Publications

@article{Matsui:11,

title = {Optical dynamics of energy-transfer from a CdZnO quantum well to a proximal Ag nanostructure},

author = {Hiroaki Matsui and Wataru Nomura and Takashi Yatsui and Motoichi Ohtsu and Hitoshi Tabata},

doi = {10.1364/OL.36.003735},

year  = {2011},

date = {2011-10-01},

journal = {Optics Letters},

volume = {36},

number = {19},

pages = {3735--3737},

publisher = {OSA},

abstract = {We studied photoluminescence (PL) and energy-transfer dynamics in a hybrid structure comprising a Cd0.08Zn0.92O quantum well (QW) and an Ag nanostructure. The observed PL quenching was dependent on the electronic states in the QW. Quenching occurred at low temperature where excited carriers recombined radiatively because of excitonic localization, which disappeared with increasing temperature due to delocalization of excitons. Furthermore, nanostructured Ag surfaces produced local surface plasmon (LSP) absorption that was resonant with the PL peak energy of the QW emission. These results indicate that the recombination energy of excitons transfers nonradiatively to induce LSP excitation, which was revealed using time-resolved PL measurements.},

keywords = {Energy-transfer, Plasmon, QW},

pubstate = {published},

tppubtype = {article}

}

@article{Akahane_2011,

title = {Energy Transfer in Multi-Stacked InAs Quantum Dots},

author = {Kouichi Akahane and Naokatsu Yamamoto and Makoto Naruse and Tadashi Kawazoe and Takashi Yatsui and Motoichi Ohtsu},

doi = {10.1143/jjap.50.04dh05},

year  = {2011},

date = {2011-04-01},

journal = {Japanese Journal of Applied Physics},

volume = {50},

number = {4},

pages = {04DH05},

publisher = {IOP Publishing},

abstract = {We fabricated a modulated stacked quantum dot (QD) structure to investigate energy transfer among QDs using a strain compensation technique that allowed us to fabricate a vertically aligned, highly stacked structure without any degradation in crystal quality. Enhanced photoluminescence (PL) intensity for the ground state of large QDs was clearly observed in a sample where the ground state of small QDs was resonant to the first excited state of large QDs, indicating energy transfer from small QDs to large QDs. Long-range energy transfer reached approximately 200 nm and can be considered from the measurement of N dependence of PL intensity.},

keywords = {Energy-transfer, Nanophotonic device, QD},

pubstate = {published},

tppubtype = {article}

}

@article{2010nomuraAPB,

title = {Structural dependency of optical excitation transfer via optical near-field interactions between semiconductor quantum dots},

author = {Wataru Nomura and Takashi Yatsui and Tadashi Kawazoe and Makoto Naruse and Motoichi Ohtsu},

doi = {10.1007/s00340-010-3977-y},

year  = {2010},

date = {2010-07-01},

journal = {Applied Physics B},

volume = {100},

number = {1},

pages = {181-187},

publisher = {Springer Nature},

abstract = {The distribution dependency of quantum dots was theoretically and experimentally investigated with respect to the basic properties optical excitation transfer via optical near-field interactions between quantum dots. The effects of three-dimensional structure and arraying precision of quantum dots on the signal transfer performance were analyzed. In addition, the quantum dot distribution dependency of the signal transfer performance was experimentally evaluated by using stacked CdSe quantum dots and an optical near-field fiber probe tip laminated with quantum dots serving as an output terminal, showing good agreement with theory. These results demonstrate the basic properties of signal transfer via optical near-field interactions and serve as guidelines for a nanostructure design optimized to attain the desired signal transfer performances.},

keywords = {Energy-transfer, Nanophotonic device, QD},

pubstate = {published},

tppubtype = {article}

}