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Christian Santschi

Cette personne a quitté l’EPFL

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Publications associées (69)

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Biophotonic tool for sensing the dynamics of H2O2 extracellular release in stressed cells

Olivier Martin, Christian Santschi, Shourya Dutta Gupta

Hydrogen peroxide (H2O2) is known to play a multifaceted role in cell physiology mechanisms involving oxidative stress and intracellular signal transduction. Therefore, the development of analytical tools providing information on the dynamics of H2O2 gener ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2012

Size control of self-organized gold nanoparticles on nanopatterned single crystal diamond

Olivier Martin, Niels Quack, Christian Santschi, Marcell Kristof Kiss, Sichen Mi

Surface patterning using plasmonic nanoparticles has attracted increasing interest owing to their wide use in sensing, imaging and medical applications. In this report we demonstrate bottom-up engineering of size distribution of gold nanoparticles (AuNPs) ...

IEEE2018

Quantitative Extraction of Equivalent Lumped Circuit Elements for Complex Plasmonic Nanostructures

Olivier Martin, Christian Santschi, Banafsheh Abasahl

We establish a general method to bridge the gap between full-field electromagnetic calculations and equivalent lumped circuit elements to describe the optical response of plasmonic nanostnictures. The exact value of each lumped element is extracted from on ...

Amer Chemical Soc2014

Cross section investigations of compositions and sub-structures of tips obtained by focused electron beam induced deposition

Philippe Buffat, Patrik Willi Hoffmann, Christian Santschi, Marco Cantoni, Johann Michler, Danièle Laub, Ivo Utke

The spatial evolution of compositions and sub-structures inside focused-electron-beam-deposited tips from dicobalt-octacarbonyl Co2(CO)8 precursor at 25 keV and varying beam current (20 pA - 3 A) is extensively studied for the first time by means of energy ...

2005

Spectral tunability of realistic plasmonic nanoantennas

Olivier Martin, Christian Santschi

Single nanoantenna spectroscopy was carried out on realistic dipole nanoantennas with various arm lengths and gap sizes fabricated by electron-beam lithography. A significant difference in resonance wavelength between realistic and ideal nanoantennas was f ...

Amer Inst Physics2014

Highly sensitive SERS analysis of the cyclic Arg-Gly-Asp peptide ligands of cells using nanogap antennas

Olivier Martin, Christian Santschi

The cyclic RGD (cRGD) peptide ligands of cells have become widely used for treating several cancers. We report a highly sensitive analysis of c(RGDfC) using surface enhanced Raman spectroscopy (SERS) using single dimer nanogap antennas in aqueous environme ...

2017

Strong Improvement of Long-Term Chemical and Thermal Stability of Plasmonic Silver Nanoantennas and Films

Olivier Martin, Christian Santschi, Xiaolong Wang

Silver (Ag) nanostructures and thin films are advantageous plasmonic materials as they have significantly lower losses than gold (Au). Unfortunately, Ag nanostructures suffer from poor chemical and thermal stability, which limit their applications. Here, t ...

Wiley-V C H Verlag Gmbh2017

New insights into ROS dynamics: a multi-layered microfluidic chip for ecotoxicological studies on aquatic microorganisms

Olivier Martin, Christian Santschi, Volodymyr Koman, Nadia Rachel Von Moos

Reactive oxygen species (ROS) play an important role in the life of every cell, including cellular defense and signaling mechanisms. Continuous and quantitative ROS sensing can provide valuable information about the cell state, but it remains a challenge t ...

Informa Healthcare2016

Two-dimensional electrostatic force field measurements with simultaneous topography measurement on embedded interdigitated nanoelectrodes using a force distance curve based method

Patrik Willi Hoffmann, Christian Santschi

Accurate simultaneous measurements on the topography and electrostatic force field of 500 nm pitch interdigitated electrodes embedded in a thin SiO2 layer in a plane perpendicular to the orientation of the electrodes are shown for the first time. A static ...

