Nanostructured amorphous gallium phosphide on silica for nonlinear and ultrafast nanophotonics

Tilmann，Benjamin1; Grinblat，Gustavo2; Berté，Rodrigo1; Özcan，Mehmet3; Kunzelmann，Viktoria F.4; Nickel，Bert3; Sharp，Ian D.4; Cortés，Emiliano1; Maier，Stefan A.1,5; Li，Yi1,6

2020-11-01

10.1039/d0nh00461h

Nanoscale Horizons   影响因子和分区

2055-6756

2055-6764

Nanophotonics based on high refractive index dielectrics relies on appreciable contrast between the indices of designed nanostructures and their immediate surrounding, which can be achieved by the growth of thin films on low-index substrates. Here we propose the use of high index amorphous gallium phosphide (a-GaP), fabricated by radio-frequency sputter deposition, on top of a low refractive index glass substrate and thoroughly examine its nanophotonic properties. Spectral ellipsometry of the amorphous material demonstrates the optical properties to be considerably close to crystalline gallium phosphide (c-GaP), with low-loss transparency for wavelengths longer than 650 nm. When nanostructured into nanopatches, the second harmonic (SH) response of an individual a-GaP patch is characterized to be more than two orders of magnitude larger than the as-deposited unstructured film, with an anapole-like resonant behavior. Numerical simulations are in good agreement with the experimental results over a large spectral and geometrical range. Furthermore, by studying individual a-GaP nanopatches through non-degenerate pump-probe spectroscopy with sub-10 fs pulses, we find a more than 5% ultrafast modulation of the reflectivity that is accompanied by a slower decaying free carrier contribution, caused by absorption. Our investigations reveal a potential for a-GaP as an adequate inexpensive and CMOS-compatible material for nonlinear nanophotonic applications as well as for photocatalysis.

SCI ; EI

英语

其他

Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy[EXC 2089/1-390776260] ; EPSRC Reactive Plasmonics Programme[EP/M013812/1] ; ERC[802989] ; PICT grant[2017-2534] ; Natural Science Foundation of Guandong Province[2019A1515111136] ; European Union's Framework Programme for Research and Innovation Horizon 2020 (2014-2020) under the Marie Skodowska-Curie Grant[754388]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000582397500005

ROYAL SOC CHEMISTRY

20204509445817

Nanostructures ; III-V semiconductors ; Nanophotonics ; Refractive index ; Gallium phosphide ; Glass substrates ; Amorphous materials ; Optical pumping

Semiconducting Materials:712.1 ; Light/Optics:741.1 ; Nanotechnology:761 ; Inorganic Compounds:804.2 ; Coating Materials:813.2 ; Solid State Physics:933 ; Amorphous Solids:933.2

2-s2.0-85094684228

Scopus

1.Chair in Hybrid Nanosystems,Nanoinstitut München,Fakultät für Physik,Ludwig-Maximilians-Universität München,München,80539,Germany
2.Departamento de Física,FCEN,IFIBA-CONICET,Universidad de Buenos Aires,Buenos Aires,C1428EGA,Argentina
3.Fakultät für Physik and Center for NanoScience (CeNS),Ludwig-Maximilians-Universität,München,80539,Germany
4.Walter Schottky Institut and Physics Department,Technische Universität München,Garching,Am Coulombwall 4,85748,Germany
5.Blackett Laboratory,Department of Physics,Imperial College London,London,SW7 2AZ,United Kingdom
6.School of Microelectronics,Moe Engineering Research Center of Integrated Circuits for Next Generation Communications,Southern University of Science and Technology,Shenzhen,518055,China

Tilmann，Benjamin,Grinblat，Gustavo,Berté，Rodrigo,et al. Nanostructured amorphous gallium phosphide on silica for nonlinear and ultrafast nanophotonics[J]. Nanoscale Horizons,2020,5(11):1500-1508.

Tilmann，Benjamin.,Grinblat，Gustavo.,Berté，Rodrigo.,Özcan，Mehmet.,Kunzelmann，Viktoria F..,...&Li，Yi.(2020).Nanostructured amorphous gallium phosphide on silica for nonlinear and ultrafast nanophotonics.Nanoscale Horizons,5(11),1500-1508.

Tilmann，Benjamin,et al."Nanostructured amorphous gallium phosphide on silica for nonlinear and ultrafast nanophotonics".Nanoscale Horizons 5.11(2020):1500-1508.