Photo-thermal modulation of surface plasmon polariton propagation at telecommunication wavelengths.

We report on photo-thermal modulation of thin film surface plasmon polaritons (SPP) excited at telecom wavelengths and traveling at a gold/air interface. By operating a modulated continuous-wave or a Q-switched nanosecond pump laser, we investigate the photo-thermally induced modulation of SPP propagation mediated by the temperature-dependent ohmic losses in the gold film. We use a fiber-to-fiber characterization set-up to measure accurately the modulation depth of the SPP signal under photo-thermal excitation. On the basis of these measurements, we extract the thermo-plasmonic coefficient of the SPP mode defined as the temperature derivative of the SPP damping constant. Next, we introduce a figure of merit which is relevant to characterize the impact of temperature onto the properties of bounded or weakly leaky SPP modes supported by a given metal at a given wavelength. By combining our measurements with tabulated values of the temperature-dependent imaginary part of gold dielectric function, we compute the thermo-optical coefficients (TOC) of gold at telecom wavelengths. Finally, we investigate a pulsed photo-thermal excitation of the SPP in the nanosecond regime. The experimental SPP depth of modulation obtained in this situation are found to be in fair agreement with the modulation depths computed by using our values of gold TOC.

[1]  W. E. Lawrence,et al.  Intraband optical conductivity sigma/omega,T/ of Cu, Ag, and Au - Contribution from electron-electron scattering , 1981 .

[2]  A. Dereux,et al.  Nanosecond thermo-optical dynamics of polymer loaded plasmonic waveguides. , 2013, Optics express.

[3]  B. Palpant,et al.  Counterintuitive thermo-optical response of metal-dielectric nanocomposite materials as a result of local electromagnetic field enhancement , 2006 .

[4]  Kikuo Ujihara,et al.  Reflectivity of metals at high temperatures , 1972 .

[5]  P. Winsemius,et al.  Temperature dependence of the optical properties of Au, Ag and Cu , 1976 .

[6]  A. Dereux,et al.  Efficient photo-thermal activation of gold nanoparticle-doped polymer plasmonic switches. , 2012, Optics express.

[7]  T. Holstein,et al.  Theory of transport phenomena in an electron-phonon gas , 1964 .

[8]  Wayne Dickson,et al.  Low-temperature plasmonics of metallic nanostructures. , 2012, Nano letters.

[9]  Sergey I. Bozhevolnyi,et al.  In-line extinction modulator based on long-range surface plasmon polaritons , 2005 .

[10]  J. P. Goudonnet,et al.  Optical modulation processes in thin films based on thermal effects of surface plasmons , 2005 .

[11]  Karim Hassan,et al.  Thermo-optic plasmo-photonic mode interference switches based on dielectric loaded waveguides , 2011 .

[12]  P. Berini,et al.  Thermo-optic characterization of long-range surface-plasmon devices in Cytop. , 2013, Applied optics.

[13]  Jung Jin Ju,et al.  Optical constants of evaporated gold films measured by surface plasmon resonance at telecommunication wavelengths , 2008 .

[14]  D. Koller,et al.  Leakage radiation microscopy of surface plasmon polaritons , 2008, 1002.0725.

[15]  G. Millot,et al.  Grating Couplers for Fiber-to-Fiber Characterizations of Stand-Alone Dielectric Loaded Surface Plasmon Waveguide Components , 2012, Journal of Lightwave Technology.

[16]  Sahin Kaya Ozdemir,et al.  Temperature effects on surface plasmon resonance: design considerations for an optical temperature sensor , 2003 .

[17]  Romain Quidant,et al.  Thermo‐plasmonics: using metallic nanostructures as nano‐sources of heat , 2013 .

[18]  R. W. Christy,et al.  Electron-electron scattering in the intraband optical conductivity of Cu, Ag, and Au , 1977 .

[19]  R. Rosei,et al.  Splitting of the interband absorption edge in Au: Temperature dependence. , 1975 .

[20]  C. Thirstrup,et al.  Temperature-dependent sensitivity of surface plasmon resonance sensors at the gold–water interface , 2008 .

[21]  A. Pitilakis,et al.  Longitudinal 2 x 2 Switching Configurations Based on Thermo-Optically Addressed Dielectric-Loaded Plasmonic Waveguides , 2011, Journal of Lightwave Technology.

[22]  P. Guyot-Sionnest,et al.  Reduced damping of surface plasmons at low temperatures , 2009 .

[23]  N. Allé,et al.  Performance of thermo-optic components based on dielectric-loaded surface plasmon polariton waveguides , 2013 .

[24]  Ahmed Hassanein,et al.  Application of finite-difference methods to membrane-mediated protein interactions and to heat and magnetic field diffusion in plasmas , 2006, J. Comput. Phys..

[25]  R. W. Christy,et al.  Optical Constants of the Noble Metals , 1972 .

[26]  Ping Hui,et al.  Thermal conductivities of evaporated gold films on silicon and glass , 1999 .

[27]  Sergey I. Bozhevolnyi,et al.  Performance of thermo-optic components based on dielectric-loaded surface plasmon polariton waveguides , 2013, Scientific Reports.

[28]  P. Berini,et al.  Thermally Activated Variable Attenuation of Long-Range Surface Plasmon-Polariton Waves , 2006, Journal of Lightwave Technology.

[29]  Traianos V. Yioultsis,et al.  Theoretical analysis of thermally tunable microring resonator filters made of dielectric-loaded plasmonic waveguides , 2009 .

[30]  G. P. Pells,et al.  The optical properties of copper and gold as a function of temperature , 1969 .

[31]  P. Dawson,et al.  Measurement and interpretation of the mid-infrared properties of single crystal and polycrystalline gold , 2005 .

[32]  A Passian,et al.  Modulation of multiple photon energies by use of surface plasmons. , 2005, Optics letters.

[33]  D. Lynch,et al.  Thermomodulation Spectra of Al, Au, and Cu , 1972 .

[34]  J. Rayne,et al.  Temperature dependence of the infrared absorptivity of the noble metals , 1976 .

[35]  B. Palpant,et al.  Highly dispersive thermo-optical properties of gold nanoparticles , 2007 .

[36]  U. Grassano,et al.  d bands position and width in gold from very low temperature thermomodulation measurements , 1973 .

[37]  Kikuo Ujihara.  Reflectivity of Metals at High Temperatures , 1972 .

[38]  Girard,et al.  Optical addressing at the subwavelength scale , 2000, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[39]  Tunable microring resonator based on dielectric-loaded surface plasmon-polariton waveguides , 2011, 2010 3rd International Nanoelectronics Conference (INEC).