Gallium Phosphide Nanoparticles for Low‐Loss Nanoantennas in Visible Range
Gallium Phosphide Nanoparticles for Low‐Loss Nanoantennas in Visible Range
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用于可见光范围低损耗纳米天线的磷化镓纳米颗粒
DOI:
10.1002/adom.202203107
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发表时间:
2023
影响因子:
9
通讯作者:
Fujii Minoru
中科院分区:
文献类型:
--
作者:
Shima Daisuke;Sugimoto Hiroshi;Assadillayev Artyom;Raza S?ren;Fujii Minoru
Colloidal nanoparticles of gallium phosphide (GaP) with moderately high refractive index (n> 3) and a small extinction coefficient in the visible range are developed using a combination of mechanical milling and a pulsed laser melting process in solution. The combined process yields GaP nanoparticles with an almost spherical shape and the smooth surface. The single particle scattering spectroscopy reveals that smoothening of the surface by the pulsed laser melting process is crucial for achieving distinctive Mie resonances of the dipolar and higher‐order modes in the visible range. The near‐field profile at the Mie resonances studied by electron energy loss spectroscopy in a scanning transmission electron microscope confirms the existence of the magnetic dipole mode. Finally, the Purcell enhancement of fluorescence of molecules on the surface due to the Mie resonances is demonstrated.
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