Lasing mechanisms in high-quality T-shaped quantum-wire lasers

高质量 T 形量子线激光器中的激光机制

• 批准号: 14350159
• 负责人: AKIYAMA Hidefumi
• 金额: $ 10.69万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350159/
• 关键词: quantum wire; quantum wire laser; one-demensional exciton; MBE; cleaved-edge overgrowth; growth-interrupt anneal; PL; electron-hole plasma

T-shaped quantum wire laser structures containing 20 wires of 14nmx6nm size each with atomically flat interfaces have been fabricated by cleaved edge overgrowth with growth interrupt annealing in MBE. We studied these laser structures by PL scanning measurements with our home made motor scanning system, excitation power dependent PL measurements, lasing measurements with optical excitations, gain measurements by Shaklee method and Hakki-Paoli method. We made similar measurements for a single wire laser structures containing only one quantum wire with the same cross-sectional size. We also performed detailed PL scanning measurements for an n-type modulation-doped single quantum wire structure with a gate to tune one-dimensional electron gas density like a FET.Thanks to the PL scanning measurements we were able to select high-quality quantum wire regions with PL width of 1-1.5meV from regions with larger PL width or with localized states. From PLE measurement results, reliable assignments to one-dimensional free excitons and continuum states have been done on the basis of comparison with rigorous theoretical calculations including the Coulomb interactions. Line shape of continuum state was measured for the first time.Finally, excitation power dependent PL measurements have demonstrated formation of biexcitons and electron-hole plasmas in the wires. Comparison with the lasing data have shown that the origins of gain in lasing are not free excitons that were claimed before, but are strongly-Coulomb correlated electron-hole plasmas.

利用MBE中生长中断退火的劈裂边过生长方法，制备了20根14nmx6nm尺寸的原子平界面t型量子线激光结构。我们利用自制的电机扫描系统对这些激光结构进行了PL扫描测量、激发功率相关的PL测量、光激发的激光测量、Shaklee法和Hakki-Paoli法的增益测量。我们对仅包含一个具有相同横截面尺寸的量子线的单线激光结构进行了类似的测量。我们还对一个n型调制掺杂的单量子线结构进行了详细的PL扫描测量，该结构具有一个门，可以像场效应管一样调节一维电子气体密度。由于PL扫描测量，我们能够从PL宽度较大或局域态的区域中选择PL宽度为1-1.5meV的高质量量子线区域。从PLE测量结果来看，在与包括库仑相互作用在内的严格理论计算比较的基础上，对一维自由激子和连续态进行了可靠的赋值。首次测量了连续态的线形。最后，激发功率相关的PL测量已经证明了线中双激子和电子空穴等离子体的形成。与激光数据的比较表明，激光增益的来源不是以前所宣称的自由激子，而是强库仑相关电子-空穴等离子体。

项目成果

Optical gain spectra due to a one-dimensional electron-hole plasma in a quantum wire laser

量子线激光器中一维电子空穴等离子体产生的光学增益光谱

• 发表时间: 2005
• 期刊: Proc.of 27th Int.Conf.on Physics of Semiconductors 27(in press)
• 作者: Y.Hayamizu;M.Yoshita;H.Itoh;H.Akiyama;L.N.Pfeiffer;K.W.West
• 通讯作者: K.W.West

Masahiro Yoshita, et al.: "Improved high collection efficiency in fluorescence microscopy with a Weierstrass-sphere solid immersion lens"Jpn.J.Appl.Phys., Part 2. 41. L858-L860 (2002)

Masahiro Yoshita 等人：“使用 Weierstrass 球固体浸没透镜提高了荧光显微镜的高收集效率”Jpn.J.Appl.Phys.，第 2.41 部分。L858-L860 (2002)

Control of MBE surface step-edge kinetics to make an atomically smooth quantum well

控制 MBE 表面阶跃边缘动力学以制造原子级光滑的量子阱

• 发表时间: 2003
• 期刊: J.Cryst.Growth. 251
• 作者: M.Yoshita;J.W.Oh;H.Akiyama;L.N.Pfeiffer;K.W.West
• 通讯作者: K.W.West

秋山 英文 他: "高品質T型量子細線レーザーの一次元電子状態とレーザー発振起源"固体物理. 37(10). 771-778 (2002)

Hidefumi Akiyama 等人：“高质量 T 型量子线激光器的一维电子态和激光起源”37(10) 771-778 (2002)。

Lasing from a single-quantum wire

• DOI: 10.1063/1.1532111
• 发表时间: 2002-09
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: Y. Hayamizu;M. Yoshita;S. Watanabe;H. Akiyama;L. Pfeiffer;K. West