title: Rotational diffusion measurements using polarization-dependent fluorescence correlation spectroscopy based on superconducting nanowire single-photon detector.
abstract: Conventional polarization-dependent fluorescence correlation spectroscopy (pol-FCS) requires two sets of photon detectors to eliminate after-pulse noises (dual-channel pol-FCS; DC-pol-FCS) in the sub-microsecond range. In this study, we successfully realized pol-FCS using a visible-wavelength superconductive nanowire single-photon detector (single-channel pol-FCS; SC-pol-FCS). The detector used is free of after-pulse noises and thus eliminates the need for dual channels in pol-FCS. Further, the optics in the SC-pol-FCS system are easier to adjust than those in the conventional system. Consequently, we obtained higher signal-to-noise ratios compared with conventional DC-pol-FCS systems. Thus, SC-pol-FCS is a potentially useful system for obtaining pol-FCS measurements, and can facilitate improved rotational diffusion studies.
authors.forename: Johtaro
authors.initials: J
authors.lastname: Yamamoto
authors.forename: Makoto
authors.initials: M
authors.lastname: Oura
authors.forename: Taro
authors.initials: T
authors.lastname: Yamashita
authors.forename: Shigehito
authors.initials: S
authors.lastname: Miki
authors.forename: Takashi
authors.initials: T
authors.lastname: Jin
authors.forename: Tokuko
authors.initials: T
authors.lastname: Haraguchi
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Hiraoka
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Terai
authors.forename: Masataka
authors.initials: M
authors.lastname: Kinjo