多量子阱光开关器件的激子吸收及光调制特性

分析了GaAs/AlGaAs半导体多量子阱光开关器件的室温激子吸收行为及光调制特性，优化设计了多量子阱结构，研制出常通型和常关型两种类型光开关器件，并对器件的光调制特性进行了测量与研究。实验得出的结构与理论计算相符合。

微光电子集成灵巧象素器件

采用MBE生长出大周期GaAs/AlGaAs多量子阱外延材料，研制了适用于倒装焊结构的自电光效应器件列阵，并与Si CMOS电路通过倒装焊工艺集成为微光电子集成灵巧象素器件。通过对光电特性测试表明，器件具有良好的光探测和光调制性能。

多量子阱自电光效应器件及其负阻特性

研究了GaAs/AlGaAs多量子阱结构的电场光调制特性,测量了光反射谱、光电流谱和光电流电压特性。结果表明,在I-V特性中存在光电流负微分电阻区。由这种多量子阱材料制备的自电效应器件(SEED)观察到明显的量子限制Stark效应。

多量子阱空间光调制器二维列阵

用MBE技术生长GaAs/AlGaAs多量子阱材料,研制出8×8独立寻址反射型空间光调制器列阵,对列阵的光反射谱、光电流谱、电场调制特性及电学特性进行了全面的测试，并对列阵的均匀性进行了分析。

异质结电荷注入晶体管

通过对GaAs/AlGaAs异质结电荷注入晶体管结构和工艺的探索研究,以及对器件工作特性的测量分析,在理论上给出了器件过程的物理机制,并对器件结果提出了进一步的改进措施。

掺铒光纤放大器泵浦源用980nm量子阱激光器

利用分子束外延(MBE)方法研制出了高质量的InGaAs/GaAs/AlGaAs应变量子阱激光器外延材料,其最低的阈值电流密度可达到140/cm~2,激发波长在980nm左右.通过脊型波导结构的制备,获得了高性能的适合于掺铒光纤放大器用的980nm量子阱激光器泵浦源,其典型的阈值电流和外微分量子效率分别为15mA和0.8mW/mA,基横模的输出功率大于80mW,器件在50℃,80mW的恒功率老化实验表明,器件具有较好的可靠性.通过与掺铒光纤的耦合,其组合件出纤功率可达60mW以上.

窄发散角量子阱激光器的结构设计与分析

对GaAs/AlGaAs量子阱结构激光器中重要的结构参数与远场垂直发散角的关系作了系统的理论计算与分析,提出了实现20°~30°垂直发散角的有效途径,并同时研究了对激光器的光功率限制因子、阈值电流密度等重要参数的影响.

MOCVD生长大功率单量子阱激光器

介绍了MOCVD生长的高质量GaAs和AlAs材料以及(Al)GaAs/AlGaAs分别限制单量子阱激光器.GaAs材料的77K迁移率为122.700cm~2/(V·s),GaAs/AlAs具有均匀陡变的界面.激光器的最大光输出功率为4W,平均光功率密度达4MW/cm~2,斜率效率为1.2W/A,在1W恒功老化4000小时电流增加小于10%,预计寿命可超过两万小时.

量子阱激光器光增益温度关系及对激射特性的影响

计算了不同温度下GaAs/AlGaAs量子阱材料光增益与载流子密度的关系。根据B-D条件:ΔF＞hγ≥E_g+E_(c1)+E_(v1),得到了ΔF、峰值增益光子能量和E_g+E_(v1)与载流子密度的关系,并得到了不同增益的激光器阈值电流温度关系。计算结果解释了实验出现的阈值电流温度的反常特性和波长开关现象,并且与器件温度特性符合。

量子阱光反射光谱的电调制机理

研究了量子阱材料光反射光谱的电调制机理, 根据斯塔克效应, 对量子阱中非激子的带间跃迁和激子跃迁两种情况, 分析了电场引起的介电函数的改变和相应的光反射调制光谱线形, 对GaAs／AlGaAs量子阱所得光反射光谱的实验结果与理论分析基本符合。图4参8

Multiple quantum well self electro-optic effect devices for optoelectronic smart pixels

The investigations on GaAs/AlGaAs multiple quantum well self electro-optic effect device (SEED) arrays for optoelectronic smart pixels are reported. The hybrid integration of GaAs/AlGaAs multiple quantum well devices flip-chip bonding directly over 1 mu m silicon CMOS circuits are demonstrated. The GaAs/AlGaAs multiple quantum well devices are designed for 850nm operation. The measurement results under applied biases show the good optoelectronic characteristics of elements in SEED arrays. The 4x4 optoelectronic crossbar structure consisting of hybrid CMOS-SEED smart pixels have been designed, which could be potentially used in optical interconnects for multiple processors.

Flip-chip bonded hybrid CMOS/SEED optoelectronic smart pixels

Hybrid integration of GaAs/AlGaAs multiple quantum well self electro-optic effect device (SEED) arrays are demonstrated flip-chip bonded directly onto 1 mu m silicon CMOS circuits. The GaAs/AlGaAs MQW devices are designed for 850 nm operation. Some devices are used as input light detectors and others serve as output light modulators. The measurement results under applied biases show good optoelectronic characteristics of elements in SEED arrays. Nearly the same reflection spectrum is obtained for the different devices at an array and the contrast ratio is more than 1.2:1 after flip-chip bonding and packaging. The transimpedance receiver-transmitter circuit can be operated at a frequency of 300 MHz.

AlGaAs/GaAs,InGaAs/GaAs体系光电子材料的MBE生长及相关性质研究

Submitted by zhangdi (zhangdi@red.semi.ac.cn) on 2009-04-13T11:45:31Z

Quasi-continuous-wave operation of AlGaAs/GaAs quantum cascade lasers

Quasi-continuous-wave operation of AlGaAs/GaAs-based quantum cascade lasers (lambda similar to 9 mu m) up to 165 K is reported. The strong temperature dependence of the threshold current density and its higher value in high duty cycle is investigated in detail. The self-heating effect in the active region is explored by changing the operating duty cycles. The degradation of lasing performance with temperature is explained. (c) 2005 Elsevier B.V. All rights reserved.