Critical angles, of total internal reflection

The internal angle of incidence is generally chosen to be 20° so that it is close to the critical angle of total internal reflection. The infrared absorption of each of the monolayers is measured both with and without the metal layers. The ATR technique is used only over the frequency range for which the substrate is transparent. For silicon substrates, this limits the applicable frequency ranges to between 4000 and 1700 cm 1 and below 420 cm 1. 

Table 3.1 Critical angles of total Internal reflection and evanescent wave penetration depths...

The angle of incidence is e, as shown in Fig. 8. To obtain total internal reflection we must have e greater than the critical angle for total internal reflection, ec, which is given by... 

If the angle of incidence is greater than a critical angle 0 total internal reflection will occur rather than refraction, as shown in Fig. 16.176. This... 

A lead glass fibre has a refractive index of 1.682. What is the critical angle for total internal reflection at the interface with an acrylic coating with refractive index 1.498 ... 

Figure 10.6 Refraction (Snell s law) and (internal) reflection at a glass-air dielectric interface. The graph depicts the reflectivityforBK7-glassfor532 nm (0532 = 1.5195), forboth s-and p-polarization components. The locations of the Brewster angle 0B and the critical angle for total internal reflection 6c are indicated...

A few polymer chains chemically end labeled with a fluorescent probe (NBD) are mixed to the polymer melt (4). The sample is a drop of this mixture (optical index, 03), squeezed between a moving plate and the upper surface of a silica prism (optical index, ni > n2) which form the walls of a plane Couette cell. Two laser beams (wavelength in vacuum Xq) impinge on the prism surface at an incidence angle 0i greater than the critical angle for total internal reflection, 0c = sin (n2/ni). They both... 

Attenuated total reflection (ATR), also called internal reflection, is based on the phenomenon of total internal reflection. In ATR the infrared beam is directed into an infrared-transmitting crystal so that it strikes the crystal surface at less than the critical angle and undergoes total internal reflection. 

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