Title page for ETD etd-01092002-222206


Type of Document Master's Thesis
Author Chandran, Ashwin
Author's Email Address aschandr@vt.edu
URN etd-01092002-222206
Title Self-Assembled Multilayered Dielectric Spectral Filters
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Claus, Richard O. Committee Chair
Scales, Wayne A. Committee Member
Stolen, Roger Hall Committee Member
Keywords
  • Needle Filters
  • Optical Thin Films
  • Electro Static Self-Assembly
  • Dielectric stack filter
Date of Defense 2001-09-19
Availability unrestricted
Abstract
Thin film optical filters are made by depositing thin films of optical materials on a

substrate in such a way as to produce the required optical and mechanical properties. The

Electrostatic Self Assembly (ESA) process is accomplished by the alternate adsorption of

poly-anionic and poly-cationic molecules on progressive oppositely charged surfaces.

This technique offers several advantages such as ease of fabrication, molecular level

uniformity, stable multilayer synthesis and avoidance of the need for a vacuum

environment. The ESA process offers an excellent choice for manufacturing optical thin

film coatings due to its capability to incorporate multiple properties into films at the

molecular level and its ability to be a fast and inexpensive process. The ESA process, as a

method for manufacturing optical thin film filters has been investigated in detail in this

thesis. A specific design was made and analyzed using TFCalc, a commercial thin film

design software. Sensitivity analysis detailing the changes in filter response to errors in

thickness and refractive index produced by the ESA process were done. These proved

that with a high level of quality control, highly reliable and accurate optical thin films can

be made by the ESA process.

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