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High-Q lithium niobate microring resonators using lift-off metallic masks [Invited]

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Chinese Optics Letters 2021年第6期19卷 44-49页

作者： Ke Zhang Zhaoxi Chen Hanke Feng Wing-Han Wong edwin yue-bun pun Cheng Wang Department of Electrical Engineering City University of Hong KongKowloonHong KongChina State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong KongChina

High-Q lithium niobate(LN) optical micro-resonators are an excellent platform for future applications in optical communications, nonlinear optics, and quantum optics. To date, high-Q factors are typically achieved in LN using either dielectric masks or femtosecond laser ablation, while the more standard and commonly available lift-off metallic masks are often believed to lead to rough sidewalls and lowered Q factors. Here, we show that LN microring resonators with strong light confinement and intrinsic Q factors over 1 million can be fabricated using optimized lift-off metallic masks and dry etching processes, corresponding to a waveguide propagation loss of ~0.3 d B=cm. The entire process is fully compatible with wafer-scale production and could be transferred to other photonic materials.

关键词： lithium niobate optical resonators microstructure fabrication

Broadband adiabatic polarization rotator-splitter based on a lithium niobate on insulator platform

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Photonics Research 2021年第12期9卷 2319-2324页

作者： ZHAOXI CHEN JINGWEI YANG ING-HAN WONG edwin yue-bun pun CHENG WANG Department of Electrical Engineering City University of Hong KongKowloonHong KongChina State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong KongChina

Polarization rotator-splitters(PRSs)are crucial components for controlling the polarization states of light in classical and quantum communication *** design and experimentally demonstrate a broadband PRS based on the lithium niobate on insulator(LNOI)*** the rotator and splitter sections are based on adiabatically tapered waveguide structures,and the whole device only requires a single etching *** show efficient PRS operation over an experimentally measured bandwidth of 130 nm at telecom wavelengths,potentially as wide as 500 nm according to simulation prediction,with relatively low polarization crosstalks of~-10 d *** PRS is highly compatible with the design constraints and fabrication processes of common LNOI photonic devices,and it could become an important element in future LNOI photonic integrated circuits.

关键词： polarization waveguide lithium

Optical-damage-resistant Locally Er/Mg-doped Nearstoichiometric Ti:Mg:Er:LiNbO3 Strip Waveguides

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Optical-damage-resistant Locally Er/Mg-doped Nearstoichiomet...

Long Period Grating on Strip Ti:LiNbO3 Waveguide Embedded in Planar Ti:LiNbO3 Waveguide

中国光学学会2010年光学大会

作者： edwin yue-bun pun Department of Electronic Engineering City University of Hong Kong

We report photorefractive-damage-resistant nearstoichiometric Ti:Mg:Er:LiNbO 3 single-mode strip waveguides fabricated on a congruent LiNbO 3 in sequence by local Er-doping,Mg/Ti pre-diffusion and post *** optical properties,composition,crystalline phase and Mg,Er and Ti profiles of the waveguides were *** waveguides would open up a way towards new devices.

关键词： Ti:Mg:Er:LiNbO 3 waveguide Near-stoichiometry Anti-photorefraction Local Er/Mg-codoping

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Long Period Grating on Strip Ti:LiNbO3 Waveguide Embedded in...

Tm^(3+)Yb^(3+)共掺铋碲酸盐玻璃中的高效蓝色上转换荧光

中国光学学会2010年光学大会

作者： edwin yue-bun pun Department of Electronic Engineering City University of Hong Kong

A special structure of a strip Ti:LiNbO 3 （Ti:LN） waveguide embedded in a planar Ti:LN waveguide is proposed to fabricate a long period waveguide grating （LPWG）.Its applicability is demonstrated by fabricating a long period grating on the waveguide surface using the usual *** is shown that an LPWG device based on such a special waveguide structure is thermally stable.

关键词： Strip Ti:LiNbO 3 waveguide cladded with planar Ti:LiNbO 3 waveguide Long period grating Thermal stability

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物理学报 2006年第8期55卷 4304-4309页

作者：杨殿来侯嫣嫣赵昕刘贵山林海刘克 edwin yue-bun pun 大连轻工业学院化工与材料学院大连116034 香港城市大学电子工程系

制备了高折射率Tm3+Yb3+共掺杂铋碲酸盐玻璃,利用棱镜耦合法测量出玻璃在632.8和1550nm波长处的折射率分别为2.0365和1.9795.对玻璃的吸收、荧光和红外透过光谱展开了测试与分析,根据JuddOfelt理论对吸收光谱进行拟合,求得Tm3+的振子强... 详细信息

