The Head of the Laboratory

Doc. Sci., Prof. Gertruda V. Klimusheva. tel. +38 (044) 525 78 41 email

Main fellows

Major research areas

Solid state physics: spectroscopy, optics and x-ray analysis of molecular and liquid crystals.

Significant results

• In the field of spectroscopy of molecules and crystals: the technique for determination of energy and spatial structure of multi-atomic molecules by means of measuring of the low-temperature electronic absorption spectra of crystals in polarized light was elaborated. This method was used for investigation of molecules of wide range of benzene derivatives as described in [1].
• In the field of physics of excitones: the specific spectral peculiarities of crystals possessing spatial dispersion were found (deviation from Lambert-Bouger law, anomalous dependencies of absorption bands on the thickness and temperature) [2].
• Conjugated states of triplet excitones were found. They appeared to be determined by the static dipole-dipole interaction at the high intensity of pumping light and resulted in the change of main spectral and kinetic characteristics [3].
• In the field of spectroscopy and optics of liquid crystals: the optical bistability and dynamic holography gratings in dye-doped nematic chiral liquid crystals were obtained for the first time. The writing time is ~ 10 ns and diffraction efficiency ~ 10 - 12 % [4, 5].
• X-ray investigation of the arrangement of metal-containing molecules in liquid crystalline phases was fulfilled [6]. Small-angle x-ray investigations of mesogenic matrices in different temperature intervals and of chiral agent as separate system were made [7].
• Optical activity and self-diffraction under external factor influence in dye-doped chiral and ionic liquid crystals [8,9].
• The narrow-band visible spectral range colour filters based on chiral liquid crystalline materials were designed, as well as two-colour information display governed by electrically controlled twist cell.

Major publications

1. V.L.Broude, G.V.Klimusheva, A.F.Prikhotko et al., "Absorption spectra of molecular crystals", Vol.1, "Naukova Dumka", Kiev, 1965; Vol.2, "Naukova Dumka", Kiev, 1972 (In Russian).
2. A.A.Delyukov, G.V.Klimusheva "Anomalous dependence of light absorption by crystals of n-dichlorine- and n-dibrominebenzenes upon varying thickness and temperature", Fizika Tverdogo Tela, vol.16, No 11 (1974) 1874.
3. A.A.Delyukov, G.V.Klimusheva, A.V.Turchin, "Self-suppressing of exciton-exciton annihilation in a dense system of molecular excitones", Pis'ma v Zhurn.Eksper.Teor.Fiz., vol. 44, No 5, (1986) 255-257 (In Russian).
4. Zagainova L.I., Iljin A.G., Klimusheva G.V., Kukhtarev N.V., Vector selfdiffraction in doped induced cholesterics, Pis'ma v Zhurn. tekhn. fiz. (in Russian), vol.17, No 21, (1991) 61-65.
5. H.J.Eichler, D.Grebe, R.Macdonald, A.G.Iljin, G.V.Klimusheva, L.I.Zagainova, "Transient grating optical nonlinearities of dye-doped cholesteric liquid crystals", Opt.Mat., vol.2, (1993) 201-208.
6. A.P.Polishchuk, T.V.Timofeeva, Uspekhi Khimii, vol. 62, No 4 (1993) 319-350.
7. L.A.Kutulya, G.P.Semenkova, N.L.Kramarenko, V.I.Kulishov, L.D.Patsenker, A.S.Tolochko, L.A.Batrachenko, "New chiral imines - potential components of liquid crystal materials for electronic- and thermography", Functional Materials, vol. 1, 1 (1994) 128-143.
8. Klimusheva G.V., Iljin A.G., L.P.Yatsenko, Vakhnin A.Yu. External factor influence on the optical activity of chiral liquid crystals, Proc.SPIE v.2795, (1996) 50-55.
9. Klimusheva G.V., Kulishov V.I., Polishchuk A.P., Investigation of structure and nonlinear optical properties of the chiral and ionic liquid crystals, Ukr. Fiz. Zhurnal, vol. 44 (1999) 80-85.