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An investigation of Ir(III) complexes has been performed using double-pump probe (DPP) experiments to decouple the triplet quantum yield and triplet cross-section of these complexes. Both femtosecond and picosecond DPP measurements are presented.
Using Beam-Deflection measurements we directly measure the temporal dynamics of nonlinear refraction and transmittance of an ITO thin film in the ε-near-zero regime, and find a nonlinear index 5000 times that of glass.
We recently demonstrated orders of magnitude enhancement of two-photon absorption (2PA) in direct gap semiconductors due to intermediate state resonance enhancement for photons of very different energies. It can be expected that further enhancement of nondegenerate 2PA will be observed in quantum wells (QWs), since the intraband matrix elements do not vanish near the band center, as they do in the...
We demonstrate a scanning 3-D IR imaging technique using extremely nondegenerate two-photon absorption in an uncooled GaN photodiode, and obtain ∼2 μm depth resolution at a wavelength of ∼5 μm in buried semiconductor structures.
We observe large enhancement of nondegenerate two-photon absorption compared to the degenerate case. We use this to sensitively detect and image mid-IR light with simple uncooled photodiodes. The enhancement also applies to 2-photon emission and gain.
We detect both pulsed and CW IR light using uncooled GaN or GaAs photodiodes using extremely-nondegenerate two-photon-absorption (2PA) which shows large enhancement over degenerate 2PA. Urbach-tail absorption limits the signal-to-noise ratio for CW detection.
We compare GaAs and GaN for IR detection using extremely non-degenerate two-photon absorption. While the small gap material has larger ND-2PA and hence better sensitivity to IR, unwanted background from degenerate 2PA outweighs this advantage.
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