Hari Krishna

6 Questions 7 Answers 0 Followers

Questions related from Hari Krishna

How the phase of lobes in Hermite-Gaussian Beams are pi shifted from each neighbor?

Considering a Hermite-Gaussian (HG) Beam as a perfectly plane wave and ignoring the phase due to curvature(exp(ik(x^2+y^2/2R)), the phase of lobes is pi phase shifted from its neighbor. When we...

01 May 2017 4,517 5 View

Does cropping an Image change its pixel value?

if a full image is cropped to some extent, leaving the unwanted area, does the pixel color value change? does it remain same before and after cropping or any changes takes place in pixel value? If...

07 June 2016 3,283 15 View

How can one customize "colormap" in matlab?

In an image I have to set colormap as gray, and I need the min color to be white and max color to be gray. by default min color is black and max color is white. How can I customize this using a...

16 March 2015 4,168 6 View

In 1D FDTD, is it necessary to have same material at both ends of the grid?

in order to implement 1D FDTD without error we should consider Perfect magnetic conductor(PMC) at the beginning of the grid and perfect electric conductor (PEC) at the end of the grid.but...

31 December 2014 5,695 4 View

What is the field distribution of a TE or TM mode propagation?

TE modes have no electric field in the direction of propagation and the TM mode has no magnetic field in the direction of propagation. Generally, the field should be perpendicular to the direction...

15 November 2014 8,038 3 View

What happens to photonic band gap after introducing a defect?

In case of semi conductors the bandgap shrinks due to excess doping. Is the same applicable to photonic bandgap as well? or either it shrink or expand? please explain.

02 November 2014 6,515 2 View