Film Definition and 309 Threads

Hello, I am having some difficulties understanding this concept. It seems like wikipedia and my notes/teacher contradict each other According to my equation sheet, the equation for dark spots is 2nt = mλ and for bright spots is 2nt = (m + 0.5)λ. However, if a phase shift of 180 degrees occurs...

Hallo alle users, as the title indicates, I have a question about measurement of thin film thickness by means of spectral reflectance. Given, the to be measured thin film has thickness less than 600 nm, but the measuring light has only wavelengh larger than 600 nm. Does it mean, that the...

Homework Statement I was asked to determin the film thickness for an oil film (n=1.33) for a light beam (500 nm) to give total reflection. I could calculate refraction angle for air to oil, but have no idea as to how to approach this question. Homework Equations The Attempt at a...

Hi guys, long time reader new poster. I am looking for ways to determine the thickness of some thin films of zinc oxide I have been producing. Conventionally I use SEM cross section, but the throughput of films has made this a little taxing. I've tried also weighing the substrates before...

a thin soap film is seen in sodium light by normal reflection method it appears totally dark deduce the possible values of film thickness given (myu)-refra.indx of liquid-1.333 and lambda wave.lgth-5893 angstrom

Homework Statement A very thin sheet of plastic (n=1.70) covers one slit of a double-slit apparatus illuminated by 630 nm light. The center point on the screen, instead of being a maximum, is dark. What is the (minimum) thickness of the plastic? Homework Equations Constructive...

I put together this little movie as (hopefully) the first in a series. http://www.youtube.com/watch?v=xjMjWtntm9k" My target audience is a second semester class of physics students that have already had a lectures in basic wave optics. When I give this URL to my students, it's with the...

Apparently Mel Gibson is making a movie about the Maccabean revolt around 150 BC. Mel is a Roman Catholic and two books of their Bible are Maccabees 1 and 2. There is a 3 and 4 in the Greek Catholic Bible. None of the books are found in the Jewish and Protestant Bibles, but used to be. The...

Hi, I have deposited a film of dielectric on SiO2 substrate. Then, deposited metal dots on the top of dielectric film to measure electrical properties. I want to measure capacitance using metal dots on the top of dielectric. Since I have SiO2 as a substrate, I can not make a parallel plate...

How much does one earn to be a film producer/playwriter in the US ? Many people seem to run into this industry. I bet if it is less than 10G/film item, they won't work ? Thank you

Look at the picture below, I have to prove that the optical path length difference is \Delta=n(BC+CD)-BE=2nd\cos(r) [PLAIN]http://img200.imageshack.us/img200/2271/schermata082455775alle1.th.png The problem is just how to get 2nd\cos(r) I actually don't have any idea :\ I have...

Hello, I am trying to understand thin film (in air) interference but I have a problem: I know we have destructive interference when \delta=(2m+1)\pi. Now i can try to calculate the thickness of the film to get it, so since \delta =\frac{4nt\pi}{\lambda} - \pi where t is the thickness...

having watched the film source code where they try and persuade that quantum physics allows for the brain to contain infinite parallel worlds i wondered if anyone made sense of it. As far as i could tell it was total rubbish from start to Finnish. Even down to the guy managing to send a text...

Autochrome is a photography technique which all details forgotten 50 years ago but counted as the best color photograph technique. There are two layers on glass , one RGB Screen and second , a bw emulsion. When RGB filter separates the image , bw all color sensitive layer records the tones...

Ok. I know this may sound like a stupid question but for the life of me i can't find definitions for these terms. I am working on developing a PVDF polymer based piezoelectric film and need to know what the terms Uniaxial and biaxial mean. I am using an electrospining method to make the fibers...

In my opinion, the most powerful score from any movie in history would have to be from the "saw" film franchise. Gives you goosebumps if you play it with the sound blasting. Composed by Charlie Clouser.

I have been repairing some devices but some of them have the pad connection ripped off so I can not repair the USB tips. I have found out how to repair the ripped connection which is the following procedure; Either a conductive liquid or film epoxy is put on the ripped connection area, then the...

