Periodic structures of photonic core fibers (PCFs) allow the formation of guided modes even in cores with refractive index lower than that of the cladding. A hollow core surrounded by the periodic structure can be filled up with different (gaseous or liquid) substances, which will alter the guiding properties (effective index of refraction, wavelength, photonic bandgap, attenuation, etc.) of the optical fibers in a measurable manner. Measuring these properties in the presence of biological samples allow the utilization of PCFs as sensitive biosensors or analyzers. The other advantage of the PCF structure is the wide range in which its dispersion and nonlinear properties can be varied so that an appropriate set of parameters allows the realization of collinear phase matching to produce quantum optical phenomenon that fits to all-fiber-optic systems. Within the framework of this proposal the applicant will join the projects NVKP_16-1-2016-0049 “Development of a modular, direct and immunofluorimetry as well as plasma spectroscopy based detector and instrument family for in situ, complex water quality monitoring, and application studies”, and 2017-1.2.1-NKP-2017-00001 “Realization and sharing of qubits, and development of quantum information networks”.
Tasks: (1) Investigation of PCF based experimental system to demonstrate fundamental quantum biological phenomena (e.g. photosynthetic quantum efficiency and role of quantum entanglement in photosynthetic energy transfer) in plants using pico- and nanosecond scale laser excitation at room temperature; and its comparison to capillary based setups. (2) A PCF core represents a small analytic volume with large effective cross section for fluorescent excitation. In case of low sample concentration, the detection sensitivity can be increased by means of immunofluorescent techniques. In this procedure an antigene–antibody chain is introduced in the analytic solution that selectively bonds to the molecule under test. Labeling the chain with a fluorophore gives information on the presence and concentration of the targeted substance selectively. (3) Investigation of the dispersion and nonlinear properties of PCFs to demonstrate a twin-photon source based on collinear phase matching. Some elements of the proposal are beyond the frameworks of the related projects, so their weight may vary according to the advances in the proposed work and the projects.
Fluent English required. Good abstraction and math skills, fundamental knowledge of optics, optoelectronics and laser physics, interdisciplinary approach and high degree of self-support. Fundamental optical design skills (e.g. in Zemax environment) are preferred.