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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.
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.
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.
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.
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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