Kenichi Ohno

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We demonstrate fully three-dimensional and patterned localization of nitrogen-vacancy (NV) centers in diamond with coherence times in excess of 1 ms. Nitrogen δ-doping during chemical vapor deposition diamond growth vertically confines nitrogen to 4 nm while electron irradiation with a transmission electron microscope laterally confines vacancies to less(More)
Optical cavities create regions of high field intensity, which can be used for selective spectral enhancement of emitters such as the nitrogen vacancy center (NV) in diamond. This report discusses a hybrid metal−diamond photonic crystal cavity, which provides greater localization of the electric field than dielectric cavities and mitigates metalrelated(More)
The nitrogen-vacancy (NV) center in diamond is an attractive platform for quantum information and sensing applications because of its room temperature operation and optical addressability. A major research effort focuses on improving the quantum coherence of this defect in engineered micro- and nanoscale diamond particles (DPs), which could prove useful for(More)
Understanding plasma etch damage on near-surface nitrogen vacancy (NV) centers in diamond is essential for preserving NV emission in photonic structures and magnetometry systems. We have developed a methodology to compare the optical properties of ensemble NV centers initially 70 nm from the surface brought closer to the surface through etching with O2(More)
We examine how households protected their livelihood against an unexpected negative shock caused by the highly pathogenic avian influenza (HPAI). We also compare HPAI with other shocks such as sickness, ceremonial events, typhoons, floods, droughts, and unemployment. We apply the augmented testing framework of the canonical consumption risk-sharing(More)
Foreword This book is a collection of essays on ownership, based on case analyses of three East Asian countries. By illustrating the different nature and levels of ownership demonstrated in Thailand, Vietnam, and Cambodia, it attempts to cast light on critical elements of ownership that are desirable for and should be ultimately aspired by today's(More)
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