Journal
OPTICS LETTERS
Volume 41, Issue 13, Pages 3029-3032Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.41.003029
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Funding
- BW Stiftung (Spitzenforschung II)
- ERC (Complexplas)
- DFG
- BMBF (PRINTOPTICS)
- Carl Zeiss Stiftung
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By using two-photon lithographic 3D printing, we demonstrate additive manufacturing of a dielectric concentrator directly on a LED chip. With a size of below 200 mu m in diameter and length, light output is increased by a factor of 6.2 in collimation direction, while the emission half-angle is reduced by 50%. We measure excellent form fidelity and irradiance patterns close to simulation. Additionally, a more complex shape design is presented, which exhibits a nonconventional triangular illumination pattern. The introduced method features exceptional design freedoms which can be used to tailor high-quality miniature illumination optics for specific lighting tasks, for example, endoscopy. (C) 2016 Optical Society of America
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