AIP American Institute of Physics2008

Pro-oxidant effects of nano-TiO2 on Chlamydomonas reinhardtii during short-term exposure

Olivier Martin, Paul Bowen, Christian Santschi, Lionel André Maurizi, Volodymyr Koman, Nadia Rachel Von Moos

This study sheds light on the short-term dynamics of pro-oxidant processes related to the exposure of C. reinhardtii microalgae to nano-TiO2 using (a) conventional fluorescence probes for cellular pro-oxidant process and (b) a recently developed cytochrome ...

Royal Soc Chemistry2016

Focused Ion Beam: A Versatile Technique for the Fabrication of Nano-Devices

Olivier Martin, Jürgen Brugger, Christian Santschi, Oscar Vazquez Mena

2009

A miniaturized electrochemical biosensor for homocysteine using a screen-printed electrodes with cytochrome c anchored gold nanoparticles

Olivier Martin, Christian Santschi, Madasamy Thangamuthu

2015

Integrated Nickel Micro-Nano-Hall Sensors on SU-8 Cantilevers for Scanning Hall Probe Microscopy

Jürgen Brugger, Giovanni Boero, Christian Santschi, Radivoje Popovic, Oscar Vazquez Mena, Schahrazede-Lila Mouaziz

We report the fabrication and characterization of nickel Hall sensors integrated on SU-8 cantilevers. Sensors having active area down to 1x1 μm 2 show a magnetic field resolution better than 1μT/Hz 1/2 in the thermal noise frequency range. The fabricated d ...

IEEE2007

Fast three-dimensional imaging of gold nanoparticles in living cells with photothermal optical lock-in Optical Coherence Microscopy

Theo Lasser, Christian Santschi, Martin Villiger, Noelia Laura Bocchio, Arno Pino Bouwens, Corinne Berclaz, Joan Goulley, Christophe Pache

We introduce photothermal optical lock-in Optical Coherence Microscopy (poli-OCM), a volumetric imaging technique, which combines the depth sectioning of OCM with the high sensitivity of photothermal microscopy while maintaining the fast acquisition speed ...

Optical Society of America2012

Fabrication and functionalization of nanochannels by electron-beam-induced silicon oxide deposition

Jürgen Brugger, Horst Arthur Vogel, Christian Santschi, Christophe Danelon

We report on the fabrication and electrical characterization of functionalized solid-state nanopores in low stress silicon nitride membranes. First, a pore of approximately 50 nm diameter was drilled using a focused ion beam technique, followed by the loca ...

2006

Micro- and nanostructured devices for investigating biomolecular interactions

Jürgen Brugger, Horst Arthur Vogel, Christian Santschi, Christophe Danelon, Christoph Schreiter, Jean-Baptiste Perez

Cell membrane receptors and ion channels are essential in many different cellular processes. To analyse the activity of membrane proteins in vesicles and biological cells, we fabricated micro- nanostructured chips, enabling the application of electrophysio ...

2006

Measuring the optical absorption of 10 nm gold nanoparticles using multiscattering-enhanced absorption spectroscopy in a dielectric metamaterials

Olivier Martin, Christian Santschi, Volodymyr Koman

2014

Extending the limits of conventional plasmonics with low temperature alloying of noble metals

Olivier Martin, Christian Santschi, Hsiang-Chu Wang, Jeonghyeon Kim, Debdatta Ray

2020

Fabrication of Free-Standing Plasmonic Nanoantennas with Application for Optical Break Junctions

Olivier Martin, Christian Santschi, Banafsheh Abasahl

We report the fabrication of plasmonic nanoantennas with dimensions in the 200 - 300 nm range, suspended across a nano-undercut, which will be used for the investigation of the optical properties of break junctions. Nanochannels, fabricated using e-beam li ...

Ieee2012

High yield and high quality nanofabrication of silver and aluminium plasmonic nanostructures

Olivier Martin, Christian Santschi, Krishnan Thyagarajan

2013