期刊
OPTICS EXPRESS
卷 27, 期 8, 页码 10472-10481出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.27.010472
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资金
- National Natural Science Foundation of China [61805112]
- Natural Science Foundation of Jiangsu Province [BK20181003]
- Special Project of National Key Technology R&D Program of the Ministry of Science and Technology of China [2016YFC0201401]
We present an optical-trapping scheme based on an on-resonance photonic nanojet (PNJ) excited using a plane wave. A two-dimensional numerical simulation demonstrates that a PNJ is enhanced through resonance with whispering gallery modes (WGMs) and achieves a larger spatial distribution, providing a stable trapping region for nanoparticles nearly four times larger than those of the WGM nodes without broadening by the PNJ. To further enlarge the trapping region, an asymmetric micro-resonator lengthens the mode field of the on-resonance PNJ. We also propose an effective method for addressing the nanoparticle-induced resonance detuning through exciting high-order WGMs of a larger-mode field volume. (c) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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