Kaunas University of Technology, Lithuania
Novel plasmonic subwavelength optical sensor for kinetic measurements
The project aims at the developing of novel periodic structures dedicated to the total internal reflection optical sensors enabling high sensitivity, providing controllable optical properties and stability against physical and chemical actions and comaptible with microfluidic devices. This kind of optical sensors employ evanescent wave that propagates along the surface of diffraction grating and interacts with the analyte. Illuminating such system with white linearly polarized light and analyzing spectral composition of the reflected/transmitted/wave-guided light one can measure in real time kinetics of the changes of refraction index of the analyte. Employing reactive magnetron sputtering deposition system of diamond like carbon, technologies of production 1D and 2D periodic structures (laser interference lithography) as well as dry etching methods (reactive ion sputtering) diffractive elements /chips will be produced in the layers of diamond like carbon based nanocomposite films (Ag, Cu). Due to plasmon surface resonance in the nanocomposite diamond like carbon films this kind of diffractive chips will combine advantages of at least three physical principles used in the technology of sensors: surface evanescent wave, light propagating in subwavelength grating, plasmonic interaction. This will enhance sensibility and field of potential applications of the sensor. Sensors with the high sensitivity and corresponding optical properties will be applied in the systematic studies of refraction index kinetics in different materials (solutions, colloids, cells). These measurements will be performed with a setup of computer controlled angular measurement system supported with a new type of sensor. Modelling of the optical processes will be done with the original softawre based on a RCWA method.
Research Council of Lithuania
Research Fund of Kaunas University of Technology
WG1: Integrated Microfluidic Photonics