Preliminary Exam Talk

Polychromatic Address Multiplexing in Fluorophore Networks

Speaker:Mohammad Mottaghi
mamad at
Date: Wednesday, July 11, 2012
Time: 11:00am - 1:00pm
Location: D344 LSRC, Duke
Alvin Lebeck, Daniel Sorin, Benjamin Lee


Digital storage density is increasingly becoming important in the age of digital media for a variety of reasons including archival purposes and smaller sizes required in mobile devices. Higher storage density in mainstream reflective media (such as DVD and Blu-Ray) is achieved by increasing the pit density (pit is a small depression on a DVD surface that is used to store data). However, pit density is limited by the wavelength of the laser used for reading such media. Fluorescence based media, on the other hand can provide higher storage density at the same pit density, because each fluorescent pit can store multiple bits. Therefore for high density media, fluorescence-based storage seems to eventually replace reflection based storage (DVD, Blu-Ray), as it does not necessarily require shorter wavelengths for higher density.

In this work we introduce polychromatic address multiplexing (PAM) to provide exponential increase in fluorescence based storage media. A PAM pit (cell) contains a large number of storage elements each of which can store different values. A unique combination of addressing wavelengths is used to selectively read these different values. By employing multiple wavelengths in the read process, PAM discs can host hundreds of virtual storage layers in a single physical layer, yielding several-thousand-fold increase in storage density.

Advisor(s): Chris Dwyer