Real-space observation of photonic nanojet in dielectric microspheres |
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| Affiliation: | 1. Photonics Laboratory, Physics Department, Kharazmi University, Tehran, Iran;2. Physics Department, Hakim Sabzevari University, Sabzevar, Iran;1. Institute of Micro-engineering and Nanoelectronics, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;2. Physics and Astronomy Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia;3. Materials Science and Technology Division (MST-7), Los Alamos National Laboratory, Los Alamos, NM 87545, USA;4. Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8520, Japan;5. Physica Faculty, Eastern European university, Lutsk, Voli 6, Ukraine;6. Faculty of Electrical Engineering, Czestochowa University technology, Armii Krajowej 17, PL-42201 Czestochowa, Poland;1. Department of Biochemistry, University of Zürich, Winterthurestrasse 190, CH-8057 Zürich, Switzerland;2. DICeA, Università di Firenze, via Santa Marta 3, I-50139 Firenze, Italy;1. Russian Armenian (Slavonic) University, Yerevan 0051, Armenia;2. Department of Medical Physics, Yerevan State Medical University, Yerevan 375025, Armenia;1. State Key Laboratory of Software Development Environment and Department of Physics, Beihang University, Beijing 100191, China;2. Faculty of Engineering, The University of Nottingham Ningbo, Ningbo 315100, China;3. School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China;1. Department of Physics, Indian Institute of Science Education and Research, Pune 411008, India;2. Laser Bhawan, School of Physics, Devi Ahilya University, Indore 452 001, India;3. Department of Applied Physics, Shri G. S. Institute of Technology and Science, Indore 452 003, India |
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| Abstract: | 
The three-dimensional real-space observation of photonic nanojet in different microspheres illuminated by a laser is reported. The finite-difference time-domain technique is used to perform the three-dimensional numerical simulation for the dielectric microspheres. The key parameters of photonic nanojet are measured by using a scanning optical microscope system. We reconstruct the three-dimensional real-space photonic nanojets from the collected stack of scanning images for polystyrene microspheres of 3 μm, 5 μm, and 8 μm diameters deposited on a glass substrate. Experimental results are compared to calculations and are found in good agreement with simulation results. The full width at half-maximum of the nanojet is 331 nm for a 3 μm microsphere at an incident wavelength of 633 nm. Our investigations show that photonic nanojets can be efficiently imaged by a microsphere and straightforwardly extended to rapidly distinguish the nano-objects in the far-field optical system. |
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| Keywords: | Photonic nanojet Microsphere Microscopy |
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