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Published on: November 30, 2012
Polarization selective, graded-reflectivity resonance filter, using a space-varying guided-mode resonance structure.
Menelaos K Poutous1, Aaron J Pung, Pradeep Srinivasan
1Center for Optoelectronics and Optical Communications, University of North Carolina at Charlotte, Charlotte, North Carolina 28223, USA. mpoutous@uncc.edu
Optics Express
|January 4, 2011
Summary
We developed novel polarization-selective resonant filters using guided-mode resonance. These filters exhibit precise spectral responses, enabling sensitive wavelength detection for advanced optical applications.
Area of Science:
- Photonics and Optical Engineering
- Nanotechnology and Materials Science
Background:
- Guided-mode resonance (GMR) devices offer unique spectral filtering capabilities.
- Achieving polarization selectivity and graded reflectivity is crucial for advanced optical systems.
- Controlling device architecture spatially is key to tailoring optical responses.
Purpose of the Study:
- To design, fabricate, and test polarization-selective, graded-reflectivity resonant filters.
- To explore a radial-gradient, spatially-distributed GMR device architecture.
- To demonstrate precise spectral-resonance responses across the filter aperture.
Main Methods:
- Utilized a guided-mode resonance device architecture with radial-gradient design.
- Employed multiple lithographic exposures and biasing exposure methods for fabrication.
- Tested filter performance for spectral sensitivity and polarization selectivity.
Main Results:
- Demonstrated filters with polarized spectral-resonance responses between 1535 nm and 1540 nm.
- Observed high spectral sensitivity, detecting wavelength changes as low as 0.2 nm.
- Engineered devices with sub-aperture regions, avoiding hard boundaries and diffraction anomalies.
Conclusions:
- The developed GMR filters successfully achieve polarization selectivity and graded reflectivity.
- The radial-gradient architecture enables precise control over spectral-resonance distribution.
- These filters show significant potential for sensitive optical sensing and wavelength-selective applications.
Related Concept Videos
01:23Parallel Resonance
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
01:24Characteristics of Series Resonant Circuit
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as: