Holographic lithography provides a highly compatible and facile way to fabricate multi-dimensional periodic
nanostructures. Periodic nanostructures have useful applications not only as biological substrates or catalytic supports
but also as nanophotonic devices with various photonic properties such as photonic band-gap (PBG), localized surface
plasmon resonance (LSPR) or surface enhanced Raman scattering (SERS). In combination with single refracting prism
holographic lithography and conventional photolithography, we could achieve the micrometer-scale patterns of periodic
nanostructures which can be integrated in microfluidic chip. With the help of conventional MEMS technologies, Arrays
of pyramid shape and top-cut pyramid shape microprism can be prepared. Single laser exposure step through the
microprism arrays (MPAs) can be generate multiscale patterns of 2D and 3D nanostructures. As prepared nanostructures
combined with microfluidic chip is a highly efficient optofluidic platform which is applicable to the chemical and biosensors.
We propose and demonstrate a new type of a photonic crystal nanolaser integrated into a microfluidic chip, which
is fabricated by multilayer soft lithography. Experimentally, continuous-wave operation of the lasing action has
been observed owing to efficient water-cooling. Characteristics of wavelength tuning by the fluid are investigated
using both theory and experiment. In addition, we propose that dynamic modulation of far-field radiation
pattern can be achieved by introducing a bottom reflector and by flowing the fluid on it. Especially, by choosing
effective one-wavelength distance between the reflector and the cavity, efficient unidirectional emission can be
obtained.
In this paper, we report a fast and facile method for fabricating colloidal photonic crystals inside microchannels of radially symmetric microfluidic chips. As the suspension of monodisperse silica or polystyrene latex spheres was driven to flow through the channels under the centrifugal force, the colloidal spheres were quickly assembled into face centered cubic arrangement which had photonic stop bands. The optical reflectance spectrum was modulated by the refractive-index mismatch between the colloidal particles and the solvent filled in the interstices between the particles. Therefore, the present microfluidic chips with built-in colloidal photonic crystals can be used as in-situ optofluidic microsensors for high throughput screening, light filters and biosensors in integrated adaptive optical devices.
In this paper, we report a fast and facile method for fabricating colloidal photonic crystals inside microchannels of
radially symmetric microfluidic chips. As the suspension of monodisperse silica or polystyrene latex spheres was driven
to flow through the channels under the centrifugal force, the colloidal spheres were quickly assembled into face centered
cubic arrangement which had photonic stop bands. The optical reflectance spectrum was modulated by the refractiveindex
mismatch between the colloidal particles and the solvent filled in the interstices between the particles. Therefore,
the present microfluidic chips with built-in colloidal photonic crystals can be used as in-situ optofluidic microsensors for
high throughput screening, light filters and biosensors in integrated adaptive optical devices.
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