RIA: Coherent Control of Engineered Semiconductor Heterostructures Using Ultrafast Optical and Electrical Fields

9409297 Reitze提出了一个为期三年的项目，从实验和理论上研究利用相位和振幅，定制，超快（10 ps）光和电场选择性地操纵工程半导体异质结构中的电子态的适用性。精确控制电子和光电器件，包括太赫兹源，太赫兹调制器和电子开关。指导这些系统中电子和空穴分布的演变需要合成适当的场，以便在比特征消相时间更长的时间内与电子波包相干地相互作用。必须解决的关键问题之一是通过声子和其他散射机制的消相限制波包相干性可以保持的时间周期的程度。为了应对这些挑战，提出了一种创新的方法，利用超快成形的光和电波形来操纵非对称耦合量子阱结构中的电子态。最初的努力将首先针对产生和表征定制的电脉冲，通过结合良好的带状线传播技术与飞秒和皮秒脉冲整形。在项目的后期，将应用量子最优控制理论的方法来指导场的设计，以最大限度地减少消相效应的影响，最大限度地提高波包相干性。该研究将确定潜在的物理控制机制，确定耗散可以控制和最小化的程度，并评估将最优控制方法应用于这些系统的可行性。＊＊＊

9409297 Reitze A three year project is proposed to experimentally and theoretically investigate the applicability of using phase and amplitude, tailored, ultrafast(10 ps) optical and electrical fields to selectively manipulate electronic states in engineering semiconductor heterostructures. Precise control of electronic and optoelectronic devices, including terahertz sources, and terahertz speed modulators and electronic switches. Directing the evolution of electron and hole distributions in these systems requires synthesis of the appropriate fields to interact coherently with the electronic wavepacket over time periods longer than characteristic dephasing times. One of the key issues which must be addressed is the extent to which dephasing via phonon and other scattering mechanisms limits the time period in which the wavepacket coherence can be maintained. In order to carry out these challenges, An innovative approach is proposed which uses ultrafast shaped optical and electrical waveforms to manipulate electronic states in an asymmetric coupled quantum well structure. Initial efforts will first be directed at generating and characterizing tailored electrical pulses by combining well established stripline propagation techniques with femtosecond and picosecond pulse shaping. Later in the project, the methods of quantum optimal control theory will be applied to guide the design of fields which minimize the influence of dephasing effects and maximize wavepacket coherence. The proposed research will identify the potential physical controlling mechanisms, determine the extent to which dissipation can be controlled and minimized, and asses the feasibility of applying optimal control methods to these systems. ***