Abstract
This paper presents two facile methods to fabricate off-plane lenses made of SU-8, an epoxy-based negative photoresist from MicroChem, on glass for optical interconnection. The methods allow the fabrication of lenses with flexible spot size and focal length depending on SU-8 well size and SU-8 drop volume and viscosity. In the first method, SU-8 drops were applied directly into patterned SU-8 wells with Teflon-coated micropipettes, and were baked to become (a)-spherical lenses. The lens shape and size were mainly determined by SU-8 viscosity, ratio of drop volume to well volume, and baking temperature and time. In the second method, a glass substrate with SU-8 patterned wells was emerged in diluted SU-8, then drawn up and baked to form lenses. The lens shapes and sizes were mainly determined by SU-8 viscosity and well volume. By the two methods, SU-8 lenses were successfully fabricated with spot sizes varying in range from micrometers to hundred micrometers, and focal lengths varying in range of several millimeters, depending on the lens rim diameters and aspheric sag height. Besides, on-plane SU-8 lenses were fabricated by photolithography to work in conjunction with the off-plane SU-8 lenses. The cascaded lenses produced light spots reduced to several micrometers, and they can be applied as a coupler for light coupling from fiber/Light-emitting diode (LED) to microstructures and nanostructures. The results open up the path for fabricating novel optical microsystems for optical communication and optical sensing applications.
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References
A.L.D. Kehinde and F.P. Payne, J. Lightwave Technol. 25, 834 (2007)
S.G. Johnson, P. Bienstman, M.A. Skorobogatiy, M. Ibanescu, E. Lidorikis, and J.D. Joannopoulos, Phys. Rev. E66, 066608-1-15 (2002)
S. Yerolatsitis, I. Gris-Sánchez, and T.A. Birks, Opt. Express 22, 608 (2014)
J. Yan (闫建华), W. Ou (欧文), and Y. Ou (欧毅) Semiconductors+, 33(3), 034008-1-4 (2012)
H.C. Wei and G.D. J Su, J. Micromech. Microeng. 22, 025007-1-8 (2012)
Y.-S. Cherng and G.-D. J. Su, J. Micromech. Microeng. 24, 015016-1-10 (2014)
H. Ottevaere and H. Thienpont, J. Opt. A Pure. Appl. Opt. 8, 407 (2006)
S.C. Shenand and J.C. Huang, Opt. Express 17, 13122 (2009)
C.C. Wu, Y.D. Tseng, S.M. Kuo, and C.H. Lin, Opt. Express 19, 22993 (2011)
N. Ma, P.C. Ashok, D.J. Stevenson, F.J. Gunn-Moore, and K. Dholakia, Biomed. Opt. Express 1, 694 (2010)
J-N Kuo, C-C Hsieh, S-Y Yang, and G-B Lee, J. Micromech. Microeng. 17, 693 (2007)
A. Tripathi and N. Chronis, J. Micromech. Microeng. 21, 105024 (2011)
J.J. Chen, T.Y. Wang, K.L. Huang, T.S. Liu, M.D. Tsai, and C.T. Lin, Opt. Express 20, 10984 (2012)
J. Godin, V. Lien, and Y.H. Lo, Appl. Phys. Lett. 89, 061106 (2006)
Y Zhao, Q Li, H Xiao-Ming, and D-F Yang, Photonics Lasers Med. 2, 51 (2013)
M.H. Nguyen, C.J. Chang, M.C. Lee, and F.G. Tseng, Opt. Express 19, 18956 (2011)
M.H. Nguyen, T.H. Nguyen, H.B. Nguyen, F.G. Tseng, J.R. Lai, M.C. Lee, and K.N. Ku, Proceeding of The Fourth International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO), (Taipei, Oct 27–31, 2014), pp. 240–243.
Acknowledgements
This work was done under a Vietnam-Taiwan joint research Grant (Code: 25/2014/HĐ-NĐT) and the Taiwan NSC Project (Code: 102WFA0400674). We also highly appreciate help and cooperation from our colleges in Nano-/Micro-Bio-Opto-Electro- Mechanical Systems and Fluidics Laboratory (Department of Engineering and System Science) and Microscopic Optical System Lab (Institute of Photonics Technology), National Tsing Hua University, Taiwan, for their assistance in lens fabrication and optical measurement.
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Nguyen, MH., Nguyen, HB., Nguyen, TH. et al. SU-8 Lenses: Simple Methods of Fabrication and Application in Optical Interconnection Between Fiber/LED and Microstructures. J. Electron. Mater. 45, 2529–2535 (2016). https://doi.org/10.1007/s11664-016-4408-6
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DOI: https://doi.org/10.1007/s11664-016-4408-6