Enhanced evanescent coupling to whispering-gallery modes due to gold nanorods grown on the microresonator surface

The evanescent fields of whispering-gallery modes of a high-Q dielectric microresonator are locally enhanced via excitation of the surface plasmon resonances of gold nanorods grown on the microresonator’s surface. This results in enhanced coupling between the microresonator and an adjacent tapered optical fiber for frequencies in the vicinity of the surface plasmon resonance. The experimental results presented here demonstrate coupling enhancement by a factor of 100–1000, accompanied by an increase in absorption and scattering loss that is very small by comparison.

[1]  E. Kretschmann,et al.  Die bestimmung der oberflächenrauhigkeit dünner schichten durch messung der winkelabhängigkeit der streustrahlung von oberflächenplasmaschwingungen , 1974 .

[2]  R. H. Ritchie,et al.  Surface-Plasmon Resonance Effect in Grating Diffraction , 1968 .

[3]  G. Papavassiliou.  Optical properties of small inorganic and organic metal particles , 1979 .

[4]  Bernhard Lamprecht,et al.  Optical properties of Ag and Au nanowire gratings , 2001 .

[5]  David D. Smith,et al.  Cascaded photoenhancement from coupled nanoparticle and microcavity resonance effects. , 2007, Optics express.

[6]  B. D. Gupta,et al.  Fiber-Optic Sensors Based on Surface Plasmon Resonance: A Comprehensive Review , 2007, IEEE Sensors Journal.

[7]  E. Kretschmann,et al.  Notizen: Radiative Decay of Non Radiative Surface Plasmons Excited by Light , 1968 .

[8]  S. Shopova,et al.  Gold nanorods grown from HgTe nanoparticles directly on various surfaces , 2006 .

[9]  Shean-Jen Chen,et al.  Angular-interrogation attenuated total reflection metrology system for plasmonic sensors. , 2005, Applied optics.

[10]  J. Wilkinson,et al.  Waveguide surface plasmon resonance sensors , 1995 .

[11]  B. Menges,et al.  Multimode waveguide mode surface plasmon coupling: a sensitivity and device realizability study , 2004 .

[12]  S. Mccarthy,et al.  Anomalies in the surface plasmon resonance excitation at both surfaces of evaporated metal films , 1974 .

[13]  W. Lukosz,et al.  Principles and sensitivities of integrated optical and surface plasmon sensors for direct affinity sensing and immunosensing , 1991 .

[14]  Surface plasmon resonance-assisted coupling to whispering-gallery modes in micropillar resonators , 2007 .

[15]  I. Pockrand,et al.  Resonance anomalies in the light intensity reflected at silver gratings with dielectric coatings , 1976 .

[16]  Tiberiu-Dan Onuta,et al.  Submicrometer cavity surface plasmon sensors. , 2005, The journal of physical chemistry. B.

[17]  A. Rosenberger,et al.  Analysis of whispering-gallery microcavity-enhanced chemical absorption sensors. , 2007, Optics express.