1,721,096 research outputs found
a-Si waveguides and light modulators for integrated photonics realized by low-temperature plasma enhanced chemical vapour deposition.
No full textA new amorphous silicon waveguide is realized by use of amorphous silicon carbon as cladding material. The structure is characterized both experimentally and theoretically, and its application for optical interconnections in photonic integrated circuits on silicon motherboards is proposed. The fabrication process is based on low-temperature (220°C) plasma-enhanced chemical-vapor deposition and is compatible with standard microelectronic processes. Propagation losses of 1.8 dB/cm have been measured at the fiber-optic wavelength of 1.3 μm. A strong thermo-optic coefficient has been measured in this material at this wavelength and exploited for the realization of a light-intensity modulator based on a Fabry—Perot interferometer that is tunable by temperature
Silicon resonant cavity enhanced photodetector based on the internal photoemission effect at 1.55 μm: Fabrication and characterization
No full textFast light switching in an a-SI:H-based micro-optic device for fiber-in-the-loop applications
No full textThermo-optical Modulation at λ=1.5 mm in an a-SiC/a-Si/a-SiC Planar Guided-Wave Structure
No full textA planar waveguide based on an amorphous silicon-amorphous silicon carbide heterostructure is proposed for the realization of passive and active optical components at the wavelengths /spl lambda/=1.3-1.5 /spl mu/m. The waveguide has been realized by low temperature plasma enhanced chemical vapor deposition and is compatible with the standard microelectronic technologies. Thermo-optical induced modulation at /spl lambda/=1.5 /spl mu/m is demonstrated in this waveguide. Numerical simulations predict that operation frequencies of about 3 MHz are possible. The measurements have also allowed the determination of the previously unknown thermo-optical coefficient of undoped amorphous silicon at this wavelength
Feasibility of an all-optical switch based on cylindrical microresonators and liquid crystals
No full textA microfluidics assisted porous silicon array for optical label-free biochemical sensing
No full textA porous silicon (PSi) based microarray has been integrated with a microfluidic
system, as a proof of concept device for the optical monitoring of selective labelfree
DNA-DNA interaction. A 44 square matrix of PSi one dimensional
photonic crystals, each one of 200 lm diameter and spaced by 600 lm, has been
sealed by a polydimethylsiloxane (PDMS) channels circuit. The PSi optical
microarray elements have been functionalized by DNA single strands after sealing:
the microfluidic circuit allows to reduce significantly the biologicals and chemicals
consumption, and also the incubation time with respect to a not integrated device.
Theoretical calculations, based on finite element method, taking into account
molecular interactions, are in good agreement with the experimental results, and
the developed numerical model can be used for device optimization. The
functionalization process and the interaction between DNA probe and target has
been monitored by spectroscopic reflectometry for each PSi element in the
microchannels
Measurement of the thermo-optic coefficient of a-Si:H at the wavelength of 1500 nm from room temperature to 250 °C
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