Fabrication of photonic crystals in rare-earth doped chalcogenide glass films for enhanced upconversion

Fabrication of photonic crystals in rare-earth doped chalcogenide glass films for enhanced upconversion
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在稀土掺杂硫族化物玻璃薄膜中制造光子晶体以增强上转换

DOI:
10.1117/12.908014
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发表时间:
2012
期刊:
--
影响因子:
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通讯作者:
Pollard M
Pollard M
中科院分区:
--
文献类型:
--
作者:
Pollard M

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氧化硫化镧镓(GLSO)是一种很有前途的主体材料,用于观察三价稀土离子如铒(Er3+)的强上转换发射。由于玻璃前体中镧的含量,它具有较高的稀土溶解度,具有较高的折射率(550nm处n= 2.2),具有较高的辐射效率,最大声子能量较低,约为425cm-1。同时,光子晶体可以提供可控的光提取,并且可能能够抑制来自较低亚稳态的不需要的红外发射。本文描述了用射频溅射法在掺Er3+的GLSO退火薄膜中制备光子晶体。在550℃退火的薄膜中观察到最强烈的可见上转换发射,接近体玻璃化转变温度。随后使用聚焦离子束(FIB)将六方晶格光子晶体磨成薄膜。铣削参数进行了优化,以产生最垂直的侧壁轮廓。
Gallium lanthanum oxysulfide (GLSO) is a promising host material for observing strong upconversion emission from trivalent rare-earth ions such as erbium (Er3+). Its attractive properties include high rare-earth solubility due to the lanthanum content of the glass former, a high refractive index (n= 2.2 at 550nm) for high radiative efficiency, and a low maximum phonon energy of approximately 425cm-1. Photonic crystals meanwhile can provide controlled light extraction, and may be capable of suppressing unwanted IR emission from lower lying metastable states. Here, we describe the fabrication of photonic crystals in annealed films of Er3+-doped GLSO deposited by RF sputtering. The most intense visible upconversion emission is observed in films annealed at 550°C, close to the bulk glass transition temperature. Hexagonal lattice photonic crystals are subsequently milled into the films using a focused ion beam (FIB). The milling parameters are optimized to produce the most vertical sidewall profile.
稀土掺杂硫化镓镧基玻璃中的可见光上转换
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