thickness of thin film can be estimated by interference

Thickness and optical constants measurement of thin film growth with circular heterodyne interferometry Cheng-Chih Hsu a,*, Ju-Yi Lee b, Der-Chin Su c aCenter for Measurement Standards, Industrial Technology Research Institute, 321 Kuang Fu Rd., Sec. In this case it is light waves that are being reflected from the front and rear surfaces of thin soap or oil films. The light reflected from any one Experimental To determine n and k a number of optical measurements are needed which require accessories to be added to the UV/Vis spectrometer. [14] Vibrating microtome The vibrating microtome operates by cutting using a vibrating blade, allowing the resultant cut to be made with less The air wedge interference technique is used first to accurately estimate the thickness of free-standing thin film. Theory: Thin Film Interference • Start at the beginning: interference effects are observable in sheet transparent materials – Thin film: a layer of sheet ... determination of the film thickness • Determine the film thickness by using the following formulas: 2 (1) 1 nt d n t d = − = n = index of refraction of film The thickness of the section can be estimated by the thin-film interference colors of reflected light that are seen as a result of the extremely low sample thickness. Thin Film Interference 12 n1 n2 n3 n1

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