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Molecular orientation and photoswitching kinetics on single-walled carbon nanotubes by optical second harmonic generation
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10.1063/1.4772786
/content/aip/journal/apl/101/26/10.1063/1.4772786
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/26/10.1063/1.4772786
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

A depiction of SHG by (a) trans- and (b) cis-DR1-P on SWNT, and (c) the geometry of measurements to define θ, φ, and ψ where substrate is indicated by xy plane. Fundamental wave is on yz plane of incidence.

Image of FIG. 2.
FIG. 2.

Experimental setup for measurement of SHG: GF, green filter; M, 10% partially reflecting mirror; λ/2, 1064 nm half-wave plate; RS, rotating sample stage; DM, dichroic mirror; Z-QR, z-cut quartz reference; ND, neutral density filter; BP, 532 nm bandpass filter; PD, photodetector for trigger; BSC, polarizing beamsplitter cube; PMT, photomultiplier tube; Box Car, 2-channel box car integrator; LED, unpolarized fiber-coupled LED.

Image of FIG. 3.
FIG. 3.

Transmitted 532 nm (p-polarized) SHG vs. angle of incidence for DR1-P/SWNT using p-polarized (circles) and s-polarized (squares) incident fundamental. Solid lines are theoretical fits.

Image of FIG. 4.
FIG. 4.

Plot of transmitted 532 nm (p-polarized) second harmonic intensity vs. time for DR1-P/SWNT under periodic 495 nm (blue trace) and 710 nm (red trace) illuminations. Inset shows normalized SHG signal level following the removal of 495 nm LED in an identical experiment, except that LED on-time is increased to 5 min. Green curve is the fit with the exponential equation.

Image of FIG. 5.
FIG. 5.

Plot of transmitted 532 nm (p-polarized) second harmonic intensity vs. time for DR1-P/SWNT under periodic 495 nm illumination (blue trace) and constant applied field (orange highlighted region) normal to substrate. Green curve is the fit with the exponential equation.

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/content/aip/journal/apl/101/26/10.1063/1.4772786
2012-12-26
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Molecular orientation and photoswitching kinetics on single-walled carbon nanotubes by optical second harmonic generation
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/26/10.1063/1.4772786
10.1063/1.4772786
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