Film Definition and 346 Threads

Which do you believe is the best choice for a low temperature RF heating susceptor, i.e. - greatest rise in temperature vs. field strength. I am aware that Graphite (expanded graphite foil) has excellent thermal conductance in plane and therefore makes for very even heating patterns over large...

Hi, I actually have two questions that are somewhat related so I am including them in one post. I add much more detail about the system then probably necessary because I'd like to see if I have a correct understanding of how the system works in addition to the question itself. Please bear with...

I want to deposit a layer of indium with a thickness of 10-100 microns on a metal bar. What would be cheap method for prototyping this? I am considering either soldering the indium and then flattening it or using an electron evaporator beam. Any other suggestions?

Hi, i am wondering how do you calculate the minimum film thickness between two plates, one smooth surface and another surface with a square microasperity. i am just very confused as to how do you determine the film thickness in between them. I have attached a paper which has a graph on...

A little "magic" trick with polarized film DO try this at home! I took three pieces of polarized film (which I salvaged from a pair of 3-D glasses). First I put two pieces together (A and B), one rotated at 90 degrees to the other. This effectively blocks out almost all the light. Then, I took...

Homework Statement So if light travels from vacuum to oil to water (1 -> 1.4 -> 1.33) how do you know if there is a constructive or destructive interference? Homework Equations The Attempt at a Solution I know that when it goes from air to the oil there is a phase shift of 1/2...

Hello everyone. My task is to select a thin film and deposition method that will achieve a few goals. The thin film will be sandwitched between a diamond and nickel alloy. The thin film needs to: Adhere to a diamond and nickel alloy strongly without inter diffusion. Stay together up...

In optoelectronics and other nanotechnology applications (like organic photovoltaics, organic LEDs etc) most layers need to be electrically characterized among other types of measurements. Thus, sheet resistance is measured. An example are the 4-point-probe resistivity measurements. Yet, what...

Homework Statement In optics, the following expression needs to be evaluated in calculating the intensity of light transmitted through a film after multiple reflections at the surfaces of the film: {\sum _{ n=0 }^{ \infty }{ { r }^{ 2n } } cos\quad n\theta })^{ 2 }+{ \sum _{ n=0 }^{ \infty...

Homework Statement Consider steady, incompressible, parallel, laminar flow of a film of oil falling down an infinite vertical wall (Figure P-1). The oil film thickness is “h” and gravity acts in the negative Z-direction (downward on the figure). There is no applied pressure driving the flow –...

When you film something using the microphone on the camera or an external microphone, is there always that hissing sound that you have to remove by running the video through a high pass or low pass filter? Or does it depend on the quality of the microphone? I have a pretty cheap microphone, and...

Guys, do you know any comprehensive website or reference that explains everything about soap film analogy and sand heap analogy? Including their concepts, procedure on how to perform them and some animations. It will be more useful if the discussion also deals with the reinforced concrete...

Homework Statement Light of wavelength 550 nm in air is normally incident on a glass plate (n=1.5) whose thickness is 1.1 X 10^-5 m. (a) What is the thickness of the glass expressed in terms of the wavelength of light in glass?(b) How many reflected waves will experience the 180 degree phase...

Homework Statement Plan plates of glass are in contact along one side and held apart by a wire 0.05 mm in diameter, parallel to the edge in contact and 20 cm distant. Using filtered green mercury light (λ = 546 nm), directed normally on the air film between plates, interference fringes are...

Homework Statement You are coating a glass lens of index of refraction 1.6 with a film of material of index of refraction 1.7. You start with the thinnest film possible that creates a strong reflection for 610 nm light. You gradually increase the film thickness until you again get strong...

So far I have the camera and the external microphone, but I realized that I'm probably going to need some light. I want to get some handheld light source that can provide white light (not the ugly yellow light a lot of bulbs produce). Any ideas on some keywords I could search for on Ebay or...

