152 research outputs found
InP membrane technology for photonics electronics convergence
InP membrane on silicon (IMOS) technology has shown high potential in realizing high-density photonic circuits with speed and energy benefits. Intrinsic active components offered by the InP membrane promise highest optoelectronic efficiencies. It can also be intimately integrated on electronics wafers with ultrashort interconnect lengths, paving a way towards the convergence of photonics and electronics
Broadband multifunctional plasmonic polarization converter based on multimode interference coupler
We propose a multifunctional integrated plasmonic–photonic polarization converter for polarization demultiplexing in an indium-phosphide membrane on silicon platform. By using a compact 1 × 4 multimode interference coupler, this device can provide simultaneous half-wave plate (HWP) and quarter-wave plate (QWP) functionalities. Our device employs a two-section HWP to obtain a very large conversion efficiency of ≥ 91% over the entire C to U telecom bands, while it offers a conversion efficiency of ≥ 95% over ∼ 86% of the C to U bands. Our device also illustrates QWP functionality, where the transmission contrast between the transverse electric and transverse magnetic modes is ≈ 0 dB over the whole C band and 55% of the C to U bands. Using this functionality, our device generates two quasi-circular polarized beams with opposite spins and topological charges of l=±1, based on only one input polarization, and one incoming light beam direction. We expect that this device can be a promising building block for the realization of ultracompact on-chip polarization demultiplexing and lab-on-a-chip biosensing platforms. Finally, our proposed device allows the use of the polarization and angular momentum degrees of freedom, which makes it attractive for quantum information processing.</p
Miniaturization of 90-degree hybrid optical couplers
Here we explore the limits of miniaturization of an efficient 90-degree hybrid coupler on the InP photonic integration platform, working in the L, C and S bands, with respect to their figures of merit. We investigate the main effects responsible for the degradation of the performance of the devices, and establish the minimal dimension that such devices can have without significant degradation for photonic applications. The miniaturized device has a footprint of only 2200µm2, more than 5 times smaller than the conventional device used as reference
Miniaturization of 90-degree hybrid optical couplers
Here we explore the limits of miniaturization of an efficient 90-degree hybrid coupler on the InP photonic integration platform, working in the L, C and S bands, with respect to their figures of merit. We investigate the main effects responsible for the degradation of the performance of the devices, and establish the minimal dimension that such devices can have without significant degradation for photonic applications. The miniaturized device has a footprint of only 2200µm2, more than 5 times smaller than the conventional device used as reference
Integrated polarization filter for 1550 nm based on a narrow waveguide section
The polarization filter that is presented in this publication is based on a narrow deepetched waveguide. The measured suppression of the TE mode is 20 dB. The achievedbandwidth is larger than 130nm (limited by the setup). The filter width for an operatingrange around 1550 nm is 0.5 μ
High-efficiency ultrasmall polarization converter in InP membrane
An ultrasmall (99% with insertion losses o
Optical Reading of Nanoscale Magnetic Bits in an Integrated Photonic Platform
In this paper, we propose a compact integrated hybrid plasmonic-photonic
device for optical reading of nanoscale magnetic bits with perpendicular
magnetic anisotropy in a magnetic racetrack on top of a photonic waveguide on
the indium phosphide membrane on silicon platform. The hybrid device is
constructed by coupling a doublet of V-shaped gold plasmonic nanoantennas on
top of the indium phosphide waveguide. By taking advantage of the localized
surface plasmons, our hybrid device can enable detection of the magnetization
state in magnetic bits beyond the diffraction limit of light and enhance the
polar magneto-optical Kerr effect (PMOKE). We further illustrate how combining
the hybrid device with a plasmonic polarization rotator provides
magneto-optical read-out by transforming the PMOKE-induced polarization change
into an intensity variation of the waveguide mode. According to the simulation
results based on a three-dimensional finite-difference time-domain method, the
hybrid device can detect the magnetization states in targeted bits in a
magnetic racetrack medium down to ~ 100x100 nm2, regardless of the
magnetization state of the rest of the racetrack with a relative intensity
contrast of greater than 0.5% for a ~ 200x100 nm2 magnetic bit. We believe our
hybrid device can be an enabling technology that can connect integrated
photonics with nanoscale spintronics, paving the way toward ultrafast and
energy efficient advanced on-chip applications
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