Soap Bubble

Thin Film Technology

Optical thin films modify the way light is transmitted through (or reflected from) a transparent surface by a phenomenon known as interference.  Constructive and destructive interference of light waves is the reason why thin films such as soap bubbles show colourful patterns. 

This is known as thin film interference because it light waves reflecting from the top surface of a film interfere with light waves reflecting from the bottom surface.  Colours are generated when the thickness of the film is in the region of the wavelength of light.  Optical thin film design encapsulates this principle in solid form, where layers of different transparent materials are deposited onto a substrate to a predetermined design thickness.  This process controls the way light passes through or is reflected from a surface.

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