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We report on the first experimental demonstration of a resonant optical trap in a two-dimensional hollow photonic crystal cavity. Resonant trapping is implemented in an optofluidic silicon chip. Individual 250 and 500 nm polystyrene particles are trapped using optical powers of the order of 100 µW. Local refractive index perturbation associated with the particle presence lead to modifications of the...
Surface emitting semiconductor lasers in the terahertz frequency range are highly demanded for spectroscopy, imaging, security and other applications. Due to their compactness and high power, Quantum Cascade Lasers (QCLs) are one of the most important laser sources in this region. The selection rule of intersubband transitions forces the radiation to be TM polarized and thus generated in-plane, consequently...
The inherent diffraction limited nature of classical optical tweezers [1] prevents their use for the trapping of particles smaller than a few hundred nanometres. Recent progresses in nanofabrication have facilitated the emergence of integrated devices capable of confining light beyond Abbes limit. This subwavelength confinement gives rise to large field gradients capable of generating unprecedented...
The first experimental demonstration of resonant optical trapping of dielectric particles in a hollow photonic crystal cavity is reported. The existence of mutual interaction between the confined field and the particle is revealed.
We demonstrate a functional microfluidic hollow photonic crystal cavity chip for single particle detection and optical manipulation. The use of a very thin PDMS membrane atop hollow photonic crystal cavities devices allows accurate monitoring of in-situ cavity-particle interaction as well as particle manipulation simultaneously. The dynamic resonance frequency shift of a particle inside the cavity...
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.
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 surface emitting far-field patterns are observed.
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