期刊
NATURE PHOTONICS
卷 10, 期 10, 页码 647-652出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2016.184
关键词
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资金
- Basic Science Research Program through National Research Foundation of Korea (NRF) - Ministry of Education [2013R1A1A2065357]
- NRF - Ministry of Education [2013R1A1A4A03008577]
- Nano Material Technology Development Program [2015036205]
- World Class Institute Program [WCI 2011-001]
- Ministry of Science, ICT and Future Planning [2014M3C1A3052537, 2012R1A2A1A03670391, 2015001948]
- Center for Advanced Meta-Materials - Ministry of Science, ICT and Future Planning as Global Frontier Project [CAMM-2014M3A6B3063709]
- [IBS-R024-D1]
- National Research Foundation of Korea [2013R1A1A4A03008577, 2012R1A2A1A03670391, 2013R1A1A2065357] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In dielectric cavities with a rotational symmetry, whispering gallery modes (WGMs) with an extremely long lifetime (that is, a very high Q factor) can be formed by total internal reflection of light around the rim of the cavities. The ultrahigh Q factor of WGMs has enabled a variety of impressive photonic systems, such as ultralow threshold microlasers(1-3), biosensors with unprecedented sensitivity(4,5) and cavity optomechanical devices(6). However, the isotropic emission of WGMs, which is due to the rotational symmetry, is a serious drawback in applications that require directional light sources. Considerable efforts have thus been devoted to achieving directional emission by intentionally breaking the rotational symmetry(7-9). However, all of the methods proposed so far have suffered from substantial Q-spoiling. Here, we show how the mode properties of dielectric whispering gallery cavities, such as the Q factor and emission directionality, can be tailored at will using transformation optics. The proposed scheme will open a new horizon of applications beyond the conventional WGMs.
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