27 GHz; in this case, localization is around the selleckchem defect layer
and not inside it. In Figure 4c, as Figure 4b, the localization is around the defect layer and not inside it, because this corresponds to the second mode of sample 3. Calculations for sample 3 for the peak at 1.46 GHz appears in Figure 4d, as can be seen, localization of the displacement field is not observed. Figure 4 Time evolution of acoustic Gaussian pulses. Calculations of l n(u(z,t)) for acoustic Gaussian pulses centered at the frequency f 0 indicated in each figure and σ=200 MHz for all cases. (a,b) Sample 2. (c,d) Sample 3. Zero in x-axis is placed at the surface of the PS sample. In order to estimate the displacement field intensity u(z,t)2, within the defect layer as a function to the time, we integrate the displacement field on Hormones inhibitor the defect JNK-IN-8 nmr layer using, (10) where Φ(t) is the displacement field intensity contained in the defect as a function of the time. Figure 5a shows Φ(t) for sample
2 for two Gaussian pulses centered in the frequencies f 0 indicated there, as expected the first mode has higher displacement field intensity in the defect layer because the acoustic wave is localized in the center of the PS structure, on the contrary to the second mode, see Figure 5a. In the case of sample 3, the localization is less than sample 2 for the two Gaussian pulses considered, that is, the Φ(t) amplitude for sample 2, see Figure 5b, in the first mode is around 30 times more the Φ(t) amplitude in sample 3 for one incident Gaussian pulse with frequency equal
to 1.15 GHz. Finally, localization is not observed in sample 3 Protein tyrosine phosphatase for a Gaussian pulse with a frequency of 1.46 GHz, as is expected, see Figure 5b. Figure 5 Displacement field intensity as a function of time. Theoretical calculations for the displacement field intensity u(z,t)2 in the defect as a function of time for (a) sample 2 and (b) sample 3, for frequencies indicated in each figure. The modeled transmittance of the periodic case (sample 1) and for the two cavity structures (samples 2 and 3), obtained by the TMM, shows a good match with the experimental results. The localized acoustic resonances can be tuned at different frequencies (within the acoustic band gap) by changing the porosity of the defect layer. Moreover, for commercial acoustic mirrors which are components of solidly mounted resonators and filters , a low-acoustic-impedance material such as SiO 2 is layered with high-impedance materials such as tungsten or molybdenum. Following Equation 8, for the layer pair of molybdenum and silica, where acoustic impedances are 66.2 MRayl and 13.1 MRayl, respectively, the fixed impedance ratio is 5.1, and the same impedance ratio can be obtained using PS layers of 30 % and 75 %, so, by modulating the porosity, very high reflectivity values can be achieved.