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Synthesis and Nano-Processing of ZnO Nano-Crystals for Controlled Laser Action

机译：用于控制激光作用的ZnO纳米晶体的合成与纳米加工

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摘要

Lasing characteristics of a single Zinc oxide (ZnO) nanosheet and a single ZnO nanowire were investigated by an ultraviolet light excitation. ZnO nanocrystals were synthesized by chemical vapor deposition (CVD) method, and those ZnO nanocrystals were excited by a third-harmonic Q-switched Nd:YAG laser beam (355 nm, 5 ns). The emission spectra from a single ZnO nanocrystal was collected by an objective lens with a magnification factor of 100 or 50, coupled with a spectrometer with a light fiber. The area observed by the spectrometer is about 10 urn in diameter, and therefore the emission spectra from a single ZnO nanocrystal can be observed. The emission spectra showed the obvious lasing characteristics having mode structure and a threshold for lasing. The lasing threshold power density of a ZnO nanosheet and a ZnO nanowire were measured to be about 60 kW/cm~2 and 150 kW/cm~2, respectively. ZnO nanosheet can be a superior laser medium due to the lower threshold for lasing compared to the threshold of the ZnO nanowire. However, since the lasing spectra had mode structure, a single-longitudinal mode lasing would be required for a practical application. The single longitudinal mode lasing can be realized by a nanomachining of a grating on the ZnO nanocrystal surface due to distributed bragg reflector (DBR) laser. The minimum DBR pitch was estimated to be about 81 nm, which can be machined by focused-ion beam (FIB) focused up to 7 nm at minimum, and therefore, we demonstrated the nanomachining on a single ZnO nanowire. However, the single-longitudinal mode lasing was not observed so far, and thus optimization of experimental conditions such as the DBR pitch, ion dose amount and increasing the number of repetition of DBR would be required.
机译：通过紫外光激发研究了单个氧化锌（ZnO）纳米片和单个ZnO纳米线的激光发射特性。通过化学气相沉积（CVD）法合成了ZnO纳米晶体，并通过三次谐波调Q的Nd：YAG激光束（355 nm，5 ns）激发了这些ZnO纳米晶体。单个ZnO纳米晶体的发射光谱是通过物镜收集的，其放大倍数为100或50，并与带有光纤的光谱仪耦合。通过分光计观察到的区域的直径约为10微米，因此可以观察到单个ZnO纳米晶体的发射光谱。发射光谱显示出明显的激光特征，具有模式结构和激光阈值。测得的ZnO纳米片和ZnO纳米线的激光阈值功率密度分别约为60 kW / cm〜2和150 kW / cm〜2。由于与ZnO纳米线的阈值相比，激光发射的阈值较低，因此ZnO纳米片可以是一种优良的激光介质。但是，由于激光光谱具有模式结构，因此在实际应用中将需要单纵模激光。可以通过分布式布拉格反射器（DBR）激光在ZnO纳米晶体表面上对光栅进行纳米加工来实现单纵模激射。最小DBR间距估计约为81 nm，可以通过聚焦离子束（FIB）至少聚焦至7 nm来加工，因此，我们证明了在单个ZnO纳米线上的纳米加工。然而，到目前为止还没有观察到单纵模激射，因此需要优化实验条件，例如DBR间距，离子剂量和增加DBR的重复次数。

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  • 会议地点 San Francisco CA(US);San Francisco CA(US);San Francisco CA(US)
  • 作者

    K. Okazaki; T. Shimogaki; M. Higashihata; D. Nakamura; T. Okada;

  • 作者单位

    Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;

    Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;

    Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;

    Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;

    Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;

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