5 ESSENTIAL ELEMENTS FOR INFRARED OPTICAL

 5a]. The absorption edge for samples VT400 and VT700 happened at ~ 503 nm and ~ 470 nm. Alternatively, the transmittance lowered a bit with growing substrate temperature from the NIR spectra vary, which could be attributed to the large particle size and lack of porosity for VT700. Figure 5b displays the reflectance spectra for each sam