制备了高折射率Tm3+Yb3+共掺杂铋碲酸盐玻璃,利用棱镜耦合法测量出玻璃在632.8和1550nm波长处的折射率分别为2.0365和1.9795.对玻璃的吸收、荧光和红外透过光谱展开了测试与分析,根据JuddOfelt理论对吸收光谱进行拟合,求得Tm3+的振子强度参数Ωt(t=2,4,6)分别为3.90×10-20,2.03×10-20和9.03×10-21cm2,并进一步计算了Tm3+在玻璃中各能级跃迁的振子强度、自发辐射跃迁概率、辐射寿命和荧光分支比等光谱参数.在980nm激光激发下测得强的蓝色三光子上转换和近红外双光子上转换荧光.宽的红外透过窗口、高的折射率和强的蓝色上转换荧光表明,Tm3+Yb3+共掺铋碲酸盐玻璃有希望成为高效的上转换发光和激光材料.

关键词： Tm^3+/Yb^3+共掺铋碲酸盐玻璃光谱参数上转换荧光

Rare Earth Doped Glass Waveguide Amplifiers

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光学学报 2003年第S1期23卷 357-358页

作者： edwin Y.B. pun Department of Electronic Engineering City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong P.R.China

Progress in rare earth doped planar glass waveguide devices has been significant over the past few years. The history and applications of these devices are reviewed.

关键词： been Rare Earth Doped Glass Waveguide Amplifiers have for EDWA dBm were

Design and fabrication of 1-D semiconductor nanomaterials for high-performance photovoltaics

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Science Bulletin 2016年第5期61卷 357-367页

作者： Ning Han Zaixing Yang Lifan Shen Hao Lin Ying Wang edwin Y.B.pun Yunfa Chen Johnny C.Ho State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of SciencesBeijing 100190 China CAS Center for Excellence in Urban Atmospheric Environment Xiamen 361021 China Department of Physics and Materials Science City University of Hong Kong Hong Kong China State Key Laboratory of Millimeter Waves City University of Hong Kong Hong Kong China Shenzhen Research Institute City University of Hong KongShenzhen 518057 China Department of Electronic Engineering City University of Hong Kong Hong Kong China

To date, the cost-effective utilization of solar energy by photovoltaics for large-scale deployment remains challenging. Further cost minimization and efficiency maximization, through reduction of material consumption, simplification of device fabrication as well as optimization of device structure and geometry, are required. The usage of 1D nanomaterials is attractive due to the outstanding light coupling effect, the ease of fabrication, and integration with one-dimensional(1-D) semiconductor materials. The light absorption efficiency can be enhanced significantly, and the corresponding light-toelectricity conversion efficiency can be as high as their bulk counterparts. Also, the amount of active materials used can be reduced. This review summarizes the recent development of 1-D nanomaterials for photovoltaic applications, including the anti-reflection, the light absorption,the minority diffusion, and the semiconductor junction properties. With solid progress and prospect shown in the past 10 years, 1-D semiconductor nanomaterials are attractive and promising for the realization of high-efficiency and low-cost solar cells.

关键词： One-dimensional nanomaterials Photovoltaics Solar cells Light absorption Minority diffusion length Semiconductor junction

Broadband adiabatic polarization rotator-splitter based on a lithium niobate on insulator platform: publisher's note

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Photonics Research 2022年第2期10卷 364-364页

作者： Zhaoxi Chen Jingwei Yang Wing-Han Wong edwin yue-bun pun Cheng Wang Department of Electrical Engineering City University of Hong KongKowloonHong KongChina State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong KongChina

The second paragraph in Section 2 of this article was corrected as *** the polarization rotator (Step I), the LN rib waveguide adiabatically widens from a top width of 1.2 to 3.6μm via a linear taper, such that the e... 详细信息

关键词： polarization waveguide adiabatic

Rare Earth Doped Polymer Waveguide Materials and Devices

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复旦学报（自然科学版） 2007年第5期46卷 626-页

作者： edwin Y.B.pun Department of Electronic Engineering City University of Hong KongTat Chee Avenue KowloonHong Kong China

1 Results Rare earth doped waveguide amplifiers and devices have been demonstrated in silica, crystal and other glass hosts. These rare earth doped optical waveguide devices are based on inorganic materials. Many processing steps are required and can lead to long fabrication time and low *** materials offer many distinct properties compared to inorganic materials, such as ease of fabrication, low production costs, simple processing steps, and compatibility with micro-fabrication technologies. ...

关键词： rare earth doped waveguide amplifier Nedymium Erbium