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We analyze how a probing particle modifies the infrared electromagnetic near field of a sample. The particle, described by electric and magnetic polarizabilities, represents the tip of an apertureless scanning optical near-field microscope (SNOM). We show that the interaction with the sample can be accounted for by ascribing to the particle dressed polarizabilities that combine the effects of image...
Scattering-type near-field optical microscopy (sNSOM) allows one to map the propagation of purely evanescent waves such as surface plasmons polaritons (SPPs). We have recently used it to image SPPs generated electrically at the surface of a mid-infrared (MIR) quantum cascade laser (QCL) including all the building blocks for an integrated active plasmonic device [1]. This talk will report on sNSOM...
A surface plasmon polariton (SPP) mode is directly excited on a metal/air interface using an integrated mid-infrared (MIR) quantum cascade laser. We demonstrate the SPP generation and propagation via far-field and near-field MIR imaging. We also demonstrate bending and focusing of MIR surface-plasmons using a sub-wavelength metal patterning.
We present a basic building block for the realization of integrated active plasmonic devices: a distributed-feedback semiconductor laser working at room temperature and λ=1.3μm obtained with metal patterning on a thinned top cladding.
We demonstrate pulsed, room-temperature operation of single-mode surface-plasmon distributed-feedback quantum cascade lasers operating at lambdaap7.5 mum. The grating is implemented via the sole patterning of the top metallic contact. The presence of the grating yields an important loss reduction with respect to unpatterned surface-plasmon devices.
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