Spatial tracking of individual fluid dispersed particles via Raman spectroscopy.

We demonstrate a method for the spatial tracking of individual particles, dispersed in a fluid host, via Raman spectroscopy. The effect of moving a particle upon the intensity of different bands within its Raman spectrum is first established computationally through a scattering matrix method. By comparing an experimental spectrum to the computational analysis, we show that the position of the particle can be obtained. We apply this method to the specific cases of molybdenum disulfide and graphene oxide particles, dispersed in a nematic liquid crystal, and contained within a microfluidic channel. By considering the ratio and difference between the intensities of the two Raman bands of molybdenum disulfide and graphene oxide, we demonstrate that an accurate position can be obtained in two dimensions

Basic building blocks development for a SiN platform in the visible range

Integrated silicon photonics in the visible range is one of the areas that is emerging and growing in the market for different applications, such as: biosensing, optogenetics, quantum computing, imaging and display, fluorescence microscopy, cytometry, tomography, LIDAR and Lifi. Here, we present the first steps to build a process design kit of components in the visible range centered at 633 nm using a LPCVD silicon nitride platform. The first basic elements are presented (grating couplers, single mode waveguides and a MMI)

Silicon nitride photonics for the near-infrared

In recent years, silicon nitride (SiN) has drawn attention for the realisation of integrated photonic devices due to its fabrication flexibility and advantageous intrinsic properties that can be tailored to fulfill the requirements of different linear and non-linear photonic applications. This paper focuses on our progress in the demonstration of enhanced functionalities in the near infrared wavelength regime with our low temperature (<350 ºC) SiN platform. It discusses (de)multiplexing devices, nonlinear all optical conversion, photonic crystal structures, the integration with novel phase change materials, and introduces applications in the 2 µm wavelength range