Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

NONLINEAR PROPERTIES OF SILVER NANOPARTICLES EXPLORED BY A FEMTOSECOND Z-SCAN TECHNIQUE
Aleksandr Alesenkov^a, Jurgis Pilipavičius^b, Aldona Beganskienė^b, Romualdas Sirutkaitis^c, and Valdas Sirutkaitis^a
^aLaser Research Center, Vilnius University, Saulėtekio 10, LT-10223 Vilnius, Lithuania
E-mail: aleksandr.alesenkov@ff.vu.lt
^bDepartment of Inorganic Chemistry, Vilnius University, Naugarduko 24, LT-03225 Vilnius, Lithuania
^cInstitute of Biochemistry, Vilnius University, Mokslininkų 12, LT-08662 Vilnius, Lithuania

Received 10 February 2015; revised 22 April 2015; accepted 15 June 2015

In this report we present results of linear and nonlinear optical properties of colloidal material consisting of triangle silver nanoparticles in distilled water. The nonlinear optical properties of the material were investigated by a Z-scan technique using femtosecond laser pulses with tunable wavelength. Nanoparticle suspension showed distinct spectra with absorption lines, emerging due to the plasmonic properties of the silver nanoparticles. Surface plasmon resonance peak change over a wide range of wavelengths from 400 to almost 1100 nm was observed when the size of silver nanoparticles varied from 20 to 150 nm. In the samples different nonlinear effects such as saturable absorption, two photon absorption and self-focusing were observed when the femtosecond pulse intensity was changed from 1 up to 100 GW/cm².

Keywords: Z-scan, silver nanoprism, two-photon absorption
PACS: 42.65.Jx

SIDABRO NANODALELIŲ OPTINIAI NETIESIŠKUMAI, IŠTIRTI NAUDOJANT Z SKENAVIMO METODIKĄ SU FEMTOSEKUNDINIAIS LAZERINIAIS IMPULSAIS

Aleksandr Alesenkov^a, Jurgis Pilipavičius^b, Aldona Beganskienė^b, Romualdas Sirutkaitis^c, Valdas Sirutkaitis^a
^aVilniaus universiteto Lazerinių tyrimų centras, Vilnius, Lietuva
^bVilniaus universiteto Neorganinės chemijos katedra, Vilnius, Lietuva
^cVilniaus universiteto Biochemijos institutas, Vilnius, Lietuva

Straipsnyje pristatomos nanokompozitinės medžiagos, susidedančios iš sidabro nanoprizmių, disperguotų distiliuotame vandenyje, tyrimų rezultatai. Suspensija buvo pagaminta dviejų žingsnių cheminiu procesu naudojant užkratą. Nanodalelių sugerties spektras parodė išreikštas plazmonines dalelių savybes. Didėjant prizmių kraštinei nuo 20 iki 150 nm, sugerties smailė slinko link ilgesnių bangos ilgių spektriniame diapazone tarp 400 ir 1100 nm. Žadinant nanodaleles didelio intensyvumo femtosekundiniais lazeriniais impulsais infraraudonojoje spektro dalyje (1200–1400 nm), medžiagoje buvo stebėti netiesiniai optiniai reiškiniai, pavyzdžiui, praskaidrėjimas, dvifotonė sugertis ir fokusavimas.

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