Publications by Tristan Sfez | EPFL Graph Search

Manipulating Bloch surface waves in 2D: a platform concept-based flat lens

Tristan Sfez, Hans Peter Herzig, Libo Yu, Lubos Hvozdara, Joab Di Francesco, Elsie Barakat

At the end of the 1970s, it was confirmed that dielectric multilayers can sustain Bloch surface waves (BSWs). However, BSWs were not widely studied until more recently. Taking advantage of their high-quality factor, sensing applications have focused on BSW ...

Nature Publishing Group2014

Planar multilayers as a versatile platform for nano-photonics

Tristan Sfez, Hans Peter Herzig, Olivier Martin, Andrea Lovera, Alessandro Angelini, Francesco Michelotti

2012

Ultrathin waveguides for Bloch Surface Waves: near-field analysis of propagation and polarization

Tristan Sfez, Hans Peter Herzig, Olivier Martin, Daniele Brunazzo, Libo Yu

We demonstrate that an ultrathin ridge (< lambda/10) can guide Bloch surface waves in a dielectric multilayer. The propagation and polarization properties of the guided modes are investigated with a multi-heterodyne scanning near-field optical microscope. ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2010

Bloch surface waves in ultrathin waveguides: near-field investigation of mode polarization and propagation

Tristan Sfez, Hans Peter Herzig, Olivier Martin, Daniele Brunazzo, Libo Yu, Francesco Michelotti

In this work, we use a multi-heterodyne scanning near-field optical microscope to investigate the polarization and propagation of Bloch surface waves in an ultrathin (similar to lambda/10) ridge waveguide. First, we show that the structure sustains three s ...

2010

Guided Bloch Surface Waves on Ultrathin Polymeric Ridges

Tristan Sfez, Hans Peter Herzig, Olivier Martin, Daniele Brunazzo, Francesco Michelotti

We present a direct evidence of Bloch surface waves (BSWs) waveguiding on ultrathin polymeric ridges, supported by near-field measurements. It is demonstrated that near-infrared BSWs sustained by a silicon-based multilayer can be locally coupled and guided ...

American Chemical Society (ACS)2010

Near-field polarization measurements based on two arbitrary, orthogonal optical field components

Tristan Sfez, Hans Peter Herzig, Olivier Martin, Daniele Brunazzo, Libo Yu, Francesco Michelotti

Using a multi-heterodyne scanning near-field optical microscope, we detect two arbitrary, orthogonal components of the near field. A numerical treatment of the experimental data allows the retrieval of the transverse and longitudinal components of the mode ...

2010

Investigation of Surface Electromagnetic Waves with Multi-Heterodyne Scanning Near-Field Optical Microscopy

Tristan Sfez

In this thesis, we present the development of a tunable Multi-Heterodyne Scanning Near-Field Optical Microscope (MH-SNOM). This instrument has been built and evaluated for the investigation of optical near fields in amplitude, phase and polarization. With ...

EPFL2010

Two-dimensional optics on silicon nitride multilayer: Refraction of Bloch surface waves

Tristan Sfez, Hans Peter Herzig, Libo Yu, Francesco Michelotti

When properly designed, a dielectric multilayer can sustain Bloch surface waves (BSWs). Using a multiheterodyne scanning near-field optical microscope that resolves phase and polarization, we will show that a thin dielectric structure deposited on the mult ...

American Institute of Physics2010

Asymmetrical excitation of surface plasmon polaritons on blazed gratings at normal incidence

Tristan Sfez, Hans Peter Herzig, Libo Yu

We present results of numerical simulations and preliminary experiments to investigate and characterize the effect of asymmetrical coupling of normally incident light to surface plasmon polaritons (SPPs) on metallic blazed gratings. Two types of blazed gra ...

2009