Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 21, Issue 20, Pages 1535-1537Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2009.2029346
Keywords
Aspherical lens; femtosecond laser; high fill-factor; microlens array
Funding
- NSFC [60677016, 60525412, 60877019, 90923037]
- NECT [070354]
- Jilin Provincial Science and Technology Foundation [20070109]
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Substitution of a single aspheric microlens (array) for a complex multilens system results in not only smaller size, lighter weight, compacter geometry, and even possibly lower cost of an optical system, but also significant improvement of its optical performance such as better imaging quality. However, fabrication of aspheric microlens or microlens array is technically challenging because conventional technologies used for macro-sized aspheres like single-point diamond milling, and those for spherical microlens like thermal reflow, are not capable of defining a complicated lens profile in an area as small as several to tens of micrometers. Here we solve the problem by using femtosecond laser micro-nanofabrication via two photon polymerization. Not only well-defined single lens, but also 100% filling ratio aspheric microlens array were readily produced. The average error of the lens profile is only 17.3 nm deviated from the theoretical model, the smallest error reported so far.
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