What are the reasons on transmittance drop at wavelength range (1160-1300 nm) of chalcogenide thin film? what do you think? documented references are appreciated.
Hi Prof. Eldenglawey
More details (about what is the used material?, structure, is it thin film?) are appreciated to make it clearer.
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Dear colleague prof .Dr. @Mostafa A. El-Aasser
Have a nice time and good day.
The presented material is amorphous chalcogenide thin film
Dear colleague prof. Dr. @ Eldenglawey
I expect that you have amorphous metal dichalcogenide thin film. Don't you?
Dear colleague prof. Dr. @ Eldenglawey
As far as I understood from the question and given information, I would say that this fall in the transmission spectrum means absorption or reflection at this wavelength.
Providing the presence of random metal nanoparticles distributed in the amorphous host, this could be attributed to a resonant excitation occurring at the interfaces of metal/dielectric nanostructures.
This resonance excitation is called localized surface plasmon polariton resonance (LSPPR). LSPPR minimum position (wavelength) and its broadening profile depend on the size and shape of the metal nanoparticles. It also depends on the host material around the nanoparticles. A red shift for the minimum position occurs if the nanoparticle size increases and similarly a blue shift occurs in case of nanoparticle size reduction. LSPPR resonance wavelength does not change significantly if the thin film thickness changed. LSPPR strength (dip) depends on the density of nanoparticle or distribution.
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