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Demetri Psaltis

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Related publications (271)

Optical-resolution photoacoustic imaging through thick tissue with a thin capillary as a dual optical-in acoustic-out waveguide

Demetri Psaltis, Christophe Moser, Nicolino Stasio, Emmanuel André Henri Bossy

We demonstrate the ability to guide high-frequency photoacoustic waves through thick tissue with a water-filled silica-capillary (150 mu m inner diameter and 30 mm long). An optical-resolution photoacoustic image of a 30 mu m diameter absorbing nylon threa ...

Amer Inst Physics2015

Digital confocal microscopy through a multimode fiber

Alexandre Goy, Demetri Psaltis, Ioannis Papadopoulos, Christophe Moser, Damien Claude-Marie Loterie, Salma Farahi

Confocal laser-scanning microscopy is a well-known optical imaging method where a pinhole is used in the illumination and detection pathways of a normal microscope, in order to selectively excite and detect a particular focal volume. The advantage of this ...

Spie-Int Soc Optical Engineering2015

Delivery of focused short pulses through a multimode fiber

Demetri Psaltis, Christophe Moser, Salma Farahi, Edgar Emilio Morales Delgado

Light propagation through multimode fibers suffers from spatial distortions that lead to a scrambled intensity profile. In previous work, the correction of such distortions using various wavefront control methods has been demonstrated in the continuous wav ...

Optical Soc Amer2015

Vapor-fed microfluidic hydrogen generator

Demetri Psaltis, Christophe Moser, Sophia Haussener, Seyyed Mohammad Hosseini Hashemi, Mikaël Dumortier, Miguel Antonio Modestino

Water-splitting devices that operate with humid air feeds are an attractive alternative for hydrogen production as the required water input can be obtained directly from ambient air. This article presents a novel proof-of-concept microfluidic platform that ...

Royal Society of Chemistry2015

Ablation device and method for subsurface biological tissue ablation

Alexandre Goy, Demetri Psaltis, Thomas Jean Victor Marie Lanvin, Jae-Woo Choi

The present invention relates to a subsurface laser-induced optical breakdown (LIOB) ablation system including an optical source for providing optical pulses and an optical waveguide for guiding the optical pulses to a subsurface target biological tissue s ...

2015

Light control in a multicore fiber using the memory effect

Demetri Psaltis, Christophe Moser, Nicolino Stasio, Donald Benjaman Conkey

Endoscopic imaging through a multicore fiber (MCF) is widely used but is affected by pixelated images, which limits its resolution to a few micrometers. This is due to the spacing between the cores in the MCF, which is large enough to avoid core-to-core li ...

Optical Soc Amer2015

Methods and apparatus for imaging with multimode optical fibers

Demetri Psaltis, Ioannis Papadopoulos, Christophe Moser, Salma Farahi

A multimode waveguide illuminator and imager relies on a wave front shaping system that acts to compensate for modal scrambling and light dispersion by the multimode waveguide. A first step consists of calibrating the multimode waveguide and a second step ...

2015

Design and cost considerations for practical solar-hydrogen generators

Demetri Psaltis, Christophe Moser, Claudia Alejandra Rodriguez Medina, Miguel Antonio Modestino

Solar-hydrogen generation represents a promising alternative to fossil fuels for the large-scale implementation of a clean-fuel transportation infrastructure. A significant amount of research resources has been allocated to the development of photoelectroc ...

Royal Society of Chemistry2014

A micropillar array for sample concentration via in-plane evaporation

Demetri Psaltis, Jae-Woo Choi, Seyyed Mohammad Hosseini Hashemi

We present a method to perform sample concentration within a lab-on-a-chip using a microfluidic structure which controls the liquid-gas interface through a micropillar array fabricated in polydimethylsiloxane between microfluidic channels. The microstructu ...

American Institute of Physics2014

Superhydrophobic bull's-eye for surface-enhanced Raman scattering

Demetri Psaltis, Wuzhou Song

We present a micro-patterned silicon structure that enables the preparation of a substrate for surface-enhanced Raman scattering (SERS) and pre-concentration of the analyte molecules. The structure is designed to produce a hydrophobicity gradient. As a res ...

Royal Society of Chemistry2014

Modified McCannel Iridoplasty Simulating Basal Iridectomy for Silicone Oil Tamponade in Aphakia and Partial Aniridia

Demetri Psaltis, François Gallaire

Georg Thieme Verlag2014

Cytoplasmic Stopped Flow at the Single Cell Level Based on Photosensitive Polymersomes

Jeffrey Alan Hubbell, Conlin O'Neil, Demetri Psaltis, Andreas Vasdekis

Cell Press2014

Solar thermal harvesting for enhanced photocatalytic reactions

Demetri Psaltis, Jae-Woo Choi, Seyyed Mohammad Hosseini Hashemi

The Shockley-Queisser limit predicts a maximum efficiency of 30% for single junction photovoltaic (PV) cells. The rest of the solar energy is lost as heat and due to phenomena such as reflection and transmission through the PV and charge carrier recombinat ...

Royal Society of Chemistry2014

Imaging blood cells through scattering biological tissue using speckle scanning microscopy

Demetri Psaltis, Ye Pu, Xin Yang, Ye Pu

We demonstrate imaging of blood cells enclosed in chicken skin tissue using speckle scanning microscopy (SSM). Clear images of multiple cells were obtained with subcellular resolution and good image fidelity, provided that the object dimension was smaller ...

Optical Society of America2014

High-resolution, lensless endoscope based on digital scanning through a multimode optical fiber

Demetri Psaltis, Christophe Moser, Salma Farahi

We propose and experimentally demonstrate an ultra-thin rigid endoscope (450 mu m diameter) based on a passive multimode optical fiber. We use digital phase conjugation to overcome the modal scrambling of the fiber to tightly focus and scan the laser light ...

Optical Soc Amer2013

Optical-resolution photoacoustic microscopy by use of a multimode fiber

Demetri Psaltis, Christophe Moser, Salma Farahi, Emmanuel André Henri Bossy

We demonstrate Optical-Resolution Photoacoustic Microscopy (OR-PAM), where the optical field is focused and scanned using Digital Phase Conjugation through a multimode fiber. The focus is scanned across the field of view using digital means, and the acoust ...

American Institute of Physics2013

Increasing the imaging capabilities of multimode fibers by exploiting the properties of highly scattering media

Demetri Psaltis, Christophe Moser, Salma Farahi

We present a design that exploits the focusing properties of scattering media to increase the resolution and the working distance of multimode fiber (MMF)-based imaging devices. Placing a highly scattering medium in front of the distal tip of the MMF enabl ...

Optical Society of America2013

Digital holographic confocal microscope

Alexandre Goy, Demetri Psaltis

We demonstrate experimentally a scanning confocal microscopy technique based on digital holographic recording of the scanned spot. The data collected in this way contains all the information to produce three-dimensional images. Several methods to treat the ...

Spie-Int Soc Optical Engineering2013

Tissue and cellular imaging

Demetri Psaltis, Chia-Lung Hsieh, Ye Pu, Xin Yang, Ye Pu

Systems and methods for imaging ear tissue include: directing illumination radiation to pass through an intact biological structure and be incident on ear tissue that does not include an exogenous fluorophore, at a plurality of locations, the illumination ...

2013

Multiple contrast metrics from the measurements of a digital confocal microscope

Michaël Unser, Alexandre Goy, Demetri Psaltis

We describe various methods to process the data collected with a digital confocal microscope (DCM) in order to get more information than what we could get from a conventional confocal system. Different metrics can be extracted from the data collected with ...

Optical Soc Amer2013

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