Wavelength

Consider the Friis' transmission equation $P_R = (P_T G_T G_R \lambda^2)/(4\pi D)^2$, where $P_R$ and $P_T$ are the received and the transmitted powers, respectively. $G_T$ and $G_...

Consider an LED based on a direct bandgap semiconductor material with energy bandgap 1.3 eV. Given: Plank's constant, h = 6.63 × 10^-34 J s and speed of light in free space is 3 ×...

A transparent dielectric coating is applied to glass ($\epsilon_r = 4, \mu_r = 1$) to eliminate the reflection of red light ($\lambda_0 = 0.75 \mu m$). The minimum thickness of the...

The quantum efficiency ($\eta$) and responsivity (R) at a wavelength $\lambda$ (in $\mu$m) in a p-i-n photodetector are related by

The electric field component of a plane wave traveling in a lossless dielectric medium is given by $$$\overrightarrow E \left( {z,t} \right) = {\widehat a_y}2\cos \left( {{{10}^8}t...

The cut-off wavelength (in µm) of light that can be used for intrinsic excitation of a semiconductor material of bandgap E g = 1.1 eV is ________.

Refractive index of glass is 1.5. Find the wavelength of a beam of light with a frequency of $${10^{14}}$$ Hz in glass. Assume velocity of light is $$3\,\, \times \,{10^8}$$ m/s in...

The depth of penetration of a wave in a lossy dielectric increases with increasing

The wavelength of a wave with propagation constant $$\left( {0.1\,\pi + j\,0.2\pi } \right){m^{ - 1}}$$ is