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Ph.D. Dissertation Defense: Tao Cai
Tuesday, July 18, 2017
10:00 a.m.
For More Information:
Maria Hoo
301 405 3681

ANNOUNCEMENT: Ph.D. Dissertation Defense
Name: Tao Cai
Committee members:
Professor Edo Waks, Chair
Professor Thomas E. Murphy
Professor Mohammad Hafezi
Professor Jeremy Munday
Professor Luis Orozco
Professor Jacob Taylor
Date/Time: Tuesday July 18, 2017 at 10:00 am
Place: ERF1207, Large conference room, Institute of Research in electronics and Applied physics
Title: Controlled interaction between single photon emitters and photonic nano-structures

Coupling single photon emitters to photonic nano-structures provides a way to accomplish efficient and controllable light-matter interaction. Such coupled systems lead to various applications such as quantum information science, quantum communication and quantum measurement, where the interaction between emitters and light is at the core. This dissertation studies controlled interaction between single photon emitters and photonic nano-structures.
The first part of the dissertation focuses in a quantum dot strongly coupled to a photonic crystal cavity. Such a strongly coupled system enables optical nonlinearity near the single photon level, which plays an important part in quantum light-matter interaction. Controlling the vacuum Rabi oscillations of the system is challenging and has never been achieved at optical frequency on a solid-state platform. Here we demonstrate coherent control of energy transfer between a quantum dot and a cavity by manipulating the system’s vacuum Rabi oscillations. Such a technique could ultimately provide a path towards GHz controlled synthesis of non-classical light at optical frequencies on a solid-state platform.
In the first part of the dissertation a photonic molecule consisting coupled cavities plays an important role. Such photonic molecules could also enable many other quantum optics applications, as well as sensors and lasers. One remaining issue of the photonic molecules is the nano-fabrication induced errors that could decouple the cavities. The second part of the dissertation presents a technique to control the coupling between photonic crystal cavities using a photochromic thin film. Such technique is versatile and could be applied to other resonating architectures as well as cavity arrays consisting larger number of cavities. 
The last part of the dissertation explores coupling single-defect emitters in 2D semiconductors to plasmonic structures. Surface plasmon polaritons concentrate light into sub-wavelength dimensions. Coupling single photon emitters to such strongly confined field allows efficient emitter-light interaction, which is promising for achieving super-compact quantum photonic circuit. We engineer the strains on atomically thin tungsten diselenide (WSe2) and generate single-defect emitters self-aligned to the plasmonic mode of a silver nanowire. This technique offers a way to achieve efficient coupling between diverse plasmonic nano-structures and localized defects in 2D semiconductors.

This Event is For: Graduate • Faculty

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