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Demetri Psaltis

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Publications associées (271)

Seeing through turbidity with harmonic holography [Invited]

Demetri Psaltis, Ye Pu, Ye Pu

The ability to see inside the body noninvasively is indispensable in modern biology and medicine. Optical approaches to such abilities are of rapidly growing interest because of their nonionizing nature and low cost. However, the problem of opacity due to ...

Optical Soc Amer2013

Two-photon microscopy of the mouse cochlea in situ for cellular diagnosis

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

Sensorineural hearing loss is the most common type of hearing loss worldwide, yet the underlying cause is typically unknown because the inner ear cannot be biopsied today without destroying hearing, and intracochlear cells have not been imaged with resolut ...

SPIE Society of Photo-optical Instrumentation Engineers2013

Focused light delivery and all optical scanning from a multimode optical fiber using digital phase conjugation

Demetri Psaltis, Christophe Moser, Salma Farahi

We demonstrate a digital phase conjugation technique for generating a sharp focus point at the end of a multimode optical fiber. A sharp focus is experimentally obtained at the distal end of a 200 mu m core multimode fiber. By recording the digital hologra ...

Spie-Int Soc Optical Engineering2013

Dynamic bending compensation while focusing through a multimode fiber

Demetri Psaltis, David Ziegler, Christophe Moser, Salma Farahi

Multimode fiber endoscopes have recently been shown to provide sub-micrometer resolution, however, imaging through a multimode fiber is highly sensitive to bending. Here we describe the implementation of a coherent beacon source placed at the distal tip of ...

Optical Society of America2013

Electrically tunable optofluidic light switch for reconfigurable solar lighting

Demetri Psaltis, Wuzhou Song

We describe a reconfigurable lighting system for indoor solar illumination which provides a new way for solar energy conservation. We have experimentally demonstrated an electrically tunable optofluidic light switch which takes the key role for the reconfi ...

Royal Society of Chemistry2013

Vesicle Photonics

Jeffrey Alan Hubbell, Demetri Psaltis, Andreas Vasdekis, Sylvie Roke

Amphiphiles, under appropriate conditions, can self-assemble into nanoscale thin membrane vessels (vesicles) that encapsulate and hence protect and transportmolecular payloads.Vesicles assemble naturally within cells but can also be artificially synthesize ...

Annual Reviews2013

Optofluidic-tunable color filters and spectroscopy based on liquid-crystal microflows

Julien Cuennet, Demetri Psaltis, Andreas Vasdekis

The integration of color filters with microfluidics has attracted substantial attention in recent years, for on-chip absorption, fluorescence, or Raman analysis. We describe such tunable filters based on the micro-flow of liquid crystals. The filter operat ...

Royal Society of Chemistry2013

Optofluidic light switch enables reconfigurable solar lighting

Demetri Psaltis, Wuzhou Song

Pennwell Publ Co2013

Double-helix enhanced axial localization in STED nanoscopy

Demetri Psaltis, Andreas Vasdekis, Grégoire Pierre Jean Laporte, Donald Benjaman Conkey

Stimulated Emission Depletion (STED) microscopy enables subdiffraction resolution in the imaging plane. However, STED's lateral improvement in resolution is generally better than the enhancement in the axial direction. Here, we combine conventional STED su ...

Optical Society of America2013

Focusing and scanning light through a multimode optical fiber using digital phase conjugation

Demetri Psaltis, Christophe Moser, Salma Farahi

We demonstrate for the first time to our knowledge a digital phase conjugation technique for generating a sharp focus point at the end of a multimode optical fiber. A sharp focus with a contrast of 1800 is experimentally obtained at the tip of a 105 mu m c ...

2012

Three-dimensional scanning microscopy through thin turbid media

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

We demonstrate three-dimensional imaging through a thin turbid medium using digital phase conjugation of the second harmonic signal emitted from a beacon nanoparticle. The digitally phase-conjugated focus scans the volume in the vicinity of its initial pos ...

2012

Three-Dimensional Mapping of Transparent Objects Using Kerr Nonlinearity Measurement

Alexandre Goy, Demetri Psaltis

We report a technique to produce three-dimensional maps of transparent objects using the Kerr coefficient as a contrast agent. The method is based on the spatial modifications of a probe pattern focused into the medium. (C) 2010 Optical Society of America ...

Ieee2012

Holographic coherent anti-Stokes Raman scattering bio-imaging

Demetri Psaltis

CARS holography captures both the amplitude and the phase of a complex anti-Stokes field, and can perform three-dimensional imaging by digitally focusing onto different depths inside a specimen. The application of CARS holography for bio-imaging is demonst ...

2012

Digital confocal microscope

Alexandre Goy, Demetri Psaltis

We demonstrate experimentally a scanning confocal microscopy technique based on digital holography. The method relies on digital holographic recording of the scanned spot. The data collected in this way contains all the necessary information to digitally p ...

Optical Society of America2012

Precision Intracellular Delivery Based on Optofluidic Polymersome Rupture

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

We present an optical approach for intracellular delivery of molecules contained within oxidation-sensitive polymersomes. The photosensitizer ethyl eosin is associated with the polymersome membrane to oxidatively increase the hydrophilicity of the hydropho ...

American Chemical Society2012

Elastomer based tunable optofluidic devices

Demetri Psaltis, Andreas Vasdekis, Wuzhou Song

The synergetic integration of photonics and microfluidics has enabled a wide range of optofluidic devices that can be tuned based on various physical mechanisms. One such tuning mechanism can be realized based on the elasticity of polydimethylsiloxane (PDM ...

Royal Society of Chemistry2012

IMAGING The fog clears

Demetri Psaltis

A technique has been developed to image a fluorescent object hiding behind a light-scattering screen without the need for a detector behind the screen. The approach could find applications in imaging biological tissue. ...

Nature Publishing Group2012

Light filter and method for using such filter

Julien Cuennet, Demetri Psaltis, Andreas Vasdekis

The invention concerns a light filter comprising a plate defined by a length along a direction x, a width along a direction y and a height along a direction z said plate including at least one chamber containing Liquid Crystals (LC) molecules and which is ...

2012

Coherent Anti-Stokes Raman Scattering Holography: Theory And Experiment

Demetri Psaltis

We review coherent anti-Stokes Raman scattering (CARS) holography as a non-scanning, label-free, three-dimensional imaging technique. The theory of CARS and its integration with digital holography is explored. We then discuss the experimental implementatio ...

World Scientific Publishing2012

Imaging based interferometric pressure sensor

Demetri Psaltis, Wuzhou Song

An imaging based interferometric pressure sensor apparatus compromise a fluid pressure sensor unit (1) and an optical monitor (2). The disposable pressure sensor part comprises a rigid transparent cover plate 3 and a flexible diaphragm (4), in between form ...

2011

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