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Highly tunable photonic crystal filter for the terahertz range
H Nĕmec1, P Kuzel, L Duvillaret
1Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic.
Optics Letters
|March 26, 2005
Summary
Researchers achieved 60% thermal tuning of a defect mode in a periodic structure using strontium titanate (SrTiO3) as a defect material. This compact structure allows control over the lowest forbidden band.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Photonics
Background:
- Periodic structures offer unique optical properties.
- Defect modes can be engineered for specific functionalities.
- Strontium titanate (SrTiO3) exhibits tunable dielectric properties.
Purpose of the Study:
- To achieve thermal tuning of a defect mode within a periodic structure.
- To explore the use of incipient ferroelectrics as defect materials.
- To maximize the tunability of a compact photonic structure.
Main Methods:
- Fabrication of a periodic structure with alternating quartz and high-permittivity ceramic layers.
- Insertion of strontium titanate (SrTiO3) as a defect layer.
- Thermal modulation of the defect mode's properties.
Main Results:
- Successfully obtained thermal tuning of a single defect mode.
- Tuning occurred across the entire lowest forbidden band.
- Achieved a maximum tunability of 60%.
Conclusions:
- Incipient ferroelectric SrTiO3 is effective for creating tunable defect modes.
- The demonstrated periodic structure offers high thermal tunability.
- This work enables advanced optical device applications.