A5054170097- Photonic and Optical Devices
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Semiconductor Quantum Structures and Devices
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Laser Technologies
- Photonic Crystals and Applications
- Mechanical and Optical Resonators
- Plasmonic and Surface Plasmon Research
- Advanced Fiber Optic Sensors
- Optical Coatings and Gratings
- Silicon Nanostructures and Photoluminescence
- Magneto-Optical Properties and Applications
- Nanowire Synthesis and Applications
- Quantum optics and atomic interactions
- Analytical Chemistry and Sensors
Nanyang Technological University
2015-2019
Université Paris-Sud
2012-2014
Centre National de la Recherche Scientifique
2012-2014
The 2 μm wavelength band has become a promising candidate to be the next communication window.We demonstrate high-speed modulators based on 220 nm silicon-on-insulator platform working at of 1950 nm, using free carrier plasma dispersion effect in silicon.A Mach-Zehnder interferometer modulator and microring have been characterized.At carrier-depletion operates data rate 20 Gbit/s with an extinction ratio 5.8 dB insertion loss 13 dB.The modulation efficiency (V π • L ) is 2.68 V•cm 4 V...
In this letter, we demonstrate high-performance waveguides and MMIs on an SOI platform at the fixed wavelength of 2 μm. The propagation loss demonstrated by insertion are as low 1 dB/cm 0.29 dB, respectively, with TE polarization. To best our knowledge, is lowest for Si rib reported a
We designed and demonstrated TE-mode arbitrary power splitters based on adiabatic mode evolution. The are with a footprint of smaller than 12 × 2.9 μm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , fabricated 400-nm silicon-on-insulator platform, requiring only single etch step. optimization process the conditions for arbitrary-power splitting performed using three-dimensional-FDTD simulations. prove this concept through fabrication...
A compact and ultrabroadband polarization beam splitter (PBS) utilizing a hybrid plasmonic Y-branch (HPYB) on silicon-on-insulator (SOI) platform is proposed numerically demonstrated. The HPYB consists of vertical waveguide (HPW) horizontal HPW formed by silicon (Si) silver (Ag) strip waveguides sandwiched with dioxide (SiO2) layer, in which the modes (HPMs) are excited input transverse electric (TE) magnetic (TM) modes, respectively. HPMs split into different ports coupled back to TE TM...
A conversion between the electromagnetically induced transparency (EIT) transmission and Fano is theoretically experimentally demonstrated in an all-pass microring-Bragg grating (APMR-BG) coupled-resonator system. In this work, coupling two resonators (the microring resonator Fabry-Perot formed by Bragg gratings) gives rise to EIT transmissions. The resonant status strongly depends on round-trip attenuation of strength. By tuning strength, transmissions can be controlled converted. device...
Thermally tunable Fano and electromagnetically induced transparency (EIT) resonances are theoretically experimentally demonstrated based on a Mach-Zehnder interferometer assisted Bragg grating-microring coupled resonant system silicon-on-insulator (SOI) platform. In this paper, the destructive constructive coupling between two resonators, microring resonator Fabry-Perot formed by gratings, give rise to EIT resonances, respectively. The resonance lineshape can be controlled converted tuning...
Room-temperature quantum-confined Stark effect in a Ge/SiGe quantum-well structure is reported at the wavelength of 1.3 μm. The operating tuned by use strain engineering. Low-energy plasma-enhanced chemical vapor deposition used to grow 20 periods strain-compensated quantum wells (8 nm Ge well and 12 Si0.35Ge0.65 barrier) on Si0.21Ge0.79 virtual substrate. fraction light absorbed per allows for strong modulation around half-width half-maximum excitonic peak only meV discussion physical...
An all-pass microring-Bragg gratings (APMR-BG) based coupling resonant system is proposed and experimentally demonstrated to generate electromagnetically induced transparency (EIT)-like transmission for the first time. The between two light path ways in micro-ring resonator Fabry-Pérot (F-P) formed by sections of Bragg gives rise EIT-like spectrum. This has advantage a small footprint consisting only one microring bus waveguide with gratings. It also large fabrication tolerance as overlap...
A mid-infrared (MIR) biochemical sensor based on a one-time Si etching suspended microracetrack resonator with lateral subwavelength-grating metamaterial cladding is theoretically and experimentally demonstrated commercial 340-nm-thick-top-silicon silicon-on-insulator platform. The structure offers an increased interaction area between the mode field chemicals under investigation, as well good sensitivity. process also eases fabrication. waveguide optimized to obtain balance propagation loss...
