[PDF]    http://dx.doi.org/10.3952/lithjphys.47114

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 47, 31–35 (2007)


OPTICAL STARK EFFECT IN ORIENTED PSEUDOISOCYANINE J-AGGREGATES
R. Gadonas, A. Čiburys, and A. Savickas
Department of Quantum Electronics and Laser Research Centre, Vilnius University, Saulėtekio 9, LT-10222 Vilnius, Lithuania
E-mail: roaldas.gadonas@ff.vu.lt

Received 5 March 2007

The optical Stark effect (OSE) has been studied in highly oriented J-aggregates of 1,1’-diethyl-2,2’-cyanine chloride (PICCl) in vertically spin-coated PVA film under far off-resonance pump by 1 ps pulses at 1055 nm. Blue shift of few tens of cm–1, bleaching, and broadening of the J-band were observed. The induced changes in absorption showed instantaneous character of OSE. Polarization dependence observed is qualitatively explained supposing the dual nature of the J-band. Observed Stark shift of nearly the same magnitude in dye monomer solution indicates no exciton enhancement of the aggregate OSE response induced by far off-resonance light pulses.
Keywords: J-aggregates, optical Stark effect, OSE
PACS: 42.50.Hz, 78.67.-n


OPTINIS ŠTARKO EFEKTAS ORIENTUOTUOSE PSEUDOIZOCIANINO J AGREGATUOSE
R. Gadonas, A. Čiburys, A. Savickas
Vilniaus universitetas, Vilnius, Lietuva

Darbe tiriamas optinis Štarko efektas (OŠE) stipriai orientuotuose 1,1’-dietil-2,2’-cianino chlorido (PIC-Cl) J agregatuose, įterptuose į PVA plėvelę, esant nerezonansiniam (nederinimas 8000 cm–1) impulsiniam (1 ps trukmės) žadinimui. Stebimi OŠE sukelti sugerties pokyčiai yra kelių cm–1 dydžio J juostos mėlynasis poslinkis, juostos blyškimas ir plitimas. Eksperimento sąlygomis sugerties pokyčiai buvo momentinio pobūdžio. Stebima poliarizacinė priklausomybė kokybiškai paaiškinta nevienalyčiu J juostos pobūdžiu. Panašaus dydžio Štarko poslinkis dažų monomeriniame tirpale ir agregatuose liudija apie neeksitoninės prigimties OŠE atsaką J agregatuose didelio žadinimo nederinimo sąlygomis.


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