Physics, KTH Royal, Institute of Technology School of Engineering Sciences, Albanova University Center, Sweden; 4RISE Research Institutes of Sweden AB, Department of Materials and Surface Design, Glass unit
We present a functional glass coating that embed several functionalities suitable for cover glass
applications in solar energy harvesting applications, including omnidirectional anti-reflection, dynamic solar
control, and self-cleaning. Yttrium hydride oxide (YHO) and sulphated titania (SO4-TiO2) thin films were
deposited on the nanopillar structures using magnetron sputtering methods. Nanopillar terminated glass were
achieved by colloidal lithography templating methods on iron free glass, realizing nanopillar structures with
dimensions /2. The resulting nanopillar structures exploit Mie scattering for wide angle light collection.
The YHO and SO4-TiO2 films block UV light and YHO photo-darkens upon solar light absorption with and
reverts to its transparent state in darkness in reproducible manner with colour neutral spectral characters. The
results demonstrate possibilities to increase e.g. solar cell device efficiency by smart cover glass materials
without adding further control and maintenance solutions.
11:15am - 11:30amID: 205
/ TOM6 S6: 2
TOM 6 Optical Materials
Active modulation of Er3+ emission lifetime by VO2 phase-change thin films
Boris Kalinic, Tiziana Cesca, Carlo Scian, Giovanni Mattei
University of Padova, Italy
The controlled manipulation of optical responses from quantum emitters on the nanoscale is crucial for creating tunable light sources in nanophotonic devices. In this work, we study the coupling of a thin film made of phase-change material (VO2) with a 20 nm-thick silica layer containing Er3+ ions. We demonstrate that the thermally induced semiconductor-to-metal transition of VO2 enables the dynamic tuning of the local density of optical states near erbium emitters. This modulation enables the real-time control of Er3+ emission lifetime at the telecom wavelength (1.54 μm). We achieve a decay rate contrast of factor 2 between high temperature, when VO2 is metallic and room temperature, when VO2 is semiconductor. The experimental findings are in excellent agreement with predictions obtained using the classical dipole oscillator analytical model. A complete hysteresis cycle is measured by varying the sample temperature in the range between room temperature and 100 °C. The hysteresis parameters are consistent with those obtained by GIXRD and transmittance measurements of the VO2 layer as a function of the temperature, confirming the active role provided by the phase-change material. The results make the investigated system an optimal candidate for the development of tunable photon sources at telecom wavelength.
11:30am - 11:45amID: 381
/ TOM6 S6: 3
TOM 6 Optical Materials
Inhomogeneous spectral line broadening and site distribution in “mixed” Er:(Sc,Y)2O3 laser ceramics
Simone Normani1, Pavel Loiko1, Roman Maksimov2,3, Vladislav Shitov3, Vladimir Osipov3, Alain Braud1, Patrice Camy1
1Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), France; 2Ural Federal University named after the first President of Russia B.N. Yeltsin, Ekaterinburg, Russia; 3Institute of Electrophysics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia
Erbium-doped “mixed” yttria-scandia (ScxY1-x)2O3 transparent laser ceramics were fabricated by vacuum sintering at 1750 °C from laser-ablated nanoparticles. Their absorption and mid-infrared emission properties were studied. The addition of Sc3+ induces a strong inhomogeneous spectral line broadening, modifies the crystal field and affects the distribution of Er3+ ions over C2 and C3i symmetry sites. Due to their broadband emission properties, Er:(ScxY1-x)2O3 ceramics are appealing for 2.8-µm lasers.
11:45am - 12:00pmID: 416
/ TOM6 S6: 4
TOM 6 Optical Materials
Femtosecond laser written waveguides in Dy-doped Y3Al5O12 for yellow lasers
Jonathan Demaimay1, Pavel Loiko1, Ambre Gohier1,2, Carolina Romero3, Javier Rodriguez Vázquez de Aldana3, Zhonghuan Zhang4, Xavier Mateos4,6, Xiaodong Xu5, Patrice Camy1, Alain Braud1
1Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252 CEA-CNRS-ENSICAEN, Université de Caen Normandie, 6 Boulevard Maréchal Juin, 14050 Caen, France; 2Institut d’Optique Graduate School, Université Paris Sud, 2 Avenue Augustin Fresnel, 91127 Palaiseau, France; 3Aplicaciones del Láser y Fotónica, University of Salamanca, 37008 Salamanca, Spain; 4Universitat Rovira i Virgili (URV), Física i Cristallografia de Materials (FiCMA), Marcel·lí Domingo 1, 43007 Tarragona, Spain; 5Jiangsu Key Laboratory of Advanced Laser Materials and Devices, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, China; 6Serra Húnter Fellow, Spain
Depressed cladding waveguides in a Dy:YAG crystal were fabricated by femtosecond direct laser writing. Their μ-luminescence characterization in the visible revealed well-preserved emission properties in the core region, a strong material modification within the damage tracks, and an anisotropic stress field associated with ear-like side structures. The developed waveguides are promising for yellow lasers.
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