Nonlinear optics

Efficiency of Raman measurements is increased by nearly four orders of magnitude with the help of sub-wavelength plasmonic gap waveguides.

The use of on-chip nonlinear waveguides that can convert 1.5-μm wavelength signals into the 2-μm region brings new opportunities for expanding the bandwidth of optical communications.

All-optical devices hold promise as a platform for ultralow-power, sub-nanosecond photonic classical and quantum information processing. Measurements of the dynamics of a single photon switch unveil the quantum correlations at the root of its operation.

Multilayered ferroelectric NbOI₂ crystals with sub-100-nm thickness exhibit efficient second harmonic generation, paving the way for on-chip nonlinear optical components.

Breaking reciprocity at the nanoscale can produce directional formation of images due to the asymmetric nonlinear optical response of subwavelength anisotropic resonators. The self-induced passive non-reciprocity has advantages compared to magnet or time modulation approaches and may impact both classical and quantum photonics.