The performance of bio-chemical sensing devices has been greatly improved by the development of surface plasmon resonance (SPR) based sensors. Advancements in micro- and nano-fabrication technologies have led to a variety of structures in SPR sensing systems being proposed. In this review, SPR sensors (from typical Kretschmann prism configurations to fiber sensor schemes) with micro- or nano-structures for local light field enhancement, extraordinary optical transmission, interference of surface plasmon waves, plasmonic cavities, etc. are discussed. We summarize and compare their performances and present guidelines for the design of SPR sensors.
Long-wavelength photoluminescence at 1.35 μm has been measured from an InGaAs quantum-well heterostructure deposited on disk-shaped InGaAs (xIn=0.05) compliant-film membranes. Strain-induced warping is avoided by utilizing a single pedestal to suspend each compliant-film disk over a GaAs substrate. Cathodoluminescence (CL) spectra verify the long-wavelength emission, and panchromatic CL images reveal that strong emission occurs only on compliant film structures supported by 1-μm-diam pedestals.
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