Photonic nanojets generated by microfabricated dielectric cylinders using proton beam writing

Photonic nanojet (PNJ) is an optical phenomenon that focuses incident light to a sub-wavelength beam waist/width and several wavelength long beam length by scattering with a microstructure. Here, we report on the PNJs directly generated along the axial axis of poly(methyl methacrylate) (PMMA) micro-...

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Veröffentlicht in:Applied physics letters 2023-10, Vol.123 (14)
Hauptverfasser: Kosumsupamala, Kunpisit, Tobe, Keito, Tsuji, Akihiro, Seya, Daiya, Seki, Hironori, Puttaraksa, Nitipon, Matsui, Tatsunosuke, Nishikawa, Hiroyuki
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Sprache:eng
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Zusammenfassung:Photonic nanojet (PNJ) is an optical phenomenon that focuses incident light to a sub-wavelength beam waist/width and several wavelength long beam length by scattering with a microstructure. Here, we report on the PNJs directly generated along the axial axis of poly(methyl methacrylate) (PMMA) micro-cylinders of 2, 4, 6, and 8 μm diameters fabricated by proton beam writing approach. Experimental results reveal that the PMMA micro-cylinders were produced with smooth surfaces, which are appropriate to form the PNJs. Accordingly, the PNJs were measured by using an in-house confocal microscope apparatus. The results show that the larger micro-cylinder diameters led to wider and longer PNJs, which agree well with the finite-difference time-domain simulation. This fabrication of micro-cylinders could offer specific PNJ properties for advancing sub-wavelength applications.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0169290