Optical: systems and elements – Lens – Microscope objective
Reexamination Certificate
2006-05-09
2006-05-09
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
Microscope objective
C359S656000, C359S721000
Reexamination Certificate
active
07042649
ABSTRACT:
Soft lithography with surface tension control is used to microfabricate extremely efficient solid immersion lenses (SILs) out of rubber elastomeric material for use in microscope type applications. In order to counteract the surface tension of the mold material in a negative mold that causes creep on a positive mold, material such as RTV is partially cured before use in order to allow the reticulation of polymer chains to change the viscosity of the uncured material in a controllable manner. In a specific embodiment, the techniques of soft lithography with surface tension control are used to make molded SILs out of the elastomer polydimethylsiloxane. The lenses achieve an NA in the range of 1.25. The principle of compound lens design is used to make the first compound solid immersion lens, which is corrected for higher light gathering ability and has a calculated NA=1.32. An important application of these lenses is integrated optics for microfluidic devices, specifically in a handheld rubber microscope for microfluidic flow cytometry.
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Gambin Yann
Legrand Oliver
Quake Stephen R.
California Institute of Technology
Lester Evelyn A.
Townsend and Townsend / and Crew LLP
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