Low-loss ultra-subwavelength hybrid plasmonic waveguide based on metallic bump structures
JOURNAL OF PHYSICS D-APPLIED PHYSICS, cilt.47, sa.10, 2014 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 47 Sayı: 10
- Basım Tarihi: 2014
- Doi Numarası: 10.1088/0022-3727/47/10/105105
- Dergi Adı: JOURNAL OF PHYSICS D-APPLIED PHYSICS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Orta Doğu Teknik Üniversitesi Adresli: Hayır
Özet
Sharp metal edges (like wedge or triangular geometries) have been widely studied as low-loss surface plasmon polariton (SPP) waveguiding structures. However, fabrication difficulties lead to round-shaped tips which have larger mode size and shorter propagation length. As a solution, here we present an easy to realize structure for turning an edge-less bump metallic geometry (whose fabrication is less troublesome) into a hybrid one. Through investigating the geometrical dispersion, propagation lengths of up to half a millimetre and effective mode areas as small as lambda(2)/330 are obtained for the 1.55 mu m telecommunication wavelength. Gain-assisted SPP propagation is also considered by introducing gain in the InGaAsP material, for which critical gain as low as 11 cm(-1) is calculated. Finally, obtained results suggest that the designed waveguide can find various applications in nanoscale waveguiding.