title: Trapping of a single DNA molecule using nanoplasmonic structures for biosensor applications.
abstract: Conventional optical trapping using a tightly focused beam is not suitable for trapping particles that are smaller than the diffraction limit because of the increasing need of the incident laser power that could produce permanent thermal damages. One of the current solutions to this problem is to intensify the local field enhancement by using nanoplasmonic structures without increasing the laser power. Nanoplasmonic tweezers have been used for various small molecules but there is no known report of trapping a single DNA molecule. In this paper, we present the trapping of a single DNA molecule using a nanohole created on a gold substrate. Furthermore, we show that the DNA of different lengths can be differentiated through the measurement of scattering signals leading to possible new DNA sensor applications.
authors.affiliation: School of Mechatronics, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan-gwagiro (Oryong-dong), Buk-gu, Gwangju, 500-712, South Korea.
authors.forename: Jung-Dae
authors.initials: JD
authors.lastname: Kim
authors.affiliation: School of Mechatronics, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan-gwagiro (Oryong-dong), Buk-gu, Gwangju, 500-712, South Korea.
authors.forename: Yong-Gu
authors.initials: YG
authors.lastname: Lee
keywords: (140.7010) Laser trapping; (240.3695) Linear and nonlinear light scattering from surfaces; (240.6680) Surface plasmons; (250.5403) Plasmonics; (310.6628) Subwavelength structures, nanostructures; (350.4855) Optical tweezers or optical manipulation