Publications by Zhaolu Diao | EPFL Graph Search

Continuous-wave vertically emitting photonic crystal terahertz laser

Romuald Houdré, Jérôme Faist, Christopher Bonzon, Zhaolu Diao

Compact semiconductor light sources with high performance continuous-wave (CW) and single mode operation are highly demanded for many applications in the terahertz (THz) frequency range. Distributed feedback (DFB) and photonic crystal (PhC) quantum cascade ...

Wiley-VCH Verlag Berlin2013

Observation of Backaction and Self-Induced Trapping in a Planar Hollow Photonic Crystal Cavity

Romuald Houdré, Ulagalandha Perumal Dharanipathy, Zhaolu Diao, Nicolas Maxime André Descharmes, Mario Lucien Henri Tonin

The optomechanical coupling between a resonant optical field and a nanoparticle through trapping forces is demonstrated. Resonant optical trapping, when achieved in a hollow photonic crystal cavity is accompanied by cavity backaction effects that result fr ...

American Physical Society2013

Single particle detection, manipulation and analysis with resonant optical trapping in photonic crystals

Romuald Houdré, Ulagalandha Perumal Dharanipathy, Zhaolu Diao, Nicolas Maxime André Descharmes, Mario Lucien Henri Tonin

We demonstrate a resonant optical trapping mechanism based on two-dimensional hollow photonic crystal cavities. This approach benefits simultaneously from the resonant nature and unprecedented field overlap with the trapped specimen. The photonic crystal s ...

Royal Society of Chemistry2013

Self-trapping and back-action effects in hollow photonic crystal cavity optical trap

Romuald Houdré, Ulagalandha Perumal Dharanipathy, Zhaolu Diao, Nicolas Maxime André Descharmes, Mario Lucien Henri Tonin

We report on the first experimental demonstration of resonant optical trapping of dielectric particles in a two-dimensional hollow photonic crystal cavity. The cavities are implemented in an optofluidic chip consisting of a silicon-on-insulator substrate a ...

Spie-Int Soc Optical Engineering2013

Investigation of 2D Photonic Crystals and Their Applications on Terahertz Quantum Cascade Lasers, Optical Trapping and Sensing

Zhaolu Diao

EPFL2013

Near-infrared characterization of gallium nitride photonic-crystal waveguides and cavities

Jean-François Carlin, Romuald Houdré, Nicolas Grandjean, Ulagalandha Perumal Dharanipathy, Noelia Vico Triviño, Zhaolu Diao

We report the design and optical characterization of fully suspended wire waveguides and photonic crystal (PhC) membranes fabricated on a gallium nitride layer grown on silicon substrate operating at 1.5 mu m. W1-type PhC waveguides are coupled with suspen ...

Optical Society of America2012

Microfluidic integrated hollow photonic crystal cavities for single particle and resonant field interaction

Romuald Houdré, Ulagalandha Perumal Dharanipathy, Zhaolu Diao, Nicolas Maxime André Descharmes

A microfluidic-integrated single particle sensor based on hollow photonic crystal cavities is reported. The interaction relies on the reversible resonance frequency shift induced by a dielectric particle near the cavity. ...

Ieee2012

Surface emitting Terahertz Photonic Crystal Quantum Cascade Laser realized by Bragg boundary condition

Romuald Houdré, Jérôme Faist, Christopher Bonzon, Zhaolu Diao

We theoretically and experimentally investigate a band edge Photonic Crystal (PhC) Quantum Cascade Laser (QCL) operating at 3.1 THz. The surface emission is achieved by using a second-order Bragg grating at the PhC tile boundaries. Highly directional surfa ...

Ieee2012

Statistical analysis of subnanometer residual disorder in photonic crystal waveguides: Correlation between slow light properties and structural properties

Romuald Houdré, Nicolas Le Thomas, Hua Zhang, Zhaolu Diao

The authors present a statistical study of residual disorder in nominally identical planar photonic crystal waveguides operating in the slow light regime. The focus is on the role played by the subnanometer scaled residual disorder inherent to state-of-the ...

2011

Refractive Index Gas Sensing in a Hollow Photonic Crystal Cavity

Romuald Houdré, Nicolas Le Thomas, Hua Zhang, Jana Jágerská, Zhaolu Diao

We investigate hollow photonic crystal structures consisting in air-slot photonic crystal nanocavities. The high quality factor similar to 2.6x10(4) of such cavities along with a strong overlap between the resonant mode and the hollow core region allows fo ...

Ieee2011

Refractive index sensing with an air-slot photonic crystal nanocavity

Romuald Houdré, Nicolas Le Thomas, Hua Zhang, Jana Jágerská, Zhaolu Diao

We investigate an air-slot photonic crystal cavity for high-precision refractive index sensing. The high quality factor ∼2:6 × 10^4 of the cavity, along with a strong overlap between the resonant mode and the hollow core region, allows us to achieve an exp ...

Optical Society of America2010