# Two Holograms in One Surface

**Source**: https://aph.caltech.edu/news/two-holograms-in-one-surface
**Parent**: https://aph.caltech.edu/people/faraon

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Two Holograms in One Surface

# Two Holograms in One Surface

December 11, 2017

[Andrei Faraon](https://aph.caltech.edu/people/faraon), Assistant Professor of Applied Physics and Materials Science, graduate student Seyedeh Mahsa Kamali, and colleagues have figured out a way to encode more than one holographic image in a single surface without any loss of resolution. The team developed silicon oxide and aluminum surfaces studded with tens of millions of tiny silicon posts, each just hundreds of nanometers tall. Each nanopost reflects light differently due to variations in its shape and size, and based on the angle of incoming light. [[Caltech story](http://www.caltech.edu/news/two-holograms-one-surface-80622)]

Written by

Trity Pourbahrami

Graduate student Seyedeh Mahsa Kamali

Professor Andrei Faraon

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