P-060

Andrej Dementjev

andrej.dementjev@ftmc.lt

Paulius Rindzevičius, Sergei Malykhin, Yuri Svirko, Polina Kuzhir, Renata Karpicz

Center for Physical Sciences and Technology (FTMC), Lithuania

Chemical imaging of microcrystals by means of CARS microscopy

Coherent anti-Stokes Raman scattering (CARS) technique is based on interference of the scattered light from each molecule of material resulting in the enhancement of the desired signal. The largest enhancement here is expected from highly ordered structures such as a bulk material. This advantage of CARS technique opens a great opportunity for chemical imaging of crystals revealing their crystallinity, orientation of crystalline axis and another structural property. In this work we demonstrate utility of the CARS microscopy in studying of diamond crystals. Polarization dependence of CARS response from the diamond was applied to evaluate the perfection of diamond crystalline structure. Crystalline properties of diamond are very important in its application as a quantum sensor. CARS spectrum of diamond is purely resonant and therefor reflects vibrations of crystalline lattice. Because vibrational oscillators are strongly oriented within lattice, polarization-sensitive measurements can be used as an indicator of crystalline axis orientation. For a certain orientation of the linear polarization of incoming light, the vibrational response from diamond completely disappears. This observation means that the oscillators are not excited in this direction. Such a case corresponds to the single-crystal structure of a diamond needle. These needles have the necessary physical properties for application in quantum sensing field. 

This work was accomplished through the financial support of Horizon Europe MSCA FLORIN Project No. 101086142, QuantERA project EXTRASENS, supported by the Research Council of Lithuania, Project No. S-QUANTERA-24-1, and the Research Council of Finland (Decision No. 361115).