“Thinking Inside the Box: Quantum Dots
Tuned to Photonic Crystal Cavities”
Dr. Evelyn Hu
Carefully crafted ‘nanoboxes’ can form exquisitely tuned cavities or resonators for optical emitters (atoms, molecules, quantum dots) that are situated within. The distinctive match of unique photon states in the nanocavity to discrete electronic states in the emitter, concentrated within spatial volumes on the order of a cubic wavelength can result in extremely strong light-matter interactions. Efficient, well-matched energy transfer between nanobox and emitter can produce ultra-low threshold lasers and other light sources. These systems can also serve as testbeds for quantum information processing in the solid state. This talk will describe recent results achieved for MBE-grown InAs quantum dots embedded within ‘nanoboxes’ fabricated from GaAs photonic crystal material. ‘Active positioning’ of the quantum dots within the nanoboxes, and sensitive tuning techniques of the nanocavities have resulted in the strong coupling of a single quantum dot to the nanocavity. Thinking and working ‘inside the box’ has produced a range of fascinating insights, but also revealed new puzzles about quantum dot-cavity interactions in semiconductors.
Bio: Evelyn Hu joined UCSB in 1984 and is currently serving as director of the California NanoSystems Institute. She has served as Vice Chair (1989-92), and subsequently Chair (1992-94) of the ECE Department. In addition, she has directed two large research centers: QUEST, an NSF Science and Technology Center for Quantized Electronic Structures, and Nanotech, part of the original National Nanofabrication Users Network (NNUN). She received her B.A. in Physics from Barnard College and her M.A. and Ph.D. in Physics from Columbia University. From 1975-81, Dr. Hu worked at AT&T Bell Laboratories, developing microfabrication and nanofabrication techniques for high performance superconducting and semiconducting devices and circuits. In 1984 she joined UCSB as a Professor of Electrical and Computer Engineering (ECE). She currently holds joint appointments in ECE and Materials. Her research focuses on high-resolution fabrication of compound semiconductor electronic and optoelectronic devices, candidate structures for the realization of quantum computation schemes, and on novel device structures formed through the heterogeneous integration of materials. Recently her work has involved the interaction of quantum dots in high Q microdisk and photonic crystal cavities. She is a member of the National Academy of Engineering, the Academica Sinica of Taiwan, a recipient of an NSF Distinguished Teaching Fellow award, an AAAS Lifetime Mentor Award, a Fellow of the IEEE, APS, and the AAAS,and holds an honorary Doctorate of Engineering from the University of Glasgow. She was selected UCSB Faculty Research Lecturer in 2005.