title: RF imaging, architectures, and applications: introduction to the feature issue.
abstract: This Applied Optics feature issue spotlights developments in the emerging areas of millimeter, submillimeter, and terahertz imaging.
authors.affiliation: U.S. Army Night Vision and Electronic Sensors Directorate, Fort Belvoir, Virginia 22060, USA.
authors.forename: Keith A
authors.initials: KA
authors.lastname: Krapels
authors.forename: Neil A
authors.initials: NA
authors.lastname: Salmon
authors.forename: David A
authors.initials: DA
authors.lastname: Wikner
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Schuetz