Infrared spectroscopy articles within Nature Photonics

Featured

  • Article |

    Two-photon excitation with mid- and near-infrared pulses encodes bond selectivity in fluorescence imaging. Single-molecule imaging and spectroscopy is demonstrated on individual fluorophores as well as various labelled biological targets.

    • Haomin Wang
    • , Dongkwan Lee
    •  & Lu Wei

  • Letter
    | Open Access

    An ultrabroadband femtosecond enhancement cavity is developed, using gold-coated mirrors and a wedged-diamond-plate input coupler. Simultaneous enhancement of a 22–40 THz offset-free frequency comb allows cavity-enhanced time-domain spectroscopy of gas mixtures based on electro-optic sampling in the mid-infrared range.

    • Philipp Sulzer
    • , Maximilian Högner
    •  & Ioachim Pupeza

  • Article |

    A single-photodetector spectrometer based on black phosphorus is demonstrated in the wavelength range from 2 to 9 μm. The footprint is 9 × 16 μm2. The spectrometer is free from bulky interferometers and gratings, and is electrically reconfigurable.

    • Shaofan Yuan
    • , Doron Naveh
    •  & Fengnian Xia

  • Article |

    Photoacoustic detection highly localized with a pulsed ultraviolet laser based on the Grüneisen relaxation effect allows water-background suppressed mid-infrared (MIR) imaging of lipids and proteins at ultraviolet resolution, at least an order of magnitude finer than the MIR diffraction limits.

    • Junhui Shi
    • , Terence T. W. Wong
    •  & Lihong V. Wang

  • Letter |

    Quantum cascade laser frequency combs are coherently locked to an external radio-frequency source even in extremely high-feedback conditions. The internal phase-locking mechanism and the possibility of all-electric stabilization are investigated.

    • Johannes Hillbrand
    • , Aaron Maxwell Andrews
    •  & Benedikt Schwarz

  • Article |

    By employing difference-frequency generation, a mid-infrared dual-comb spectrometer covering the 2.6 to 5.2 µm range is demonstrated with comb-tooth resolution, sub-MHz frequency precision and accuracy, and a spectral signal-to-noise ratio as high as 6,500.

    • Gabriel Ycas
    • , Fabrizio R. Giorgetta
    •  & Nathan R. Newbury

  • Article |

    Single-particle double-modulation absorption spectrometers based on whispering-gallery-mode microresonators achieve sub-100-Hz sensitivity to photothermal resonance shifts and allow for the study of arrays of Fano resonances in the context of plasmonic–photonic hybridization.

    • Kevin D. Heylman
    • , Niket Thakkar
    •  & Randall H. Goldsmith

  • Letter |

    The refractive index and absorption coefficient of a medium in the infrared range are measured using visible spectral range components. The technique relies on nonlinear interference of infrared and visible photons, produced by down-conversion.

    • Dmitry A. Kalashnikov
    • , Anna V. Paterova
    •  & Leonid A. Krivitsky

  • Letter |

    A compact source that generates sub-two-cycle-duration pulses with an average power of 0.1 W spanning 6.8–16.4 μm combines the properties of power scalability, high repetition rate and phase coherence for the first time in this spectral region.

    • I. Pupeza
    • , D. Sánchez
    •  & J. Biegert

  • Article |

    A 10 μm quantum cascade laser is phase-locked to a remote ultrastable laser referenced to primary frequency standards using an optical frequency comb. The obtained relative stability of 2 × 10−15 is record-breaking in the mid-infrared region.

    • Bérengère Argence
    • , Bruno Chanteau
    •  & Anne Amy-Klein

  • News & Views |

    The demonstration of chalcogenide fibre-based supercontinuum sources that reach beyond a wavelength of ten micrometres is set to have a major impact on spectroscopy and molecular sensing.

    • Günter Steinmeyer
    •  & Julia S. Skibina

  • Letter |

    Mid-infrared spectroscopy with nanometre spatial resolution is highly desired for materials and life sciences applications. A nanoscale mid-infrared spectrometer is demonstrated that detects mechanical forces exerted by molecules on an atomic force microscope tip upon light excitation. It operates under ambient conditions with a high sensitivity and a spatial resolution of better than 25 nm.

    • Feng Lu
    • , Mingzhou Jin
    •  & Mikhail A. Belkin

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