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Proceedings Paper

Compact preconditioned photonic crystal demultiplexers based on combined focusing and superprism effects
Author(s): B. Momeni; J. Huang; M. Soltani; M. Askari; S. Mohammadi; A. Adibi
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Paper Abstract

Wavelength demultiplexing is one of the major applications of unique dispersion properties of photonic crystals (PCs). Possibility of integration and compactness are two main advantages of PC based demultiplexers compared to other demultiplexing techniques for applications including compact spectrometers (for sensory applications) and WDM demultiplexers. Here, we show that resolution and size limitations of conventional superprism-based photonic crystal demultiplexers are caused by the choice of configuration. We suggest an alternative implementation (combining superprism effect and focusing) that improves the performance compared to the conventional implementation in terms of being more compact and relaxing the requirement for divergence angle of the incident beam. We use effective index model to describe the beam behavior inside the photonic crystal region. Using this model, effective indices (second order and third order) are calculated directly from the band structure and are used to find the optimal operation parameters for the demultiplexing device. Detailed calculations show that the required size of preconditioned superprism photonic crystal demultiplexers scales up as N5/2 (N being the number of channels which is proportional to the resolution of the device) which shows significant advantage over N4 dependence in conventional superprism-based devices, especially for high resolutions required in practical DWDM systems or spectroscopic applications. Structures obtained through optimization have been fabricated in SOI wafers using e-beam writing and ICP etching, and spatial separation of channels (with good isolation) in focusing superprism devices is experimentally demonstrated.

Paper Details

Date Published: 1 March 2006
PDF: 12 pages
Proc. SPIE 6128, Photonic Crystal Materials and Devices IV, 61280V (1 March 2006); doi: 10.1117/12.660617
Show Author Affiliations
B. Momeni, Georgia Institute of Technology (United States)
J. Huang, Georgia Institute of Technology (United States)
M. Soltani, Georgia Institute of Technology (United States)
M. Askari, Georgia Institute of Technology (United States)
S. Mohammadi, Georgia Institute of Technology (United States)
A. Adibi, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 6128:
Photonic Crystal Materials and Devices IV
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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