Homework Statement A piece of paper of thickness 15 * 10^-6 m is used to create an air wedge between 2 glass slides that are 7.25 cm long. If the wavelength of the light being used is 595 nm, how many interference fringes are counted across the entire pattern? Homework Equations delta...

1. Calculate the minimum thickness of the film for which the intensity of the reflected red ray is near zero. (This is AP Physics B 2010 (c)ii.) I found the wavelength in the film to be 4.81x10-7 m nf=1.382. 2L=mλ (destructive interference) The Attempt at a Solution My first attempt yielded a...

Homework Statement A pair of very flat glass plates, 7.41 cm long, touch at one end and are separated at the other end by a small piece of 44 gauge copper wire, 5.08×10−5 m in diameter. An air wedge is formed between the glass plates by this supporting wire. Light of wavelength 631 nm...

I am looking over thin film interference and am having some difficulty understanding when to know if a reflected ray will be 180 degrees out of phase or in phase. I know that a ray reflecting off a medium with a higher index of refraction will have a 180 degree phase change; and that a ray...

Homework Statement See figure attached. Homework Equations The Attempt at a Solution Not too sure how to do this one. I tried thinking about what it was doing before the air was replaced with the liquid. With air, The first reflection would have no phase shift (glass...

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, 1.66 for the thin film, and 1.50 for the bottom material. The film thickness is 5.4 10-7 m. Homework...

Hi all, Can the claim made that this is a ghost be debunked from watching the video alone? http://uk.news.yahoo.com/38/20110329/tod-family-captures-poltergeist-on-film-045b8e8.html"

Homework Statement See figure attached for problem statement as well as my attempt. Homework Equations The Attempt at a Solution I don't know where to go from here. Can someone help me get started?

HELP with thin film problem! Homework Statement Consider a horizontal plane of thin film with a thickness t. This film is located in between air and water (see sketch). Light is directed from the air downward through the film and into the water, perpendicular to the surfaces.The index...

Hello everyone. I need to simulate flux densities generated by thin films of permanent magnets of varying composition. This is to guide selection of parameters for sputtering of Nd-Fe-B permanent magnets. Does anyone know of a program which will allow me to simulate fields from permanent...

I am taking the spectra of lithium, carbon and mercury on a piece of film with the help of a spectrograph. One of the parameters that affect the readings is the exposure times. (How?) I have to find the correct exposure times experimentally. (Why?) That is because the exposure times depend on...

Homework Statement Light of wavelength 526 nm is incident normally on a film of water 1.0 µm thick. The index of refraction of water is 1.33. (c) What is the phase difference between the wave reflected from the top of the air-water interface and the one reflected from the bottom of the...

Hello there, Right now I'm in a physics lab in which I have a vacuum jar, a thin film evaporation apparatus, and the instructions to do something interesting. I'm looking at a bunch of ideas right now, but one project that appeals to me is a multi-layer anti-reflective coating. The way I'd...

Kind of late, but has everyone seen this film? Anyone figured it out? What are your theories on what's going on?

Homework Statement I need to calculate n, k and d of an "unknown" thin film. I have the transmission spectra of the substrate (MgF2) and substrate + "unknown" thin film See the attachments with: three files - two screenshots of the transmission spectra (see file name for description) -...

Homework Statement [PLAIN]http://img403.imageshack.us/img403/2696/33095583.jpg The attempt at a solution I simply took 425 nm and divided it by 4 by using the destructive reflection from thin film. I got 106 nm as my answer, which is c. Is this correct?

Homework Statement Estimate the transmission of light with \lambda=1\mu m that is transmitted through 20nm thick gold film at 77k where The DC conductivity: \sigma_{DC}=2*10^8 \Omega^{-1} m^{-1}) The carrier density: n=5.9*10^28 m^{-3}) and the plasmon frequency...

