1. ### The maximum intensity for light transmitted through a thin film

Homework Statement A thin (460 nm) film of kerosene (n=1,20) is spread out on water (n = 1,30). Light hits the (horizontal) surface of the film coming (almost) perpendicularly from above. A diver underwater, below the film. a) Find out the visible wavelength reflected into air that has the...
2. ### A To capture the infrared light

hello : i have a small question , can we use multi layer thin films to increase absorption of infrared spectrum , on certain surface , ? taking in mind that we use the same kind of thin film for each layer . is that possible ? best hagop
3. ### I Fuchs-Sondheimer Resistivity model for Nanowires

I calculated FS Model using Mathcad and I got that this part increases with decreasing width $\w$. This make the resistivity increases with decreasing width $\w$. This contradict the result of this model. Has anyone ever come across with this before? the original paper...
4. ### Material Science background if I would like to pursue a postgraduate research in Thin Films

Is it advisable to have a Material Science background if I would like to pursue a postgraduate research studies in advanced thin film technologies?
5. ### Thin film interference

Homework Statement Between two pieces of glass (##n_1=1.70##), there is a thin film of water (##n_2=1.33## and width ##d=1 \mu m##). If there is normal-incidence of white light on the water surface, find: (a) which wavelenghts can be seen in the light transmitted (answer: 667 nm,533 nm,444 nm...
6. A

### Newton's Rings and Thin Film Interference

Homework Statement A total of 31 bright and 31 dark Newton's rings (not counting the dark spot at the center) are observed when 550-nm light falls normally on a planoconvex lens resting on a flat glass surface. How much thicker is the center than the edges? Homework Equations 2t = mλ 2t =...
7. ### I Diameter of nanoparticles formed by dewetting of thin film

Hi, I'm trying to understand the derivation to an equation I found in the following paper: http://pubs.acs.org/doi/abs/10.1021/nn203035x I posted almost this exact question on Physics Stack Exchange but got no replies so I decided to try it here instead, I hope that's ok...
8. ### Finding the ratio of thicknesses of films (destructive)

Homework Statement I need help on figuring out part C which is determining the ratio between ##t_1## and ##t_2## in order to get constructive interference. I'm given the index of refractions ##n_1=1.5## and ##n_2=2## and that I know that wave 1 and 2 have half cycle shift and wave 3 does not...
9. ### Interference of thin films

Homework Statement (a) Calculate the minimum thickness of a soap bubble film that results in constructive interference in the reflected light if the film is illuminated with light whose wavelength in free space is λ=600nm. The index of refraction of the soap film is 1.33. (b) What is the film...
10. ### Questions on Rs measurement by four point probe device

Hi all, I am working on electronics material (using metal oxide as an active layer in TFTs). Currently, I'm trying to measure the sheet resistance (Rs) of CuO thin film (~100nm in thickness). My lab uses Agilent B1500 device for measuring the Rs. I met some problems when carrying out the...
11. ### Switchable Porosity

Is it possible to switch the porosity of any microporous material by external stimuli (eg. optical, pressure or electrical ). I'm trying to imagine something akin to an "Artificial Stomata" where the pore opening & closing Can be externally controlled. I'd be very thankful if someone could...
12. ### Thin film interference reflection

Homework Statement A coating of n1 = 1.27 material is to be added to n2 = 1.50 glass, in order to make it "irridescent." a) What is the thinnest layer of material which will have a reflection maximum for normal-incidence light at BOTH 400 and 600 nm (vacuum) wavelength? b) This thickness will...
13. ### Help with two multiple choice questions related to light and interference

Homework Statement A thin film of glass is in flush contact with a thin film of transparent plastic that has a higher index of refraction than the glass. Monochromatic light of a certain frequency is shown on both sides of this combination, and there is very little light reflected from either...
14. ### Thin film / interference question

Homework Statement Monochromatic laser light is shown through a double-slit apparatus with a slit separation of onto a screen, but no interference pattern is seen because the thin transparent coating (index of refraction n=1.35) on the screen is creating a thin-film destructive interference...