کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1544410 | 1512888 | 2014 | 7 صفحه PDF | دانلود رایگان |
• We present the real-space observation of photonic nanojet in microspheres.
• The photonic nanojets are measured by using a scanning optical microscope.
• The results provide a new tool to detect nano-objects in a far-field optical system.
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.
We present the real-space observation of photonic nanojet in dielectric microspheres. Figure optionsDownload as PowerPoint slide
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 61, July 2014, Pages 141–147