title: Self-referenced ultra-broadband transient terahertz spectroscopy using air-photonics.
abstract: Terahertz (THz) air-photonics employs nonlinear interactions of ultrashort laser pulses in air to generate and detect THz pulses. As air is virtually non-dispersive, the optical-THz phase matching condition is automatically met, thus permitting the generation and detection of ultra-broadband THz pulses covering the entire THz spectral range without any gaps. Air-photonics naturally offers unique opportunities for ultra-broadband transient THz spectroscopy, yet many critical challenges inherent to this technique must first be resolved. Here, we present explicit guidelines for ultra-broadband transient THz spectroscopy with air-photonics, including a novel method for self-referenced signal acquisition minimizing the phase error, and the numerically-accurate approach to the transient reflectance data analysis.
authors.forename: F
authors.initials: F
authors.lastname: D'Angelo
authors.forename: H
authors.initials: H
authors.lastname: Němec
authors.forename: S H
authors.initials: SH
authors.lastname: Parekh
authors.forename: P
authors.initials: P
authors.lastname: Kužel
authors.forename: M
authors.initials: M
authors.lastname: Bonn
authors.forename: D
authors.initials: D
authors.lastname: Turchinovich