Optical frequency comb (OFC) spectroscopy in the mid-infrared (MIR) promises faster, more precise, or more sensitive molecular spectroscopy. To date, demonstrations of MIR OFCs have suffered from low power, poor wavelength coverage, or low sensitivity. Systems that do excel in these areas have high cost and complexity.
The new MIR OFC generation method presented here overcomes these limitations. Phase modulation of a CW laser forms an NIR OFC, which pumps a singly resonant, single frequency optical parametric oscillator (OPO). The OPO output is an MIR OFC, which is tunable between 2200 - 4000 nm with >1 W output power.
TOPTICA's TOPO, a cw-OPO, tunes from 1.45 - 4.00+ µm with high resolution and narrow linewidth. All tuning is computer-controlled, allowing for automated tuning. It is the ideal light source for molecular spectroscopy, mid-IR photonic device characterization, and near-field microscopy. In this presentation we will describe the system and demonstrate its ease of use: We will use our automated tuning routines to stabilize the TOPO idler to a target wavelength, and demonstrate our wavelength scanning software which scans the TOPO over a user-defined range.
In recent studies, optical forces have been exploited to guide particles along waveguides and to trap particles near
refractive index sensors. But the ability of photonic devices to bind a freely flowing particle from an adjacent
microfluidic channel has yet to be fully characterized. In order to determine the ability of a given device to trap an
arbitrary particle, we develop a method to numerically calculate the trajectory of a particle flowing near a model system.
We determine the trajectories of 50 nm radius particles in a fluid flowing at an average velocity of 1 cm/s near a
photonic crystal resonator pumped at 1 W. The finite element method is used to calculate the force of the fluid on the
particles and finite-difference time-domain simulations are used to calculate optical forces. The particle equation of
motion is solved using the adaptive Runge-Kutta method.
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