Journal
OPTICS EXPRESS
Volume 23, Issue 15, Pages 20096-20103Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.020096
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Funding
- National Research Foundation, Prime Minister's Office, Singapore [NRF-CRP10-2012-04]
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A novel design of decorating microsphere surface with concentric rings to modulate the photonic nanojet (PNJ) is investigated. By introducing the concentric ring structures into the illumination side of the microspheres, a reduction of the full width at half maximum (FWHM) intensity of the PNJ by 29.1%, compared to that without the decoration, can be achieved numerically. Key design parameters, such as ring number and depth, are analyzed. Engineered microsphere with four uniformly distributed rings etched at a depth of 1.2 mu m and width of 0.25 mu m can generate PNJ at a FWHM of 0.485 lambda (lambda = 400nm). Experiments were carried out by direct observation of the PNJ with an optical microscope under 405 nm laser illumination. As a result, shrinking of PNJ beam size of 28.0% compared to the case without the rings has been achieved experimentally. Sharp FWHM of this design can be beneficial to micro/nanoscale fabrication, optical super-resolution imaging, and sensing. (C) 2015 Optical Society of America
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