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arXiv · 1610.03584

Nondestructive on-chip detection of optical orbital angular momentum through a single plasmonic nanohole

Dunzhao Wei·Yongmei Wang·Dongmei Liu·Yunzhi Zhu·Weihao Zhong·Xinyuan Fang·Yong Zhang·Min Xiao
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Abstract

Optical orbital angular momentum (OAM) provides an additional dimension for photons to carry information in high-capacity optical communication. Although the practical needs have intrigued the generations of miniaturized devices to manipulate the OAM modes in various integrated platforms, the on-chip OAM detection is still challenging to match the newly-developed compact OAM emitter and OAM transmission fiber. Here, we demonstrate an ultra-compact device, i.e., a single plasmonic nanohole, to efficiently measure an optical beam's OAM state in a nondestructive way. The device size is reduced down to a few hundreds of nanometers, which can be easily fabricated and installed in the current OAM devices. It is a flexible and robust way for in-situ OAM monitoring and detection in optical fiber networks and long-distance optical communication systems. With proper optimization of the nanohole parameters, this approach could be further extended to discriminate the OAM information multiplexed in multiple wavelengths and polarizations.

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Dunzhao Wei, Yongmei Wang, Dongmei Liu, Yunzhi Zhu, Weihao Zhong, Xinyuan Fang, Yong Zhang, Min Xiao. 2016-10-12. Nondestructive on-chip detection of optical orbital angular momentum through a single plasmonic nanohole. https://arxiv.org/abs/1610.03584

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