Guangyuan Si

Northeastern University

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Jiangtao Lv

Northeastern University

Xiaoxiao Jiang

University of Chinese Academy of Sciences

Yu Ying

Shenyang Jianzhu University

Qiongchan Gu

Universidad del Noreste

Jiao Lin

Xi'an Jiaotong University

Qingdong Ou

Macau University of Science and Technology

Jinghua Teng

Agency for Science, Technology and Research

Yan Liu

Guilin University of Electronic Technology

Xiaocong Yuan

Shenzhen University

Aaron J. Danner

National University of Singapore

Cooperative Institutions

Chinese Academy of Sciences

Northeastern University

Monash University

Shenzhen University

National University of Singapore

University of Science and Technology of China

Australian Regenerative Medicine Institute

Agency for Science, Technology and Research

University of Chinese Academy of Sciences

Universidad del Noreste

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Deep anisotropic LiNbO3 etching with SF6/Ar inductively coupled plasmas

Journal of Vacuum Science & Technology B Nanotechnology and Microelectronics Materials Processing Measurement and Phenomena (2012)

Jun Deng Jia Wei Ching Eng Png Guangyuan Si Jaesung Son

A SF6/Ar inductively coupled plasma (ICP) technique was investigated to improve etching of proton exchanged LiNbO3. The influences of He backside cooling, power, and gas flows on characteristics such as etching rate, sidewall slope angle, and surface roughness were investigated. Total gas flow is a key parameter that affects etching results, and an optimized gas flow (50 sccm) was used for lengthy etching processes (30 min). Deep (>3 μm) and highly anisotropic etching, as well as ultra smooth LiNbO3 surfaces were achieved in a single-step run. The authors’ proposed method has achieved the deepest, most vertical, minimal residue structure yet reported for single-step ICP etching.

Dry etching

Plasma Etching

10.1116/1.3674282

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Citations (29)

Unidirectionally excited phonon polaritons in high-symmetry orthorhombic crystals

Science Advances (2022)

Qing Zhang Qingdong Ou Guangyuan Si Guangwei Hu Shaohua Dong

Advanced control over the excitation of ultraconfined polaritons-hybrid light and matter waves-empowers unique opportunities for many nanophotonic functionalities, e.g., on-chip circuits, quantum information processing, and controlling thermal radiation. Recent work has shown that highly asymmetric polaritons are directly governed by asymmetries in crystal structures. Here, we experimentally demonstrate extremely asymmetric and unidirectional phonon polariton (PhP) excitation via directly patterning high-symmetry orthorhombic van der Waals (vdW) crystal α-MoO3. This phenomenon results from symmetry breaking of momentum matching in polaritonic diffraction in vdW materials. We show that the propagation of PhPs can be versatile and robustly tailored via structural engineering, while PhPs in low-symmetry (e.g., monoclinic and triclinic) crystals are largely restricted by their naturally occurring permittivities. Our work synergizes grating diffraction phenomena with the extreme anisotropy of high-symmetry vdW materials, enabling unexpected control of infrared polaritons along different pathways and opening opportunities for applications ranging from on-chip photonics to directional heat dissipation.

Orthorhombic crystal system

Triclinic crystal system

Nanophotonics

10.1126/sciadv.abn9774

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Citations (34)

A High Refractive Index Plasmonic Micro-Channel Sensor Based on Photonic Crystal Fiber

Nanomaterials (2022)

Jiangtao Lv Tong Xiang Liang Qiongchan Gu Qiang Liu Yu Ying

A new concave shaped high refractive index plasmonic sensor with a micro-channel is proposed in this work, which comprises an analyte channel in the core hole. The sensor is elaborately designed to reduce the interference effect from the metal coating. Furthermore, the impact of the proposed structure on the sensitivity is also investigated by engineering the geometric parameters using the finite element method. We select gold as the plasmonic material in this theoretical study because it is widely used to fabricate plasmonic and metamaterial devices due to its chemical stability and compatibility. According to wavelength interrogation technique, simulations results show that this sensor can obtain maximal wavelength sensitivity of 10,050 nm/refractive index unit. In view of the excellent indicators of this device, it has important development potential in chemical and biological research fields.

10.3390/nano12213764

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Citations (6)

Artificial Structural Color Pixels: A Review

Materials (2017)

Yuqian Zhao Yong Zhao Sheng Hu Jiangtao Lv Yu Ying

Inspired by natural photonic structures (Morpho butterfly, for instance), researchers have demonstrated varying artificial color display devices using different designs. Photonic-crystal/plasmonic color filters have drawn increasing attention most recently. In this review article, we show the developing trend of artificial structural color pixels from photonic crystals to plasmonic nanostructures. Such devices normally utilize the distinctive optical features of photonic/plasmon resonance, resulting in high compatibility with current display and imaging technologies. Moreover, dynamical color filtering devices are highly desirable because tunable optical components are critical for developing new optical platforms which can be integrated or combined with other existing imaging and display techniques. Thus, extensive promising potential applications have been triggered and enabled including more abundant functionalities in integrated optics and nanophotonics.

