Demonstration of integrated optics elements based on long-ranging surface plasmon polaritons.
ABSTRACT An experimental investigation of long-ranging surface plasmonpolariton waves guided along thin finite width Au structures embedded in a homogeneous background dielectric is reported. The operation of key passive integrated optics elements such as straight waveguides, s-bends, y-junctions and couplers is demonstrated at a free space optical wavelength of 1550 nm. The influence of some important design parameters on the performance of these elements is presented and discussed.
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ABSTRACT: The characteristics of long-range hybrid plasmonic modes guided by multilayer metal-dielectric planar waveguides are investigated at the telecom wavelength. These multilayer structures are formed by sandwiching thin metallic stripes into horizontal silicon slot-like waveguides. Comprehensive numerical studies regarding the geometric parameters' effects on the modal properties reveal that, by properly choosing the dimensions of the metal stripe and the low-index gaps between the stripe and the silicon layers, the symmetric hybrid modes supported by the structures could feature simultaneously ultra-long propagation distance (several centimeters) and subwavelength mode size. Consideration of possible fabrication imperfections shows that the optical performances of the waveguides are quite robust and highly tolerant to these errors. The presented multilayer plasmonic structures greatly extend the capabilities of conventional long-range surface plasmon polariton waveguides by successfully confining light into a subwavelength scale while maintaining the key advantage of enabling ultra-low-loss propagation, which could facilitate potential applications in ultra-long-range plasmon waveguiding and realizations of compact, high-performance photonic components, as well as building optically integrated circuits with complex functionalities.Journal of optics 01/2014; 16(1). · 2.01 Impact Factor
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ABSTRACT: A novel (to our knowledge) hybrid plasmonic (HP) hollow waveguide is proposed for nanoscale optical confinement. The light is guided, with improved propagation characteristics, in an air slice sandwiched between metal and silicon. The optical mode in silicon is dragged toward the metal-dielectric (air) interface to make it a HP mode by optimizing the waveguide dimensions. In comparison to the hybrid mode confined in the dielectrics, the air-confined hybrid mode exhibits a smaller effective mode area A<sub>m</sub>=0.0685/μm<sup>2</sup> and longer propagation distance L<sub>p</sub>=142 μm with a low modal propagation loss of 0.03 dB/μm at optimized values of the width and height of the air slice.Applied Optics 03/2014; 53(9):1954-7. · 1.69 Impact Factor
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ABSTRACT: We experimentally demonstrate efficient extinction spectroscopy of single plasmonic gold nanorods with exquisite fidelity (SNR > 20dB) and high efficiency light coupling (e. g., 9.7%) to individual plasmonic nanoparticles in an integrated platform. We demonstrate chip-scale integration of lithographically defined plasmonic nanoparticles on silicon nitride (Si<sub>3</sub>N<sub>4</sub>) ridge waveguides for on-chip localized surface plasmon resonance (LSPR) sensing. The integration of this hybrid plasmonic-photonic platform with microfluidic sample delivery system is also discussed for on-chip LSPR sensing of D-glucose with a large sensitivity of ∼ 250 nm/RIU. The proposed architecture provides an efficient means of interrogating individual plasmonic nanoparticles with large SNR in an integrated alignment-insensitive platform, suitable for high-density on-chip sensing and spectroscopy applications.Optics Express 12/2013; 21(26):32086-98. · 3.55 Impact Factor