Design and evaluation of wafer level UV-imprinted aspherical square microlens array to increase ray convergence efficiency of image sensor

Seok Min Kim, Joong Hee Min, Jiseok Lim, Minseok Choi, Gunhee Han, Shinill Kang

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

With the increasing demands of compact imaging module, the pixel size of image sensor has been decreased, and the design and fabrication of micro condensing elements have become a priority. A methodology for design and evaluation of wafer level UV-imprinted aspherical square microlens to increase ray conversance efficiency of image sensor was developed. A numerical method to model the surface of reflowed square microlens was proposed. To design the aspherical square microlens array, the effect of lens shape on the ray convergence efficiency was examined considering the misalignment, the residual layer thickness and the excessive chief ray angle. Finally, the designed square microlens array was integrated on a simulated image sensor substrate by a wafer level UV nano imprinting, and the ray convergence efficiency was measured and compared with the simulated results.

Original languageEnglish
Pages (from-to)6667-6671
Number of pages5
JournalJapanese journal of applied physics
Volume47
Issue number8 PART 2
DOIs
Publication statusPublished - 2008 Aug 22

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Image sensors
rays
wafers
evaluation
sensors
condensing
Lenses
Numerical methods
Pixels
misalignment
Imaging techniques
Fabrication
modules
pixels
lenses
Substrates
methodology
fabrication

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

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abstract = "With the increasing demands of compact imaging module, the pixel size of image sensor has been decreased, and the design and fabrication of micro condensing elements have become a priority. A methodology for design and evaluation of wafer level UV-imprinted aspherical square microlens to increase ray conversance efficiency of image sensor was developed. A numerical method to model the surface of reflowed square microlens was proposed. To design the aspherical square microlens array, the effect of lens shape on the ray convergence efficiency was examined considering the misalignment, the residual layer thickness and the excessive chief ray angle. Finally, the designed square microlens array was integrated on a simulated image sensor substrate by a wafer level UV nano imprinting, and the ray convergence efficiency was measured and compared with the simulated results.",
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Design and evaluation of wafer level UV-imprinted aspherical square microlens array to increase ray convergence efficiency of image sensor. / Kim, Seok Min; Min, Joong Hee; Lim, Jiseok; Choi, Minseok; Han, Gunhee; Kang, Shinill.

In: Japanese journal of applied physics, Vol. 47, No. 8 PART 2, 22.08.2008, p. 6667-6671.

Research output: Contribution to journalArticle

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AU - Min, Joong Hee

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AU - Han, Gunhee

AU - Kang, Shinill

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