Optical response temperature dependence

The responsivity and g-r noise may be analyzed to obtain background photon flux and temperature dependence of responsivity, noise, and detectivity. Typically, n > p, and both ate determined by shallow impurity levels. The minority carrier density is the sum of thermal and optical contributions. 

The first photophysical investigation performed on stereochemically pure metal-based dendrimers having a metal complex as the core is that concerning the tetranuclear species based on a [Ru(tpphz)3]2+ core (tpphz=tetrapyrido[3,2-a 2, 3 -c 3",2"-h 2",3"j]phenazine) [67]. Dendrimer 45 is an example of this family. In this compound, two different types of MLCT excited states, coupled by a medium- and temperature-dependent photoinduced electron transfer, are responsible for the luminescence behavior. However, the properties of all the optical isomers of this family of compounds are very similar. This finding is also in... 

The temperature dependences of optical properties of organic conductors beyond the phase-transition region have not been investigated sufficiently so far. The quantitative temperature studies of the e-mv coupling are very difficult and possible only for some selected low-dimensional salts. It was shown [94,95] that an analysis of T dependence of the IR spectra of the salts composed of isolated dimers (TCNQ)2- makes it possible to pinpoint the main mechanisms responsible for thermal evolution of the IR spectra and changes in the absorption coefficients. Among other things it was... 

Anisotropic molecules show optically isotropic behavior in the bulk when they are disordered and randomly oriented, for instance in solutions or liquid crystal above the transition temperature. Under the influence of a strong beam, the induced dipole moment of the molecules feels a torque that tends to orient the molecule. The reorientation of the molecular dipoles induces a change in the refractive index. The typical values for molecular susceptibilities and the time-responses vary depending on the type of systems. For small anisotropic molecular systems, x 10 esu, with a time response 10 s. However, in the nematic phase, liquid crystal molecules are strongly correlated, resulting in much higher values, x 10 esu,... 

As already stated for other experimental parameters, two factors may account for the nonlinear optical response dependence on excitation wavelength Local field factor, f, and intrinsic nonlinear properties of the particles, x2 - The interband contribution to x2 expected to vary only for photon energies at least equal to the IB transition threshold, provided the intraband contribution remains negligible. On the other hand, the hot electron contribution, which accounts for the Fermi smearing mechanism, presents spectral variations for photon energies close to the IB transition threshold, since the electron distribution is modified around the Fermi level by the temperature increase subsequent to light absorption (see 3.2.3). The wavelength dependence of x has been already discussed in Section 6. 

Gao, L., Li, Z.-Y. Temperature dependence of nonlinear optical response in metal/dielectrics composite media. Sol. State Commun. 107, 751-755 (1998) Temperature dependence of nonlinear optical properties in metal/dielectric composites. Phys. Stat. Sol. (b) 218, 571-582 (2000)... 

Fig. 17 Temperature dependence of electro-optical response time for the polymer-stabilized blue phases (polymer fraction a = 6.3, 10.5, 15.0 mol %) in the rise process (A) and decay process (B) [46]...

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