I have the XRD image of a PZT thin film. While trying to analyze it with JADE software I can not find the proper space group.So it is not giving me the answer I am looking for. I assumed the crystal system to be cubic.

Hi Everyone, I am currently doing my final year in B.Tech Engineering Physics. During these 3 years studying this course, I understood that learning Engineering was never the intent of this course in my college.. Faculty were stuffing us with Pure Physics with Applied or Engineering Physics...

1. A thin film of oil (no = 1.50) with varying thickness floats on water (nw = 1.33). When it is illuminated from above by white light, the reflected colors are as shown in the figure. In air, the wavelength of yellow light is 580 nm. a. Why are there no reflected colors at point A? b. What is...

When we dip a wire ring in a soap solution and then take it out, why does it form a soap film inside? Is there any explanation behind it?

Homework Statement A broad beam of light, of wavelength 683nm is sent directly down through the top plate of a pair of glass plates. The plates are 120mm long, touch at the left end and are separated by a wire of a diameter .048mm at the right end. Air between the plates act as a thin film...

Trying to get my head around constructive/destructive interference in thin film optics. The book does a good job of throwing formulas at you but I want some intuition. If we shine a laser with λ = 600 nm on a thin film of a material with refractive index 1.5, at what thicknesses will we get...

Hi everyone, I need a coating material for an moving object. The coating surface slide over another surface. The coating needs to be transparent to allow optics tracking, and flexible like paper because inner object is flexible, and it needs to be wear resistant to keep the transparent...

How do i demonstrate thin film interference with microscope slides? Textbook questions all mention that you will get parallel fringes when you put a hair between two microscope slides. However, i have tried doing so, but don't get the parallel fringes. I used a red laser pointer, and a...

Dear all fellow physicists, I am struggling with the following fluid mechanics problem: considering a liquid film in an "equilibrium" position between two plane walls, I am trying to define the forces acting on the liquid. Most importantly, gravity is pulling down on the liquid with Fg = m* g...

Homework Statement A lens (##\mu##=1.5) is coated with a thin film of refractive index 1.2 in order to reduce the reflection from the surface at ##\lambda=480 nm##. Find the minimum thickness of the film which will minimize the intensity of reflected. [Assume near normal incidence]Homework...

I'm working for the Company that specialize in thin film polyethylene. I research the tendency of using biodegradable thin film for packaging, Anyone that have knowledge or information about this such as report of the kinds of polymer used in that field. Please give me a help. thanks a lot

Thin Film Interference Problem: A hair is placed at the edge... Homework Statement Thin Film Interference Problem: A hair is placed at the edge between two 10.0 cm glass plates of n= 1.52. Light of 400 nm wavelength shines on the glass and an interference pattern is formed. If the...

Hello, I want to ask how can one calculate the thickness of a thin film (or each of the thin films in a stack of 3-4 thin films on one another) when - complex refractive index of each thin film is known (n and k). This refractive index is obtained from a single wavelength ellipsometer and...

Homework Statement Light strikes two plane sheets of glass with a thin air space between them as shown. If the light has a wavelength of 580 nm and the air space between the glass has a thickness of 870 nm, predict whether the reflected light as demonstrated by rays A and B will cancel or...

Homework Statement When a thin soap film is very thin, we see it as black. How thick (in nm) is the film in the region where we see the first red band? Take the wavelength of red light to be 752 nm and the index of refraction of the soap to be n = 1.33. Homework Equations [2nt/λ] - 1/2...

I have three temperatures (temperature of the fluid going in, temperature going out, and the temperature of the surface of the tube). What I'm trying to figure out is the film temperature at which I should evaluate the flow properties. The film temperature is defined as T,f = (T,s +...

Homework Statement A scientist notices that an oil slick floating on water when viewed from above has many different rainbow colors reflecting off the surface. She aims a spectrometer at a particular spot and measures the wavelength to be 750 {\rm nm} (in air). The index of refraction of...

