Hannover 2020 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 37: Ultrashort Laser Pulses

Q 37.6: Vortrag

Mittwoch, 11. März 2020, 15:15–15:30, f435

Spontaneous Four-Wave Mixing Light Source in Silicon Nitride Waveguide for Coherent Raman Scattering — •Niklas M. Lüpken1, Thomas Würthwein1, Klaus-J. Boller2,1, and Carsten Fallnich1,21Institute of Applied Physics, University of Münster, Corrensstraße 2, 48149 Münster, Germany — 2MESA+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands

Silicon nitride (Si3N4) waveguides offer an on-chip platform with a small footprint, a high nonlinear refractive index, and tight mode confinement. Therefore, nonlinear processes such as four-wave mixing (FWM) or supercontinuum generation can be driven very efficiently, e.g., for broadband optical frequency combs [1].

Within this contribution, we present a light source for coherent anti-Stokes Raman scattering (CARS) microscopy, with the potential to be set up as an all-integrated device, based on spontaneous FWM in Si3N4 waveguides with only a single ultrafast fiber-based pump source at 1030 nm wavelength. During the FWM process in the Si3N4 waveguide, broadband signal and idler pulses are generated, such that the idler pulses and the residual pump pulses can be used for CARS measurements, enabling chemically selective and label-free imaging over the entire fingerprint region by addressing vibrational energies from 500 cm−1 to 1800 cm−1.

[1] Porcel et al., Opt. Express 25, 1542 (2017).

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