Publications de Qing Tan | EPFL Graph Search

Phase-sensitive near field Investigation of Bloch surface wave propagation in curved waveguides

Hans Peter Herzig, Liang Sun, Qing Tan, Libo Yu, Elsie Barakat, Jian Wang

Bloch surface waves (BSWs) are electromagnetic surface waves excited in the band gap of a one dimensional dielectric photonic crystal. They are confined at the interface of two media. Due to the use of dielectric material, the losses are very low, which al ...

European Optical Soc2014

Shaping intensity behind amplitude masks for proximity correction lithography: Design, measurement and realization

Hans Peter Herzig, David Nguyen, Qing Tan, Toralf Scharf, Krishnaparvathy Puthankovilakam

Proximity exposure techniques in lithography are getting more and more popular because of the cost of ownership advantage of mask aligners compared to projection systems. In this paper a gap between simulation and the final result, the prints will be close ...

Spie-Int Soc Optical Engineering2014

Subwavelength Metallic Structures for Sensing : Modeling & Characterization

Qing Tan

Following rapid developments in biotechnology and medicine, optical sensing promises to be extremely important in various applications such as drug discovery, environmental monitoring, etc. Refractive index (RI) based optical sensing is straightforward to ...

EPFL2012

Refractive index sensor based on slot waveguide cavity

Hans Peter Herzig, Armando Cosentino, Qing Tan

The experimental study of a gold slot waveguide cavity is presented. The resonance of this cavity working in the telecom wavelength range is highly dependent on the refractive index of the medium located in or around the slots array, because of the high co ...

European Optical Soc2012

In-plane illuminated metallic annular aperture array for sensing application

Hans Peter Herzig, Armando Cosentino, Qing Tan

We propose here an application to sensing of annular aperture arrays (AAA). We theoretically investigate the optical properties of the reflective AAA device when illuminated in-plane. The cavity presents almost perfect absorption due to the waveguide mode ...

Optical Society of America2012

Theoretical and experimental study of a 30nm metallic slot array

Hans Peter Herzig, Armando Cosentino, Qing Tan

We present the simulation, fabrication, and characterization of a metallic slot grating on a silicon waveguide (30nm slot width for a period of 500nm). According to the simulation, the experimental measured spectrum of the structure exhibits a dip in the n ...

2011

Fabrication of slot waveguide cavity for sensing application

Hans Peter Herzig, Armando Cosentino, Qing Tan

The fabrication of a slot waveguide cavity oriented to sensing application is demonstrated. The choice of materials and the development of the process flow steps, including E-beam lithography (EBL) and metal lift-off of a single thin layer, are illustrated ...

2010

Metallic Optical Nanostructures: a Solution for Planar Integrated Sensors on Waveguides

Hans Peter Herzig, Armando Cosentino, Qing Tan

We study the optical properties of two different metallic nanostructure arrays for lable-free sensing applications. The sensors are optimized to detect refractive index (RI) variations. The optical interaction between light and analyte is enhanced by field ...

2010

Switchable photonic crystal cavity by liquid crystal infiltration

Pierre-Yves Baroni, Hans Peter Herzig, Armando Cosentino, Vincent Paeder, Qing Tan, Toralf Scharf

We report on the fabrication and optical characterization of a switchable photonic crystal nanocavity actuated by liquid crystals. This device acts as a filter presenting a transmission peak around the telecom wavelength λ = 1550 nm. Passing from the isotr ...

European Optical Society2010