The molded microlens: (a) top view, (b) bottom view, (c) side view, and (d) image profile of the top surface.
Microlens focal length measurement: (a) schematic diagram of the optical setup and (b) actual prototype.
The setup using for determining the imaging power of lenses: (a) schematic diagram and (b) actual prototype.
Optical setup used for analyzing the fluorescence collection efficiency: (a) schematic and (b) actual prototype.
The imaging system using the microlens-ended fiber: (a) schematic diagram and (b) actual prototype.
Schematic of the endoscopic probe.
Images and light distributions taken at different distances from lens surface: (a) at 100 μm distance form lens surface, (b) at 600 μm distance form lens surface, (c) at 1000 μm distance form lens surface, and (d) at focal point.
Image of the last four element of group number (a) when microlens is attached to the fiber facet and (b) without the microlens.
Comparison between spectrum of the collected light from the fluorescent target when the microlens is attached to the fiber and when it is not attached.
The spectrum collected by four different lenses.
The spectrum collected in different “d” values.
Images taken from the microsphere sample at working distance of 10 mm: (a) with lens and (b) without lens.
Images of the microspheres in different planes at (a) 11.2 mm, (b) 9.2 mm, and (c) 7.2 mm distance from the probe.
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