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Fabry-Perot filter using grating structures.

Yu-Sheng Lin¹, Chong Pei Ho, Kah How Koh

¹Department of Electrical & Computer Engineering, National University of Singapore, Singapore.

|March 19, 2013

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Grating structures significantly boost Fabry-Perot (FP) optical filter performance. Novel designs increase spectrum intensity and Q-factor, enhancing light propagation and filter efficiency.

Area of Science:

Optics and Photonics
Optical Filters
Resonator Design

Background:

Fabry-Perot (FP) resonators are crucial optical components.
Enhancing FP optical filter performance is an ongoing research area.
Existing FP resonators with slots have limitations in light propagation and intensity.

Purpose of the Study:

To investigate the impact of grating structures on FP resonator performance.
To enhance the spectrum intensity and Q-factor of FP optical filters.
To explore the effectiveness of rectangular and triangular grating (TG) structures.

Main Methods:

Designing and implementing grating structures (rectangular and TG) on the inner wall of an FP resonator.
Simulating light propagation through FP resonators with different structures (grating, slot, hybrid TG).

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Calculating and comparing spectrum intensity and Q-factor values.

Main Results:

Grating structures improve light propagation efficiency within the FP resonator.
FP resonators with grating structures show a 4.5-fold increase in spectrum intensity compared to slot designs.
A hybrid TG structure with two slots yields a 9.5-fold higher Q-factor than a single slot and a 4.7-fold higher Q-factor than TG alone.

Conclusions:

Grating structures, particularly hybrid TG designs, are highly effective in enhancing FP optical filter performance.
These optimized FP resonators offer significantly improved spectrum intensity and Q-factor.
The findings pave the way for more efficient and higher-performance optical filtering applications.