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Electric field distributions of resonant modes in a photonic crystal nanocavity were imaged using atomic force microscope nano-oxidation. A grid pattern of nano-size oxides was grown on the nanocavity to perturb the resonant modes. The perturbation caused a shift in the resonant wavelength that was proportional to the local electric field intensity of the resonant mode. The experimentally obtained...
We design a quasi-L2 (qL2) photonic crystal nano-cavity (PCN), which has a very small mode volume Vm of 1.6(λ/2n)3 and a reasonably high Q value of 15,000 theoretically. By manipulating the radii of air holes, the mode spacing is extended and a single defect mode operation within the gain spectrum of InAs QDs is achieved. A room temperature operation InAs QDs PCN laser with an ultra-low threshold...
We demonstrate direct-coupling of vertical-cavity surface-emitting lasers to suspended-core PCFs and present characterization of this gas sensor. The spectral background and power-overlap from 763-2004 nm are measured to determine the quantitative detection sensitivity.
In this work we show how the dispersion relation of slab-type PhCs can be directly determined both in the radiative and guided mode regimes by means of k-space spectroscopy. Angle-resolved reflectance, attenuated total reflectance and micro-photoluminescence spectroscopy are used to determine several important characteristics like band-edge dispersion, slow-light propagation or far-field intensity...
We present experimental measurements on silicon-on-insulator (SOI) photonic crystal slabs with an active layer containing Er3+ ions-doped silicon nanoclusters (Si-nc), showing strong enhancement of 1.54 mum emission at room temperature. We provide a systematic theoretical analysis to interpret such results. In order to get further insight, we discuss experimental data on the guided luminescence of...
In this work we present preliminary results on the optical response and sensitivity tests of waveguide-based photonic crystal structures acting as biosensors for proteins and oligonucleotides. Several one-and two-dimensional Silicon-on-insulator (SOI) PhCs with lattice constants in the submicron range have been realized by means of electron-beam lithography and reactive ion etching techniques.
Polarizations of light emissions from single In0.5Ga0.5As quantum dots (QDs) in photonic crystal (PC) nanocavities were studied. It is found that an individual dot could excite different polarization direction when placed in the PC nanocavity with doubly degenerated cavity modes. On the contrary, a deterministic polarization state of QD emission is found when coupled to a single-mode PC nanocavity.
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