title: Biomedical Optics Express feature issue introduction: optical trapping applications (OTA).
abstract: This feature issue of Biomedical Optics Express presents studies which were the focus of the fourth OTA Topical Meeting that was held on 12-15 April 2015 in Vancouver, Canada.
authors.affiliation: School of Physics, The University of New South Wales, Sydney, NSW, Australia.
authors.forename: Peter
authors.initials: P
authors.lastname: Reece
authors.affiliation: University of Glasgow, James Watt South Building, Glasgow G12 8QQ, Scotland, UK.
authors.forename: Steven
authors.initials: S
authors.lastname: Neale
keywords: (000.0000) General; (000.1200) Announcements, awards, news, and organizational activities