摘要： A novel ultracompact (<;7 × 0.4 μm 2 ) polarization mode converter for converting quasi-TE00 mode of a silicon strip waveguide (WG) to the fundamental quasi-TM mode of a hybridplasmonic WG (HPW) without lateral structures is described. The mode-evolution-based design consists of three-section asymmetric HPWs, each of which has a unique top silver structure. A newly defined asymmetry index whose minimum suggests the strongest decoupling of longitudinal field components in three-dimensional guiding structures is used to rapidly obtain a suboptimal design of top metallic structure without relying heavily on parameter sweeps using numerical computations. The optimized converter exhibits a mode conversion efficiency (MCE) of 88.79%, an insertion loss (IL) of 0.5139 dB, and a polarization conversion efficiency (PCE) of 99.82% at 1550 nm. The respective 1-dB optical bandwidths for the MCE and IL are about 104 and 108 nm, while the PCE is >92% over a 172 nm spectral range. The fabrication tolerances for top silver structures are also discussed. 其他題名： JLT 出版者： New York: IEEE 出版日期： 2015-10-15 出處： Journal of Lightwave Technology, 2015-10, Vol.33 (20), p.4261-4267 資源來源： IEEE Electronic Library (IEL) 版權： Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) Oct 15, 2015 識別號： ISSN: 0733-8724 識別號： EISSN: 1558-2213 識別號： DOI: 10.1109/JLT.2015.2464685 識別號： CODEN: JLTEDG
