Determination of the two-photon absorption cross-section of magnetite and manganese ferrite nanoparticles in ferrofluids and thin films (Conference Presentation)

Daniel Espinosa; Eduardo S. Gonçalves; Antonio M. Figueiredo Neto

doi:10.1117/12.2250636

21 April 2017 Determination of the two-photon absorption cross-section of magnetite and manganese ferrite nanoparticles in ferrofluids and thin films (Conference Presentation)

Daniel Espinosa, Eduardo S. Gonçalves, Antonio M. Figueiredo Neto

Author Affiliations +

Proceedings Volume 10125, Emerging Liquid Crystal Technologies XII; 101250L (2017) https://doi.org/10.1117/12.2250636
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

Nonlinear optical properties of colloids have technological appeal, since nanoparticles with nonlinear optical properties can be combined with the fluidity of liquid carriers, in the emerging area of Optofluidics. Ferrofluids, especially, can be used in magnetically-controllable applications or in optical limiting devices, where nonlinear absorption is a key characteristic. Besides two-photon absorption, some phenomena are present in experimental studies in optical nonlinearities of colloids: the particles can absorb light and heat the liquid around it, giving rise to a temperature and a subsequent refractive index gradient, what originates a thermo-optical self-focusing; also, the temperature gradient can drive the particles inward or outward the illuminated region, what changes the refractive index and the absorption coefficient of the material. In this work, the z-scan technique is performed in ferrofluids and thin films made from ferrofluids to measure the two-photon absorption coefficient of magnetite and manganese ferrite nanoparticles and to determine their two-photon absorption cross-section (σ2PA). To avoid the influence of the cited thermo-optical effects in these measurements, the frequency of the pulsed Gaussian beam (pulse width of 196 fs) is decreased with an electro-optic modulator and a shutter is used to allow the measurement of the nonlinear effects, present at the first pulse illuminating the sample, after a period of 2 seconds without illumination. The z-scan curves with and without using shutter are compared in colloids and thin films. The achieved values of σ2PA at 800 nm are 50 GM and 107 GM, for the magnetite and manganese ferrite nanoparticles, respectively.

Conference Presentation

Citation Download Citation

Daniel Espinosa, Eduardo S. Gonçalves, and Antonio M. Figueiredo Neto "Determination of the two-photon absorption cross-section of magnetite and manganese ferrite nanoparticles in ferrofluids and thin films (Conference Presentation)", Proc. SPIE 10125, Emerging Liquid Crystal Technologies XII, 101250L (21 April 2017); https://doi.org/10.1117/12.2250636

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Absorption

Nanoparticles

Manganese

Thin films

Camera shutters

Liquids

Nonlinear optics

Show All Keywords

Keywords/Phrases

Search In:

Publication Years