Nanophotonics

Structural Coloration

Color filter array

10.3390/ma10080944

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Citations (74)

Planar peristrophic multiplexing metasurfaces

Opto-Electronic Advances (2022)

Jia Chen Dapeng Wang Guangyuan Si Siew Lang Teo Qian Wang

As a promising counterpart of two-dimensional metamaterials, metasurfaces enable to arbitrarily control the wavefront of light at subwavelength scale and hold promise for planar holography and applicable multiplexing devices. Nevertheless, the degrees of freedom (DoF) to orthogonally multiplex data have been almost exhausted. Compared with state-of-the-art methods that extensively employ the orthogonal basis such as wavelength, polarization or orbital angular momentum, we propose an unprecedented method of peristrophic multiplexing by combining the spatial frequency orthogonality with the subwavelength detour phase principle. The orthogonal relationship between the spatial frequency of incident light and the locally shifted building blocks of metasurfaces can be regarded as an additional DoF. We experimentally demonstrate the viability of the multiplexed holograms. Moreover, this newly-explored orthogonality is compatible with conventional DoFs. Our findings will contribute to the development of multiplexing metasurfaces and provide a novel solution to nanophotonics, such as large-capacity chip-scale devices and highly integrated communication.

Spatial multiplexing

Orthogonality

Spatial light modulator

10.29026/oea.2023.220141

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Citations (59)

Hyperbolic polaritonic crystals with configurable low-symmetry Bloch modes

Nature Communications (2023)

Jiangtao Lv Yingjie Wu Jingying Liu Youning Gong Guangyuan Si

Photonic crystals (PhCs) are a kind of artificial structures that can mold the flow of light at will. Polaritonic crystals (PoCs) made from polaritonic media offer a promising route to controlling nano-light at the subwavelength scale. Conventional bulk PhCs and recent van der Waals PoCs mainly show highly symmetric excitation of Bloch modes that closely rely on lattice orders. Here, we experimentally demonstrate a type of hyperbolic PoCs with configurable and low-symmetry deep-subwavelength Bloch modes that are robust against lattice rearrangement in certain directions. This is achieved by periodically perforating a natural crystal α-MoO3 that hosts in-plane hyperbolic phonon polaritons. The mode excitation and symmetry are controlled by the momentum matching between reciprocal lattice vectors and hyperbolic dispersions. We show that the Bloch modes and Bragg resonances of hyperbolic PoCs can be tuned through lattice scales and orientations while exhibiting robust properties immune to lattice rearrangement in the hyperbolic forbidden directions. Our findings provide insights into the physics of hyperbolic PoCs and expand the categories of PhCs, with potential applications in waveguiding, energy transfer, biosensing and quantum nano-optics.

Bloch wave

Lattice (music)

10.1038/s41467-023-39543-w

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Citations (25)

Fabrication and characterization of well-aligned plasmonic nanopillars with ultrasmall separations

Nanoscale Research Letters (2014)

Guangyuan Si Xiaoxiao Jiang Jiangtao Lv Qiongchan Gu Fengwen Wang

We show the fabrication of well-aligned gold and silver nanopillars with various array parameters via interference lithography followed by ion beam milling and compare the etching rates of these two metallic materials. Silver is suitable for fabricating ultrafine arrays with ultrasmall separations due to high milling rates. The optical properties of the fabricated nanopillars are specifically characterized from both normal incidence and oblique incident angles. Tunable surface plasmon resonances are achieved with varying structural parameters. Strong coupling effects are enabled when the separation between adjacent nanopillars is dramatically reduced, leading to useful applications in sensing and waveguiding.

Nanopillar

Interference lithography

Nanochemistry

Nanosphere lithography

Characterization

10.1186/1556-276x-9-299

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Citations (23)

Incident-angle dependent color tuning from a single plasmonic chip

Nanotechnology (2014)

Guangyuan Si Yanhui Zhao Eunice S. P. Leong Jiangtao Lv Yan Liu

We report on a broad color tuning effect covering the visible range from a single plasmonic chip. By simply tilting the orientation of the designed plasmonic chip within a certain range, the photon–plasmon coupling interactions between the incident light and the plasmonic nanostructures on the chip can be finely tuned, resulting in an angle-dependent continuous color filtering effect. The physical mechanism of the device is investigated through the full-wave calculations, which provide important guidance for the design and optimization of the proposed devices. The broad color tuning from the demonstrated single chip will potentially benefit visualization and display technologies, and is particularly useful for the construction of reflection-based spatial light modulators.

Ray

Color filter array

10.1088/0957-4484/25/45/455203

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Citations (26)

Tuning plasmon resonance in depth-variant plasmonic nanostructures

Materials & Design (2016)

Xiaoxiao Jiang Eunice S. P. Leong Yan Liu Guangyuan Si

Nanophotonics

Aperture (computer memory)

Coaxial

Localized surface plasmon

10.1016/j.matdes.2016.02.005

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Citations (20)

Plasmon enhanced perovskite-metallic photodetectors

Materials & Design (2020)

Qiongchan Gu Chunhai Hu Jiming Yang Jiangtao Lv Yu Ying

Perovskite based photodetectors and hybrid devices possess distinctive properties which have enabled considerable practical applications since perovskite is an ideal candidate for higher sensitivity and response speed. In this work, an elegant approach of fabricating hybrid photodetectors based on perovskite-metallic nanostructures is shown. By combining gold triangle nanoantennae with a CH3NH2PbI3 film, a simple yet effective fabrication method of hybrid organic-inorganic perovskite photodetectors with improved performanceis experimentally demonstrated. Finite difference time domain calculations agree well with experimental results. Perovskite-assisted devices are highly attractive due to their unique properties and the results shown in this work may find extensive potential applications for novel flexible photodetectors and other related optical devices.

10.1016/j.matdes.2020.109374

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Citations (20)