Replication of high refractive index glass microlens array by imprinting in conjunction with laser assisted rapid surface heating for high resolution confocal microscopy imaging

Taekyung Kim, Mohd Zairulnizam Bin Mohd Zawawi, Ryung Shin, Donghyun Kim, Woojae Choi, Chul Park, Shinill Kang

Research output: Contribution to journalArticle


In a multi optical probe confocal imaging system utilizing a microlens arrays as an objective lens, a high numerical aperture is required to improve resolving power. Glass microlens arrays are suitable for high-resolution imaging since they provide outstanding optical properties with a high refractive index. We demonstrated the rapid fabrication of microlens arrays on a high refractive index optical glass substrate via laser assisted thermal imprinting. The optical performance of the fabricated glass microlens arrays were evaluated and compared to that of a polymer microlens. In contrast to the polymer, the real image afforded by, and the calculated resolution of, the imprinted glass microlens arrays were significantly better, at about 0.73 µm compared to the polymer (∼1.56 µm). Our results reveal the considerable potential of direct thermal imprinting as a rapid, single-step, low cost fabrication method for replication of glass microlens array of high dimensional accuracy affording excellent optical performance.

Original languageEnglish
Pages (from-to)18869-18882
Number of pages14
JournalOptics Express
Issue number13
Publication statusPublished - 2019 Jan 1


All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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