News Column

New Findings from Waseda University Describe Advances in Science

June 13, 2014

By a News Reporter-Staff News Editor at Science Letter -- Current study results on Science have been published. According to news reporting originating from Tokyo, Japan, by NewsRx correspondents, research stated, "Single-photon sources are important elements in quantum optics and quantum information science. It is crucial that such sources be able to couple photons emitted from a single quantum emitter to a single propagating mode, preferably to the guided mode of a single-mode optical fiber, with high efficiency."

Our news editors obtained a quote from the research from Waseda University, "Various photonic devices have been successfully demonstrated to efficiently couple photons from an emitter to a single mode of a cavity or a waveguide. However, efficient coupling of these devices to optical fibers is sometimes challenging. Here we show that up to 38% of photons from an emitter can be directly coupled to a single-mode optical fiber by utilizing the flat tip of a silica nanofiber. With the aid of a metallic mirror, the efficiency can be increased to 76%. The use of a silicon waveguide further increases the efficiency to 87%."

According to the news editors, the research concluded: "This simple device can be applied to various quantum emitters."

For more information on this research see: Efficient single-mode photon-coupling device utilizing a nanofiber tip. Scientific Reports, 2014;4():4785. (Nature Publishing Group -; Scientific Reports -

The news editors report that additional information may be obtained by contacting S. Chonan, Dept. of Applied Physics, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo, Japan. Additional authors for this research include S. Kato and T. Aoki (see also Science).

Keywords for this news article include: Asia, Tokyo, Japan, Science.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC

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Source: Science Letter

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