We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Slow light effect with low group velocity and low dispersion by adjusting parameters of elliptical scatterers for terahertz frequency.
- Authors
YONG WAN; YUE GUO; YONGCHENG ZHANG; MAOJIN YUN
- Abstract
Elliptical scatterers possess the properties of anisotropy and multiple degrees of freedom. With the plane wave expansion method, the slow light effect with high ng and low dispersion can be achieved by optimizing the structure parameters of photonic crystal waveguide with line defect, including changing the length of major axis or minor axis, and rotating scatterers relative to the direction of line defect. With operating frequency f = 1 THz (wavelength λ = 300um), the simulation shows: 1) selecting the group index ng from 38.5 to 107.4, slow light with low-dispersion bandwidth (ng varies within a 10% range) from 0.385 to 1.272 ìm, ultralow- -dispersion bandwidth (ng varies within a 1% range) from 0.188 to 0.548 ìm, and scalar product ngÄë /ë from 0.138 to 0.180 were obtained by changing the length of major axis or minor axis; 2) selecting the group index ng from 38.6 to 107.7, slow light with low-dispersion bandwidth from 0.436 to 1.443 ìm, ultralow-dispersion bandwidth from 0.201 to 0.907 ìm, and scalar product ngδ&λ/λ from 0.157 to 0.186 were achieved by rotating scatterers θ = 30° relative to the direction of line defect. Moreover, slow light with near-zero dispersion (dispersion parameter D less than 0.01 ps/mm·nm) can also be obtained by these methods, which implies that choosing suitable scatterers and adjusting their parameters we can efficiently achieve slow light with high ng with wideband and low dispersion.
- Subjects
SCATTERING (Physics); SUBMILLIMETER waves; ANISOTROPY; DEGREES of freedom; DISPERSION (Chemistry); PHOTONIC crystals
- Publication
Optica Applicata, 2013, Vol 43, Issue 4, p831
- ISSN
0078-5466
- Publication type
Article
- DOI
10.5277/oa130418