Two-photon cross-section measurements using an optical chopper:<i>z</i>-scan and two-photon fluorescence schemes

Nag, Amit; De, Arijit K.; Goswami, Debabrata

doi:10.1088/0953-4075/42/6/065103

Cited by 43 publications

(46 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The thermal change of the refractive index induced by the preceding pulse can affect the measurement by the next pulse. Recently, it was shown that the third-order optical nonlinearities could be obtained by sufficiently minimizing the thermal effects from the high repetition lasers, by reducing the excitation laser pulses using an optical chopper [14][15][16]. When an optical chopper is used, its off-time windows provide sufficient time for thermal relaxation.…”

Section: Resultsmentioning

confidence: 99%

Nonlinear optical properties of Er3+/Yb3+-doped NaYF4 nanocrystals

Komarala¹,

Wang²

2010

Chemical Physics Letters

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

Nonlinear optical properties of Er3+/Yb3+-doped NaYF4 nanocrystals

Komarala¹,

Wang²

2010

Chemical Physics Letters

View full text Add to dashboard Cite

“…A focusing lens, with a focal length of 25 cm, is placed before the sample to focus the incident beam. The transmitted beam through the sample is measured using an open-aperture detector and the result is processed using known correlations (Equations 1 and 2) 54 in the literature to obtain the TPA cross-sections of the samples.…”

Section: Two-photon Absorption Measurementsmentioning

confidence: 99%

Effect of Acceptor Strength on Optical and Electronic Properties in Conjugated Polymers for Solar Applications

et al. 2015

View full text Add to dashboard Cite

Four new low-bandgap electron-accepting polymers-poly(4,10-bis(2-butyloctyl)-2-(2-(2-ethylhexyl)-1,1-dioxido-3-oxo-2,3-dihydrothieno[3,4-d]isothiazol-4-yl)thieno[2',3':5,6]pyrido[3,4-g]thieno[3,2-c]isoquinoline-5,11(4H,10H-dione) (PNSW); poly(4,10-bis(2-butyloctyl)-2-(5-(2-ethylhexyl)-4,6-dioxo-5,6-dihydro-4H-thieno[3,4-c]pyrrol-1-yl)thieno[2',3':5,6]pyrido[3,4-g]thieno[3,2-c]isoquinoline-5,11(4H,10H)-dione) (PNTPD); poly(5-(4,10-bis(2-butyloctyl)-5,11-dioxo-4,5,10,11-tetrahydrothieno[2',3':5,6]pyrido[3,4-g]thieno[3,2-c]isoquinolin-2-yl)-2,9-bis(2-decyldodecyl)anthra[2,1,9-def:6,5,10-d'e'f']diisoquinoline-1,3,8,10(2H,9H)-tetraone) (PNPDI); and poly(9,9-bis(2-butyloctyl)-9H-fluorene-bis((1,10:5,6)2-(5,6-dihydro-4H-cyclopenta[b]thiophene-4-ylidene)malonitrile)-2-(2,3-dihydrothieno[3,4-b][1,4]dioxine)) (PECN)-containing thieno[2',3':5',6']pyrido[3,4-g]thieno[3,2-c]isoquinoline-5,11(4H,10H)-dione and fluorenedicyclopentathiophene dimalononitrile, were investigated to probe their structure-function relationships for solar cell applications. PTB7 was also investigated for comparison with the new low-bandgap polymers. The steady-state, ultrafast dynamics and nonlinear optical properties of all the organic polymers were probed. All the polymers showed broad absorption in the visible region, with the absorption of PNPDI and PECN extending into the near-IR region. The polymers had HOMO levels ranging from -5.73 to -5.15 eV and low bandgaps of 1.47-2.45 eV. Fluorescence upconversion studies on the polymers showed long lifetimes of 1.6 and 2.4 ns for PNSW and PNTPD, respectively, while PNPDI and PECN showed very fast decays within 353 and 110 fs. PECN exhibited a very high two-photon absorption cross section. The electronic structure calculations of the repeating units of the polymers indicated the localization of the molecular orbitals in different co-monomers. As the difference between the electron affinities of the co-monomers in the repeating units decreases, the highest occupied and lowest unoccupied molecular orbitals become more distributed. All the measurements suggest that a large difference in the electron affinities of the co-monomers of the polymers contributes to the improvement of the photophysical properties necessary for highly efficient solar cell performance. PECN exhibited excellent photophysical properties, which makes it to be a good candidate for solar cell device applications.

show abstract

“…Laser pulse energy of 5.3 nJ/pulse has been used for this experiment with pulse width of 150 fs at 76 MHz. A mechanical chopper (MC1000 A, Thorlabs Inc.) at 50 % duty cycle was used to minimize the cumulative thermal effect from the train of pulses separated by 13.5 ns with an excitation wavelength of 780 nm to the sample [38]. Interferometric autocorrelation technique was used to measure the pulse width of laser pulses.…”

Section: Two-photon Induced Fluorescence Setupmentioning

confidence: 99%

Investigating Two-Photon-Induced Fluorescence in Rhodamine-6G in Presence of Cetyl-Trimethyl-Ammonium-Bromide

2016

Self Cite

View full text Add to dashboard Cite

We investigate the effect of cetyl-trimethyl-ammonium-bromides (CTAB) concentration on the fluorescence of Rhodamine-6G in water. This spectroscopic study of Rhodamine-6G in presence of CTAB was performed using two-photon-induced-fluorescence at 780 nm wavelength using high repetition rate femtosecond laser pulses. We report an increment of ∼10 % in the fluorescence in accordance with ∼12 % enhancement in the absorption intensity of the dye molecule around the critical micellar concentration. We discuss the possible mechanism for the enhancement in the two-photon fluorescence intensity and the importance of critical micellar concentration.

show abstract

Two-photon cross-section measurements using an optical chopper:z-scan and two-photon fluorescence schemes

Cited by 43 publications

References 19 publications

Nonlinear optical properties of Er3+/Yb3+-doped NaYF4 nanocrystals

Nonlinear optical properties of Er3+/Yb3+-doped NaYF4 nanocrystals

Effect of Acceptor Strength on Optical and Electronic Properties in Conjugated Polymers for Solar Applications

Investigating Two-Photon-Induced Fluorescence in Rhodamine-6G in Presence of Cetyl-Trimethyl-Ammonium-Bromide

Contact Info

Product

Resources

About