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We demonstrate the working principle of a silicon-based all-optical half-adder using AND-XOR Boolean logic. Ultrafast switching speeds are achieved by applying the Kerr effect to hydrogenated amorphous silicon microring resonators.
Measuring force and displacement in some environments is not a straight forward task. For example, in the presence of flammable materials or when surgery robots are dealing with human body, force and displacement sensors should be redesigned for this use. In surgical applications, the sensors have to be electrically passive and EMI compatible. Many kinds of sensors have been introduced for this application,...
We compare the temperature rise due to solar heating in GaAs nanowire solar cells to planar cells. We find that despite more highly concentrated light absorption and reduced thermal conductivity, the overall temperature rise in nanowire structures is lower than in planar structures. Moreover, coating the nanowires with a transparent conductive polymer with high absorption at thermal wavelengths can...
A new technique, based on fiber laser technology for the detection of trace gases, was developed. An erbium-doped fiber was used as the gain medium. The sensitivity of the system was explored based on the length of the gas cell, which was used inside the cavity. The system was capable of detecting gases at sub-ppm concentration levels.
Due to its lithium ion intercalation capability, vanadium pentoxide is extensively studied for applications such as electrode material for pseudocapacitors, electrochromic devices, and cathodes in high capacity lithium ion batteries. Vanadium oxide has a layered structure and, in order to enhance lithium ion intercalation, templating methods are proposed in this work to create porosity in the film...
By embedding a single quantum emitter inside a nanoresonator that strongly localizes optical field, it is possible to achieve a very strong light-matter interaction. The strength of this interaction is characterized by the coherent emitter-field coupling strength (g), which increases with reduction in the optical mode volume and which also sets the limit on the operational speed of such a system....
We propose a polarization rotator design based on an asymmetrical periodic loaded waveguides on SOI platforms. The device features high conversion efficiency. The fabrication is CMOS compatible with a two-step lithography etching.
We present a new critical platform for active highspeed plasmonic devices based on nonreciprocal phase effects in magnetic dielectrics. In addition, we demonstrate a method of generating plasmonic field maps with ∼ 1nm resolution.
In this work, we show how deviations caused by fabrication processes impact the functionality of photonic components and the importance of taking this into account in the design and simulation procedure. Moreover, we give examples of how design and simulation of photonic integrated circuits (PIC) can be optimized to relax fabrication requirements.
We demonstrate theoretically a silicon resonator reflector, having no free spectral range, using a distributed Bragg reflector and a contra-directional grating coupler. The spectral response of the device meets numerous commercial specifications for a clear window of 5 GHz and a channel spacing of 100 GHz.
The experimental reconstruction of phase and amplitude distributions of highly confined light fields is of utmost importance for a multitude of scientific research areas. Here, we present a particle-based experimental approach and reconstruction algorithm for the fully vectorial field reconstruction and discuss its applications. This method allows for reconstruction with deep sub-wavelength resolution...
The first commercial thermal scanning probe lithography tool is used for patterning of single- and bi-level surface-relief gratings. A modified tri-layer pattern transfer process is proposed to facilitate the fabrication of bi-level gratings.
Digital coherent receivers are essential to the attainment of high spectral efficiency in high capacity fiber-optic transmission. Coherent receivers detect both amplitude and phase of the optical field, which permits the use of advanced modulation formats by the transmitter. A real-time coherent optical receiver using Digital Signal Processing (DSP) enables the transmission system to perform dispersion...
This paper provides numerical results of an ultra-compact high pass wavelength filter based on stub structure in a MIM waveguide. Transmission spectra can be easily tuned by adjusting distance between two edges of the stub.
Explosive growth in internet traffic has prompted huge interest in the area of all-optical signal processing. It can provide much higher data rates at much lower heat dissipation as compared to electronics. Wavelength conversion is an important aspect of all-optical signal processing, since it enables adding, dropping, multiplexing and de-multiplexing of WDM channels. All-optical wavelength conversion...
This paper focuses on the design and experiments of Ge/SiGe QW waveguide modulators integrated on Ge-rich GeSi waveguide. This new photonic integration approach allows high bandwidth Ge-based active optical circuitry to be realized on bulk Si wafer at low temperature.
Nonlinear cavity optomechanics is a promising platform for realizing experiments which reveal the quantum properties of nanomechanical structures. Here we introduce an optomechanical system combining strong nonlinear optomechanical coupling, low mass and large optical mode spacing. This nanoscale “paddle nanocavity” supports mechanical resonances with hundreds of fg mass which couple nonlinearly to...
We address the potential of a nonuniform coupled waveguides system with gain and loss featuring a PT-symmetry configuration for the realization of switching and dynamic memory applications based on a non-reciprocal modal behavior. The possibility for a perfect switching operation in such a nonconservative layout combining loss and gain is demonstrated.
We report on the significant role of silver ions during femtosecond laser-induced formation of nanogratings (NGs) at the surface of high optical quality gallophosphate glasses that we develop. Compared to the non-doped glass matrix, the silver-containing glass showed remarkable silver-dependent behaviors, namely lower fluence thresholds of NGs formation and higher NGs quality with much smoother shapes...
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