scholarly journals Demonstration of on-chip gigahertz acousto-optic modulation at near-visible wavelengths

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yue Yu ◽  
Lai Wang ◽  
Xiankai Sun
Keyword(s):  
Lithium Niobate ◽  
Bound States ◽  
Quantum Information Processing ◽  
Modulation Frequency ◽  
Device Fabrication ◽  
Photonic Integration ◽  
Integration Density ◽  
Visible Wavelengths ◽  
On Chip ◽  
Significant Attention

Abstract Lithium niobate integrated photonics has recently received significant attention because it exploits the attractive properties of lithium niobate on an integrated platform which provides strong optical confinement as well as high photonic integration density. Although many optical functionalities of lithium niobate have been demonstrated on a chip in the telecom band, the visible and near-visible regimes are less explored. This is mainly because devices with a relatively smaller feature size are required which increases fabrication difficulty. Here, we explored the acousto-optic effect of lithium niobate on a chip at near-visible wavelengths (765–781 nm) and demonstrated acousto-optic modulation with the modulation frequency up to 2.44 GHz. We adopted an etchless process for the device fabrication and applied the principle of bound states in the continuum to optimize the device performance. By demonstrating functionality at near-visible wavelengths, our devices will enable many on-chip applications ranging from frequency metrology to quantum information processing.

scholarly journals Acousto-optic modulation of photonic bound state in the continuum

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Zejie Yu ◽  
Xiankai Sun
Keyword(s):  
Refractive Index ◽  
Integrated Circuits ◽  
Acoustic Waves ◽  
Bound States ◽  
Quantum Information Processing ◽  
Modulation Frequency ◽  
Surface Acoustic Waves ◽  
High Refractive Index ◽  
Bound State ◽  
The Continuum

AbstractPhotonic bound states in the continuum (BICs) have recently been studied in various systems and have found wide applications in sensors, lasers, and filters. Applying BICs in photonic integrated circuits enables low-loss light guidance and routing in low-refractive-index waveguides on high-refractive-index substrates, which opens a new avenue for integrated photonics with functional single-crystal materials. Here, we demonstrate high-quality integrated lithium niobate microcavities inside which the photonic BIC modes circulate and further modulate these BIC modes acousto-optically by using piezoelectrically actuated surface acoustic waves at microwave frequencies. With a high acousto-optic modulation frequency, the acousto-optic coupling is well situated in the resolved-sideband regime. This leads to coherent coupling between microwave and optical photons, which is exhibited by the observed electro-acousto-optically induced transparency and absorption. Therefore, our devices serve as a paradigm for manipulating and controlling photonic BICs on a chip, which will enable many other applications of photonic BICs in the areas of microwave photonics and quantum information processing.

scholarly journals Development of a Mobile Analytical Chemistry Workstation Using a Silicon Electrochromatography Microchip and Capacitively Coupled Contactless Conductivity Detector

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 239
Author(s):  
Yineng Wang ◽  
Xi Cao ◽  
Walter Messina ◽  
Anna Hogan ◽  
Justina Ugwah ◽  
...  
Keyword(s):  
Capillary Electrochromatography ◽  
High Efficiency ◽  
Device Fabrication ◽  
Capacitively Coupled ◽  
Packaging Design ◽  
Design And Optimization ◽  
Nanofabrication Technique ◽  
On Chip ◽  
Silicon Based ◽  
Rapid Separations

Capillary electrochromatography (CEC) is a separation technique that hybridizes liquid chromatography (LC) and capillary electrophoresis (CE). The selectivity offered by LC stationary phase results in rapid separations, high efficiency, high selectivity, minimal analyte and buffer consumption. Chip-based CE and CEC separation techniques are also gaining interest, as the microchip can provide precise on-chip control over the experiment. Capacitively coupled contactless conductivity detection (C4D) offers the contactless electrode configuration, and thus is not in contact with the solutions under investigation. This prevents contamination, so it can be easy to use as well as maintain. This study investigated a chip-based CE/CEC with C4D technique, including silicon-based microfluidic device fabrication processes with packaging, design and optimization. It also examined the compatibility of the silicon-based CEC microchip interfaced with C4D. In this paper, the authors demonstrated a nanofabrication technique for a novel microchip electrochromatography (MEC) device, whose capability is to be used as a mobile analytical equipment. This research investigated using samples of potassium ions, sodium ions and aspirin (acetylsalicylic acid).