Homework Statement (1 / 2) (λ1 /nfilm) (m1) = (1 /4) (λ2 / nfilm) (2m2 +1) (2*m2 + 1) / (2*m1) =λ1 / λ2 = 640 nm / 512 nm = 1.25 We want to solve for m1 and m2. I have realized that using m1=m2=2 works but I can't figure out how to reach this conclusion mathematically. Please, any...

Hello there, I'm an undergrad in my 3rd year and I'm doing an investigation into the 'Preparation of Thin Films and their use in Hall Effect measurements.' We are making thin films of bismuth on glass (with pre drilled terminals) in a vacuum system. The way they suggest measuring the...

Homework Statement Hi all, i have a question on thin film interference. Lets say there is an oil drop on the surface of water. Light reflected from the oil drop is observed from above. Explain why interference fringes are not seen when the thickness of the oil drop increases...

Interference with thin film :( Homework Statement A soap film in air is 320nm. thick. If it is illuminated with white light at normal incidence, what colour will it appear to be in reflected light (assume that the index of the soap film is 1.33). Homework Equations The condition for...

http://www.youtube.com/watch?v=Y6a4T2tJaSU&feature=player_embedded Just for fun, more than anything. But you got to admit, it is intriguing, particularly if you watch the scene more than a couple of times. It does seem that she (he ?) is talking into a cell phone .. in 1928. And no, I am...

Could Hurkyl do Princess Bride? "Inconceivable!" "I don't think that word means what you think it does." Good film.

Problem A thin film of oil (n = 1.30) is located on a smooth, wet pavement. When viewed perpendicular to the pavement, the film reflects most strongly red light at 640 nm and reflects no light at 548 nm. How thick is the oil film? Equations and Attempt Refractive index: air - 1 oil -...

Just off the top of my head: I'm rather partial to this portrait of Napoleon... [PLAIN]http://www.nmm.ac.uk/tserver.php?f=NAN0120.jpg&h=650&legacyResize Somehow, I just don't think I could ever execute red velor pants as well (really more of a blue jeans or brown slacks kind of guy)...

Homework Statement A glass (Refractive index 1.33) is coated with a thin film. (Refractive index 1.50) Find the minimum thickness of the film, if the glass is to transmit light of wavelength λ. Homework Equations The Attempt at a Solution Light reflected from the upper surface of...

Currently in our lab we have a WEDGE shaped sample that we would like to be able to know the thickness at various points along it. Our sample is about 5mm x 5mm. The wedge SHOULD extend from one side to the other. At the highest point, the wedge is 50nm, and then drops down, hopefully at a...

InVisage: "Quantum Film" - real of fake? First a link: http://www.invisageinc.com/page.aspx?cont=QuantumFilm%20Technology" . (Company's website page for it; used for their wording on the claims.) Then another: http://www.google.com/search?q=quantum+film". (Google Web Search for Quantum Film...

I understand the idea behind the optical interference that produces colors on thin films but have never figured out the reason that the films have to by 'thin'. What is the lack of similarity that I am missing between a film and a somewhat thick sheet of glass or something that makes these...

Hi, I'm a high school physics student and I'm having a lot of trouble with thin film interference Homework Statement A thin layer of oil (noil=1.25) is floating on water (n=1.33). How thick is the oil in the region that strongly reflects green light (λ=556nm)? Homework Equations noil/nwater...

I need to write up some stuff with general information about different interfaces used in Thin Film Processing. I'm pretty sure its a way to analyze the quality of the different procedures. * Abrupt Interface * Mechanical Interface * Graded Interface * Compound Interface * Psuedo...

Hi, I was studying the effect of high voltage on the properties of Mylar film. The voltage input can be both DC (around several hundred volts to 1000V) and AC (same level as DC). The Mylar film is very thin, 6um, I know the film is going to be charged, but I don't know 1. how fast the film...

Homework Statement A thin film with a refractive index of n=1.50 is surrounded by air. Wavelengths of light 360, 450, and 602 nm are the only visible wavelengths missing from the reflected light. What is the thickness of the film. Homework Equations The Attempt at a Solution One...