Design and fabrication of lens selectively coated with TFMG for uniform intensity of UV LED

P. H. Lin, C. T. Pan, Y. C. Chen, F. T. Hsu, P. H. Lin, S. C. Shen, J. C. Huang, C. M. Chang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

This UV LED lighting technology developed in this study is expected to be applied to photolithography industry. Since the accuracy of the degree of cross linking and sidewall profile could be affected by intensity of UV light dosage, this research proposes optical design and fabrication of free-curved lens for light source element of UV LED for exposure machines. In this study, the optical intensity distributions of the lens with TFMG were determined by using commercial optical simulation FRED software. Based on the design, the lenses were fabricated using thermoforming of optical glass and PMMA, respectively. Then the lens is selectively coated with thin film metallic glasses (TFMG, Ag30 Mg45 Al25). For the TFMG coating, multi-target sputtering system is applied to sputter TFMG reflecting film on the surface of lens with thickness of 100 nm to 300 nm. With the both design of TFMG selective deposition and lens curve, the optical field of Lambertian emission patterns of UV LED can be transformed to uniform profile. Through this design of reflection of UV LED light source, the intensity and uniformity could be enhanced. UV LED light source with 360 to 390 nm in wavelength was chosen as light source to simulate the effects of I-line and G-line. The specific wavelength of UV light is measured by spectrometer (USB2000+VIS-NIR, Ocean Optics) and BM7.

Original languageEnglish
Title of host publication9th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, IEEE-NEMS 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages477-480
Number of pages4
ISBN (Electronic)9781479947270
DOIs
Publication statusPublished - 2014 Sep 23
Event9th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, IEEE-NEMS 2014 - Waikiki Beach, United States
Duration: 2014 Apr 132014 Apr 16

Publication series

Name9th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, IEEE-NEMS 2014

Other

Other9th IEEE International Conference on Nano/Micro Engineered and Molecular Systems, IEEE-NEMS 2014
CountryUnited States
CityWaikiki Beach
Period14-04-1314-04-16

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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