Optical second-harmonic generation (SHG) can only occur in noncentrosymmetric crystals in the leading electric-dipole approximation. Transition metal dichalco genides with the 1T octahedral coordination is cent
This can occur in transmission or reflection geometries, and the polarization of the incident and SHG light can each be, in general, elliptical with the special cases of linear and circular polarizations; these polarization states can further be either rotated or fixed. Figure 1a and d depict ...
Second harmonic generation (SHG), also called frequency doubling, is a nonlinear optical process, in which photons interacting with a nonlinear material are effectively ‘combined’ to form new photons having twice the frequency of initial photons. ...
However, myosin and collagen probably occur in millimolar abundance, whereas cellular membranes can only be stained in the 1–10 μM level to avoid aggregation and toxicity. Thus the quadratic dependence of the second-harmonic signals on concentration leads to unexpectantly intense images from ...
Jose A Jaramillo-Villegas2,6, Pei-Hsun Wang2, Daniel E Leaird2, Miro Erkintalo3, Minghao Qi2,5 and Andrew M Weiner2,5 Simultaneous Kerr comb formation and second-harmonic generation with on-chip microresonators can greatly facilitate comb self-referencing for optical clocks and frequency metr...
Methods: For this investigation we use Second Harmonic Generation (SHG) imaging microcopy to study changes in the structure of the ovarian ECM in human normal and malignant ex vivo biopsies. This method directly visualizes the type I collagen in the ECM and provides quantitative metrics of the ...
Simultaneous Kerr comb formation and second-harmonic generation with on-chip microresonators can greatly facilitate comb self-referencing for optical clocks and frequency metrology. Moreover, the presence of both second- and third-order nonlinearities re
The experimental findings on the second harmonic generation (SHG) in centrosymmetric crystal silicon are reported. The SHG is induced by extremely high electric field (up to 15 MV/cm) parallel to the crystal surface of a short terahertz (THz) pulse wh
Figure 4d shows multiple sideband oscillations that occur at a pump power of 930 μW. Particular signal-idler pairs oscillate as a function of pump laser detuning as expected from Eq. (5). Disorder in the mode spacing and quality factors causes certain mode pairs to oscillate before others...
it is appreciated that increased conversion efficiencies occur from any apportionment of total organic layer unit thickness between the two L-B layer units. Significant improvements in conversion efficiencies can occur with the thickness of either L-B layer unit ranging up to 90 percent of the total...