Shamsul Arafin

6 Questions 22 Answers 0 Followers

Questions related from Shamsul Arafin

How can the reflectivity spectrum of Bragg grating be measured experimentally in DBR/DFB lasers?

It is well-known that distributed feedback (DFB) and distributed Bragg reflector (DBR) lasers include gratings along their waveguides to provide wavelength selective...

08 August 2015 1,384 6 View

What is the meaning of my Theta-2 theta scan in XRD measurements for Heteroepitaxial growth of GaAs thin films on silicon?

To evaluate the material quality, I have measured the XRD of my as-grown structures by performing theta-2theta (TTH) scan which exhibits poly-crystallinity as shown in the attached file. I have...

05 August 2014 2,843 53 View

Can someone provide me any references that report the A2/A1 ratio for time-resolved PL data for InGaAs/GaAs quantum wells ?

Can someone provide me any references which report the relative magnitude of the slow decaying component to fast decaying component A2/A1 in a biexponential decay function of the time-resolved...

02 June 2014 5,585 3 View

How much is the terrace width (w) in graphene films mechanically exfoliated from HOPG?

I would like to use graphene film as a substrate material lying on SiO2/Si. For predicting the growth mode, I would need to know the width of atomically flat terrace. As it is known, the substrate...

18 December 2013 3,335 1 View

What is the difference between 2theta scan and 2theta/omega-scan in XRD measurements?

As we know, there are different scanning modes like 2theta scan (scanning of the diffracted beam) and 2theta/omega (scanning of the incident and diffracted beam). My question is what additional...

27 November 2013 6,310 9 View

Etch pit density measurement using molten KOH?

Does anyone have experience with it? I would like to know what is meant by molten KOH? Is it different from KOH solution? In particular, I would like to determine the etch pit density of my...

29 August 2013 3,613 4 View