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A highly sensitive biosensor based on a silicon photonic crystal waveguide incorporating microcavities is investigated using two-dimensional Finite Difference Time Domain method. With a microcavity placed near the waveguide, a dip is observed on the waveguide transmission spectrum, corresponding to the resonance wavelength of the cavity. Any change of the medium surrounding to the waveguide and cavity...
We demonstrate that PMMA upper cladding on the slotted silicon micoring resonators can reduce the resonance thermal dependence from 91 pm/deg to 27 pm/degC. UV trimming can shift the resonance wavelength 0.5 nm.
Colloidal PbSe quantum dots (QDs) are site-selectively bound to silicon-based L3 photonic crystal cavities through a robust process consisting of AFM-lithography and surface chemistry techniques. High-contrast cavity-mode emission is observed, indicating good cavity-QDs coupling.
We demonstrate enhanced photoluminescence from silicon nanocrystals using a DBR microcavity. We also show a candidate electroluminescent device which can be embedded into a similar DBR cavity for enhancement.
The combination of Si-based ultra-high Q micro-resonators and ultra-compact photonic crystal on-chip spectrometers has enabled highly-sensitive lab-on-a-chip sensing structures with orders-of-magnitude smaller size compared to conventional bulk sensing systems. Details of the design along with their experimental demonstrations will be presented.
We study the enhanced light emission from a silicon slab with a photonic crystal nanocavity. We find that phonon accumulation in the tiny space is a key for enhanced light emission in addition to the cavity effect for photons.
We report the room temperature enhancement of direct bandgap emission from germanium microcavities with wavelength-scale dimensions and high optical confinement. A decline in the emission enhancement with lower Qs is attributed to the Purcell effect.
We demonstrate light transmission from a photonic crystal nano-cavity into a planer photonic crystal waveguide. Enhanced photo-luminescence at a cavity resonant wavelength is observed from the cleaved facet of a waveguide with strong position dependence.
We use a patterned conformal deposition technique to fabricate Si-based 3D optical microcavities. The size-dependent confined photonic modes were observed when the size is reduced to 1.0 mum which is similar to the quantum effect of electronic states in semiconductor quantum dots.
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