On-chip erbium-doped lithium niobate microcavity laser and spiral waveguide amplifier

2021 ◽  
Author(s):  
Xiongshuo Yan ◽  
Yi'an Liu ◽  
Jiangwei Wu ◽  
Xiangmin Liu ◽  
Yuping Chen ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Microcavity Laser ◽  
Erbium Doped ◽  
On Chip ◽  
Spiral Waveguide

scholarly journals Strong nonlinear optics in on-chip coupled lithium niobate microdisk photonic molecules

2020 ◽  
Vol 22 (7) ◽  
pp. 073030 ◽  
Author(s):  
Min Wang ◽  
Ni Yao ◽  
Rongbo Wu ◽  
Zhiwei Fang ◽  
Shilong Lv ◽  
...  
Keyword(s):  
Nonlinear Optics ◽  
Lithium Niobate ◽  
Photonic Molecules ◽  
On Chip

scholarly journals Photonic welding points for arbitrary on-chip optical interconnects

Nanophotonics ◽  
2018 ◽  
Vol 7 (10) ◽  
pp. 1679-1686 ◽  
Author(s):  
Zejie Yu ◽  
Yang Ma ◽  
Xiankai Sun
Keyword(s):  
Integrated Circuits ◽  
Low Loss ◽  
Photonic Networks ◽  
New Approach ◽  
Waveguide Bends ◽  
Arbitrary Configuration ◽  
Integration Density ◽  
On Chip ◽  
Insertion Losses ◽  
Further Development

AbstractPhotonic integrated circuits (PICs) are an ideal platform for chip-scale computation and communication. To date, the integration density remains an outstanding problem that limits the further development of PIC-based photonic networks. Achieving low-loss waveguide routing with arbitrary configuration is crucial for both classical and quantum photonic applications. To manipulate light flows on a chip, the conventional wisdom relies on waveguide bends of large bending radii and adiabatic mode converters to avoid insertion losses from radiation leakage and modal mismatch, respectively. However, those structures usually occupy large footprints and thus reduce the integration density. To overcome this difficulty, this work presents a fundamentally new approach to turn light flows arbitrarily within an ultracompact footprint. A type of “photonic welding points” joining two waveguides of an arbitrary intersecting angle has been proposed and experimentally demonstrated. These devices with a footprint of less than 4 μm2can operate in the telecommunication band over a bandwidth of at least 140 nm with an insertion loss of less than 0.5 dB. Their fabrication is compatible with photonic foundry processes and does not introduce additional steps beyond those needed for the waveguides. Therefore, they are suitable for the mass production of PICs and will enhance the integration density to the next level.

scholarly journals Ultrafast control of fractional orbital angular momentum of microlaser emissions

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Zhifeng Zhang ◽  
Haoqi Zhao ◽  
Danilo Gomes Pires ◽  
Xingdu Qiao ◽  
Zihe Gao ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Optical Communication ◽  
High Speed ◽  
Quantum Information Processing ◽  
Time Window ◽  
Gain Medium ◽  
Control Pulse ◽  
Processing Technologies ◽  
On Chip

Abstract On-chip integrated laser sources of structured light carrying fractional orbital angular momentum (FOAM) are highly desirable for the forefront development of optical communication and quantum information–processing technologies. While integrated vortex beam generators have been previously demonstrated in different optical settings, ultrafast control and sweep of FOAM light with low-power control, suitable for high-speed optical communication and computing, remains challenging. Here we demonstrate fast control of the FOAM from a vortex semiconductor microlaser based on fast transient mixing of integer laser vorticities induced by a control pulse. A continuous FOAM sweep between charge 0 and charge +2 is demonstrated in a 100 ps time window, with the ultimate speed limit being established by the carrier recombination time in the gain medium. Our results provide a new route to generating vortex microlasers carrying FOAM that are switchable at GHz frequencies by an ultrafast control pulse.

Ultrafast control of vortex microlasers

Science ◽  
2020 ◽  
Vol 367 (6481) ◽  
pp. 1018-1021 ◽  
Author(s):  
Can Huang ◽  
Chen Zhang ◽  
Shumin Xiao ◽  
Yuhan Wang ◽  
Yubin Fan ◽  
...  
Keyword(s):  
Energy Consumption ◽  
High Speed ◽  
Optical Switching ◽  
Quantum Information Processing ◽  
All Optical ◽  
Low Energy Consumption ◽  
Linearly Polarized ◽  
Terahertz Frequencies ◽  
On Chip ◽  
All Optical Switching

The development of classical and quantum information–processing technology calls for on-chip integrated sources of structured light. Although integrated vortex microlasers have been previously demonstrated, they remain static and possess relatively high lasing thresholds, making them unsuitable for high-speed optical communication and computing. We introduce perovskite-based vortex microlasers and demonstrate their application to ultrafast all-optical switching at room temperature. By exploiting both mode symmetry and far-field properties, we reveal that the vortex beam lasing can be switched to linearly polarized beam lasing, or vice versa, with switching times of 1 to 1.5 picoseconds and energy consumption that is orders of magnitude lower than in previously demonstrated all-optical switching. Our results provide an approach that breaks the long-standing trade-off between low energy consumption and high-speed nanophotonics, introducing vortex microlasers that are switchable at terahertz frequencies.

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