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International Conference on Information Photonics

Optical pulsation based on near-field interactions at the nanoscale by continuous-wave light excitation

Makoto Naruse, Hirokazu Hori, Kiyoshi Kobayashi, Tadashi Kawazoe, Motoichi Ohtsu

Published May 1, 2011• 0 citations
Publisher

Abstract

We theoretically demonstrate optical pulsation based on optical near-field interactions at the nanoscale. We observe pulsation in populations pumped by continuous-wave light excitation based on optical energy transfer from smaller to larger quantum dots. This will provide critical insights toward the design and implementation of experimental nanophotonic pulse generating devices.

DOI
10.1109/ico-ip.2011.5953768

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We theoretically demonstrate optical pulsation based on optical near-field interactions at the nanoscale. We observe pulsation in populations pumped by continuous-wave light excitation based on optical energy transfer from smaller to larger quantum dots. This will provide critical insights toward the design and implementation of experimental nanophotonic pulse generating devices.
Energy transfer and exciton population dynamics in a two-quantum dot system coupled with a phonon heat-bath system are examined using the density matrix formalism. In such a system, optical near-field interactions induce energy transfer between quantum dots, and exciton–phonon interactions guarantee the unidirectional excitation energy transfer. Our theoretical investigation shows that the population dynamics change drastically depending on the coupling strengths due to optical near-field interactions and exciton–phonon heat-bath interactions. The temperature effect promotes frequent energy back-transfer from the heat-bath to the quantum dot system. Applying our theoretical formulation, we numerically calculate the time evolution of populations, and estimate energy transfer time or state-filling time for a CuCl quantum dot system. The estimated time is suitable for the elements in our proposed optical nano-switch and nano-photonic devices.
In nanophotonic device operations, characteristic features on a nanometer scale, such as locally excited states, dependence on the excitation number, and spatial symmetry of a system, play an important role. Using these features, selective excitation energy transfer via an optical near field is shown for a quantum-dot system with discrete energy levels. This selectivity strongly depends on a dipole-inactive state of an exciton, which cannot be excited by the far-field light. Operation principles of logic gates, photon storage, and quantum information processing device, which are based on the selectivity, are proposed, and the temporal dynamics are investigated analytically and numerically by using quantum theory. Nanophotonic devices, which are constructed from quantum mechanical and classical dissipative systems, are expected to become one of a key technologies in future device architecture.