title: Dynamic manipulation of particles via transformative optofluidic waveguides.
abstract: Optofluidics is one of the most remarkable areas in the field of microfluidic research. Particle manipulation with optofluidic platforms has become central to optical chromatography, biotechnology, and μ-total analysis systems. Optical manipulation of particles depends on their sizes and refractive indices (n), which occasionally leads to undesirable separation consequences when their optical mobilities are identical. Here, we demonstrate rapid and dynamic particle manipulation according to n, regardless of size. Integrated liquid-core/solid-cladding (LS) and liquid-core/liquid-cladding (L(2)) waveguides were fabricated and their characteristics were experimentally and theoretically determined. The high and low n particles showed the opposite behaviors by controlling the contrast of their n values to those of the working fluids. The LS waveguide was found to successfully manipulate particles according to n, and the L(2) waveguide was found to provide additional system stability and flexibility, compared to the LS system.
authors.affiliation: Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea.
authors.forename: Kang Soo
authors.initials: KS
authors.lastname: Lee
authors.affiliation: Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea.
authors.forename: Kyung Heon
authors.initials: KH
authors.lastname: Lee
authors.affiliation: Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea.
authors.forename: Sang Bok
authors.initials: SB
authors.lastname: Kim
authors.affiliation: Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea.
authors.forename: Byung Hang
authors.initials: BH
authors.lastname: Ha
authors.affiliation: Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea.
authors.forename: Jin Ho
authors.initials: JH
authors.lastname: Jung
authors.affiliation: Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea.
authors.forename: Hyung Jin
authors.initials: HJ
authors.lastname: Sung
authors.affiliation: Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea.
authors.forename: Sang Soo
authors.initials: SS
authors.lastname: Kim