title: A modified fractal zone plate with extended depth of focus in spectral domain optical coherence tomography.
abstract: In optical coherence tomography (OCT) systems, there is a trade-off between the depth of focus (DOF) and lateral resolution when conventional lenses are used. We propose a new method that employs a modified fractal generalized zone plate (MFraGZP) combined with a conventional lens to improve the trade-off effect, with an extended DOF of about 2.5 mm (14 times larger) while the lateral resolution is maintained at ~9.5μm. As an example, images of the calibration microspheres are obtained and demonstrated with the extended DOF in a spectral domain OCT system.
authors.affiliation: Institute of Modern Optics, Key Laboratory of Optoelectronic Information Science and Technology, Ministry of Education of China, Nankai University, Tianjin 300071, People's Republic of China.
authors.forename: Q Q
authors.initials: QQ
authors.lastname: Zhang
authors.affiliation: Institute of Modern Optics, Key Laboratory of Optoelectronic Information Science and Technology, Ministry of Education of China, Nankai University, Tianjin 300071, People's Republic of China.
authors.forename: J G
authors.initials: JG
authors.lastname: Wang
authors.affiliation: Institute of Modern Optics, Key Laboratory of Optoelectronic Information Science and Technology, Ministry of Education of China, Nankai University, Tianjin 300071, People's Republic of China.
authors.forename: M W
authors.initials: MW
authors.lastname: Wang
authors.affiliation: Institute of Modern Optics, Key Laboratory of Optoelectronic Information Science and Technology, Ministry of Education of China, Nankai University, Tianjin 300071, People's Republic of China.
authors.forename: J
authors.initials: J
authors.lastname: Bu
authors.affiliation: Nankai University Affiliated Hospital, Tianjin 300121, People's Republic of China.
authors.forename: S W
authors.initials: SW
authors.lastname: Zhu
authors.affiliation: Department of Bioengineering, Clemson University, Clemson, SC 29634, USA.
authors.forename: R
authors.initials: R
authors.lastname: Wang
authors.affiliation: Department of Bioengineering, Clemson University, Clemson, SC 29634, USA.
authors.forename: Bruce Z
authors.initials: BZ
authors.lastname: Gao
authors.affiliation: Institute of Modern Optics, Key Laboratory of Optoelectronic Information Science and Technology, Ministry of Education of China, Nankai University, Tianjin 300071, People's Republic of China.
authors.forename: X-C
authors.initials: XC
authors.lastname: Yuan
keywords: depth of focus; fractal zone plate; optical coherence tomography