Hello ! Firstly, i'd like to say that I have nothing to do with physics - and everything I've learned in school - has been forgotten and I really hope you can help me with a small problem I have .. I bought a roll of clear plastic film (100 m) one like this...

How terrifying! I've always been a bit nervous of the blackness of the see and now there are confirmed monsters in it! http://www.cbsnews.com/8301-205_162-57562424/giant-squid-filmed-alive-in-deep-sea-for-first-time/

How does the efficiency of a Thin Film solar cell compare to the efficiency of a single crystal solar cell with reference to the 5 main solar cell parameters ( Iopt , Rs, Rsh, Is and n )? I know series resistance( Rs ) will probably increase in thin film cells because of grain boundaries...

I have been reading recently on the properties of evaporated thin film bismuth, particularly grain size and resistivity. Usually evaporated bismuth is amorphous and semimetallic, with very small grain size. Grain size can be increased and resistance lowered by annealing the film. It has been...

Homework Statement White light is sent downward onto a horizontal thin film that is sandwiched between two materials. The indexes of refraction are 1.80 for the top material, 1.68 for the thin film, and 1.50 for the bottom material. The film thickness is 5.24*10^-7 m. (a) Of the visible...

Hi all, I'm studying for the GRE test and I have noticed that sometimes questions about thin film appear. Is there any reference where I can learn some basical knowledge about thin film reflection and refraction? I'm not looking for something deep. Just a general overview. Thanks

Black hole drive in the film "Event Horizon" Cheesy movie, right? A lot of fun though. For those who don't know, there is a starship in the film called the Event Horizon, which utilizes an artificial black hole drive/engine in order to allow it to fold space, although it's probably more...

Hi guys. I am new to this forum and need some help in solving some problems. My company produce thin film heater( doped tin oxide deposited on a substrate such as glass ceramic, beryllium oxide, aluminium nitride or alumina and some others). I need a formula for calculating within a few degrees...

It is said that a soap film will find the surface with the minimum area. If the two interfaces between the soap and the air meet, the soap film can effectively reduce its area by bursting. You would think that if you simply hold a soap film up vertically, all the liquid would want to go to the...

It is said that digital dental x-ray has less radiation. Is it because the sensor used that acts faster in capturing the image. What if you use a traditional film on a digital dental x-ray. Would the radiation be the same?

I'm trying to estimate the heat transfer coefficient from the surface of a hot object moving through open air. After much searching, all I can find is coefficients for sundry fluids confined within the tubes of heat exchangers. I'm trying to calculate for a body at between 300-460K moving at...

I am a writer for a newly forged independent film studio. We've managed to drum up some (surprisingly) considerable funding and support from our local community, and along with that we have been allowed access to an observatory and astrophysics department on a nearby college campus. We've...

A scientist notices that an oil slick floating on water when viewed from above has many different rainbow colors reflecting off of the surface. She aims a spectrometer at a particular spot, and measures the wavelength to be 750 nanometers (in air). The index of refraction of water is 1.33 The...

I recently saw this: http://arstechnica.com/science/2012/01/size-matters-when-things-are-just-right-water-flows-freely/ and was wondering whether it could be used on an airship to keep helium in the envelope (it often dissipates out). Since graphene is just a 2d version of graphite, would...

Hello, I'm reading something about adsorbate induced surface resistivity changes in thin metal films and there is often mentioning of electron-hole pair damping, as for example: "electron-hole pair damping of the parallel(to the surface of thin film) frustrated vibration of the...

Thin film diffraction -- need help to start Homework Statement I attached a picture of the problem, could anyone tell how I would begin to proceed with this problem? I believe that it is more complicated than simply a Snell's law problem, due to the thin film of oil. Thanks for your...

Homework Statement 33. This experiment projects a red laser light beam of wavelength λ through a diffraction grating labeled 750 lines/mm onto a screen that is positioned a distance l from the diffraction grating. The diffraction grating has a distance d between adjacent lines. The...