The nonlinear refractive index (n2) and two-photon absorption coefficient (β2), was determined for PbSe
nanocrystals (NCs) suspended in trichloroethylene (TCE) using a standard Z-scan technique with
femtosecond pulses over a range of wavelengths in the near-IR. For comparison, the n2 of PbS NCs in
chloroform was also measured. The exciton peaks of the NCs were tuned to telecommunications
wavelengths. The concentration of the solutions ranged from 4.5 mg/mL to 18.8 mg/mL.
KEYWORDS: Photonic crystals, Negative refraction, Waveguides, Near field optics, Near field scanning optical microscopy, Nanostructures, Finite-difference time-domain method, Near field, Switching, Photonic nanostructures
Recent important advances in subwavelength nanostructures offer extraordinary control over the properties of
light. We can now manipulate the propagation, storage, and generation of light, as well as practically
prescribe light-matter interaction based on first-principles. Photonic crystals, in particular, offer the unique
ability for arbitrary control of dispersion as well as ultrahigh quality factor (Q) and modal volume (Vm)
nanocavities. In this talk, we will present, to our knowledge, the first near-field experimental observations of
near-infrared subwavelength imaging in negative refraction photonic crystals, as well as discuss our efforts in
enhanced nonlinearities in photonic crystal nanocavities.
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