零模波導再升級-構裝電漿子逆法拉第效應產生之特斯拉數量級磁場

Understanding bio-recognition process is substantial especially for thedevelopment of new treatment routes and pharmaceuticals for deadly diseasessuch as COVID-19. Typical bio-chemistry reactions include interactions betweenchiral molecules at bio-relevant concentrations, say, on the order of micromoles(~μM). To dig out the bio-recognition process, in particular, the spin exchangeenergy and the corresponding interaction force at single molecule level so as toavoid ensemble averaged effect, an efficient platform extending from previouslyestablished zero mode waveguide (ZMW) with spin/orbital photon enabledmagnetic field is proposed.In this two-year-project, inverse Faraday effect will be employed where ultrafastvortex optical beams will be used to excite a ring-shaped plasmonic ZMW togenerate an axially-oriented magnetic field. Combing the trion’s spin property oftransition metal dichalcogenide (TMD) WS2, exchange interactions due to thespatial symmetry effect arising from the singlet-triplet conversion as well as thechirality induced spin selectivity (CISS) effect can be studied all-optically.Theoretically, finite-difference time-domain (FDTD) method will be used tocalculated the plasmon enhanced axially-oriented magnetic field. Experimentally,focused ion beam (FIB) will be utilized in constructing the required ZMWstructure. Commercially available exfoliated WS2 will be transferred onto soda-lime glass which will be subsequently bonded to the substrate with the ZMW byplasmon assisted laser welding. The characterizations include intensitydependent photoluminescence (PL), real-time conical refraction (CR) resolvedpolarization, and magnetic circular dichroism (MCD) which are dedicated toanalyze the valley splitting, polarization evolution, and the strength of CISS underthe influence of an applied magnetic field.Following the fundamental research, realistic demonstration of the CISS effectwill be conducted where L- and D-cysteine will be used as the model moleculesalong with the magnetized surface. Enantio-selective adsorption will beperformed and enantiomer excess will be measured. Finally, a comprehensivepicture linking macroscopic phenomenon and microscopic mechanism will beconstructed.