A fabrication-tolerant mid-infrared silicon polarization splitter and rotator (PSR) based on a partially etched grating-assisted coupler is proposed.The design of the structure allows to use different cladding layers, such as SiO2, make device compatible with metal back-end line process.Moreover, by using coupler, no longer limited precise requirement coupling length strength those in its counterparts directional couplers.The simulation results show that PSR can work over wide spectral range...
A strong quantum-confined Stark effect (QCSE) from light hole related transitions at the Γ point (LH1-cΓ1) in Ge/Si0.15Ge0.85 multiple quantum wells is demonstrated both photocurrent and optical transmission measurements. Our experimental results show a large sharp absorption peak due to LH1-cΓ1 transitions, its associated change based on QCSE. By exploiting modulators with improved compactness competitive extinction ratio loss can be envisioned for low energy chip-scale interconnect applications.
Compact all-pass and add-drop microring resonators (radius=10 μm) integrated with grating couplers working at 2 μm wavelength are designed, fabricated, characterized on a commercial 340-nm-thick-top-silicon silicon-on-insulator platform. They suitable for high-volume optical circuits as the fabrication process involved uncomplicated complementary metal-oxide-semiconductor (CMOS)-process compatible, thus making them more convenient to be utilized. The performance of couplers, based four most...
In this paper, a MIR silicon modulator operating at 2 µm wavelength is experimentally demonstrated. The shows 9.7 GHz 3-dB electro-optic bandwidth Vbias= −3V. We also present optical modulation 12.5 Gb/s.
A dual-band optical filter based on a single microring resonator embedded with nanoholes is theoretically and experimentally demonstrated for the first time. numerical model transfer matrix method utilized to simulate performance of this device. The coupling between Fabry-Pérot formed by gives rise filtering spectrum. In our experiment, was fabricated commercial 220-nm-thick-top-silicon silicon-on-insulator (SOI) platform. Good achieved measured extinction ratio 9 dB, insertion loss lower...
A microring-Bragg grating based coupling resonant system is experimentally demonstrated to generate switchable EIT-like and Fano transmissions for the first time. The resonance state dependent on relation between coefficient round-trip-intensity-attenuation.
An optical mode converter is proposed and designed. It consist of Y-branch splitters, combiners, phase shifter array. The input fundamental can be converted to TE1, TE2, TE3 by controlling the shifters. Furthermore, support high order modes conversion expansion structure. designed for wavelength mid infra-red (MIR). This device shows potential applications division multiplexing (MDM) system at MIR. . In recent years, on-chip has attracted much more attention since its pave a way increase...
Silicon-On-Insulator and Germanium-On-Insulator are both promising waveguide platforms for the mid-infrared wavelength of 2 μm. Here, we report design passive active devices including multimode interference couplers (MMI) MZI modulators built on platforms.
A 23 GHz Ge/SiGe multiple quantum well electro-absorption waveguide modulator is demonstrated with 10 dB extinction ratio (ER). 9 ER achieved 1V swing energy consumption limited to 108 fJ per bit.
In the last decades, dual-band optical filters (DBOFs) have attracted great attentions as they play important roles in various applications, such modulation [1], sensing [2], fast/slow light [3], etc. Multiple microring resonators been utilizing methods to realize filtering spectrum [4-6]. However, multiple-microring-resonators structure is not suitable for high volume integration due its large form factor. this work, we firstly developed a novel design based on...
A one-time etching suspended microracetrack resonator with lateral sub-wavelength-grating (SWG) metamaterial cladding is theoretically and experimentally demonstrated on commercial 340 nm-thick-top-silicon silicon-on-insulator (SOI) platform for mid-infrared (MIR) bio-chemical sensing applications. The structure can offer a larger exposed area of waveguides the testing chemicals as well decent sensitivity. And process also eases fabrication. waveguide optimized balance between propagation...
We demonstrate silicon-on-insulator based high speed modulators working at a wavelength of 1950 nm. The carrier-depletion Mach-Zehnder interferometer modulator operates data rate 20 Gbit/s with an extinction ratio 5.8 dB and modulation efficiency (V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">π</sub> L ) 2.68 Vcm 4 V reverse bias.
We show that Ge-rich Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1-x</sub> Ge xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> virtual substrates can act as passive, high-quality optical waveguides on which low-temperature, epitaxial growth of quantum well devices be realized. A proof-of-concept, low-voltage, broadband interconnect is presented.
We investigated Ge/SiGe QW modulators integrated on SOI waveguide. Promising performances are predicted and advances towards the fabrication of reported.