期刊
SCIENTIFIC REPORTS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41598-017-05781-4
关键词
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资金
- National Basic Research Program of China [2015CB352005]
- National Natural Science Foundation of China [61620106016, 61525503, 61378091, 61405123]
- Guangdong Natural Science Foundation Innovation Team [2014A030312008]
- Hong Kong, Macao and Taiwan cooperation innovation platform & major projects of international cooperation in Colleges and Universities in Guangdong Province [2015KGJHZ002]
- Shenzhen Basic Research Project [JCYJ20160328144746940, JCYJ20160308093035903, JCYJ20150930104948169, GJHZ20160226202139185]
In general, photonic nanojets (PNJs) occur only when the refractive index (Ri) difference between the microparticle and background media is less than 2. The minimum full width at half-maximum (FWHM) of the PNJ is similar to 130 nm (approximately one-third of the illumination wavelength lambda = 400 nm) formed within the evanescent field region. This paper proposes and studies a method to overstep the Ri upper bound and generate ultra-narrow PNJs. Finite element method based numerical investigations and rayoptics theoretical analyses have realized ultra-narrow PNJs with FWHM as small as 114.7 nm (0.28 lambda.) obtained from an edge-cut, length-reduced and parabolic-profiled microparticle with Ri = 2.5 beyond evanescent decay length. Using simple strain or compression operations, sub-diffraction-limited PNJs can be flexibly tuned on the order of several wavelengths. Such ultra-narrow PNJs offer great prospects for optical nonlinearity enhancements of greater enhancing effect, optical nanoscopy of higher spatial resolution, optical microprobes of smaller measurement accuracy, nano/micro-sized sample detections of higher sensing sensitivity, nanoscale objects of more accurate control, advanced manufactures of smaller processing size, optical-disk storage of larger data capacity and all-optical switching of lower energy consumption.
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