Min Tang

Leibniz Institute for Solid State and Materials Research

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Yong‐Zhen Huang

Chinese Academy of Sciences

Yue‐De Yang

Guiyang University

A. Q. Liu

Sichuan Agricultural University

Jin‐Long Xiao

Chinese Academy of Sciences

Hong Cai

Agency for Science, Technology and Research

Hai‐Zhong Weng

Advanced Materials and BioEngineering Research

Christian N. Saggau

Leibniz Institute for Solid State and Materials Research

Dim‐Lee Kwong

Agency for Science, Technology and Research

Oliver G. Schmidt

Chemnitz University of Technology

Piotr Kropelnicki

Excelitas Technologies (Singapore)

Cooperative Institutions

Chinese Academy of Sciences

Agency for Science, Technology and Research

University of Chinese Academy of Sciences

Institute of Microelectronics

Leibniz Institute for Solid State and Materials Research

Institute of Semiconductors

Singapore Science Park

National University of Singapore

Nanyang Technological University

State Key Laboratory on Integrated Optoelectronics

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Deterministic Yet Flexible Directional Light Emission from Spiral Nanomembrane Cavities

ACS Photonics (2019)

Jiawei Wang Yin Yin Yue‐De Yang Qi Hao Min Tang

Controlling the flow of light emitted from structures in micro/nanoscale is crucial for on-chip active photonic devices and their tremendous applications. Although previous reports focus on improving the directionality along a fixed angle, the realization of flexible directional emission becomes highly desired for simultaneously manipulating multiple light flows with different properties (e.g., wavelength, polarization, and wavevector), which paves the way to emerging two and one-half dimensional and three-dimensional (3D) integrated photonics technologies. Here, we propose self-rolled-up nanomembrane-based asymmetric cavities with a deliberately controlled spiral shape and demonstrate 3D directional light emissions. The interaction between 3D confined optical resonances and a spiral nanomembrane edge results in deterministic yet tunable emission directions. Polarization-selective directionality as well as the transition between bi- and unidirectional emission regimes is revealed by adjusting the cavity confinement and mode chirality. The spiral nanomembrane cavities featuring adjustable structural asymmetry provide new insights into chiral light-matter interaction and manipulating light emission for multiplexed classical and quantum light sources.

Light emission

Directionality

Structured Light

10.1021/acsphotonics.9b00992

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Citations (17)

Anti-oil-fouling hydrophobic-superoleophobic composite membranes for robust membrane distillation performance

The Science of The Total Environment (2019)

Min Tang Deyin Hou Chunli Ding Kunpeng Wang Dewu Wang

Membrane Distillation

Polyacrylonitrile

Electrospinning

Membrane Fouling

10.1016/j.scitotenv.2019.133883

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Citations (54)

Capacitive humidity sensor with a coplanar electrode structure based on anodised porous alumina film

Micro & Nano Letters (2012)

Jiawei Li Ying Liu Min Tang Jinghong Li Xinhua Lin

A simple and new relative humidity (RH) capacitive sensor with a two-layer planar structure based on anodic aluminium oxide (AAO) film serving as a sensing layer has been fabricated. A pair of separated tantalum thin films under the AAO layer served as two coplanar electrodes. AAO film was fabricated by anodising deposited aluminium thin film in oxalic acid. The influence of the pore size and thickness of the AAO film, and the electrode spacing, on the performance of the sensor was investigated. The RH sensor with a thicker AAO film and narrower electrode spacing was more sensitive. By pore widening, the sensitivity of the sensor can be improved. The achieved average sensitivity as high as ∼3.57 pF/RH% was obtained for sensors with an AAO layer of 2 µm thickness and 80 nm pore size. These results were explained using the partial capacitance method and parallel-serial model. In addition, under the humidity range of 20–80%, sensors with 70 nm pores had the highest sensitivity, which was interpreted in terms of effective permittivity and anion concentration. This study provides an easy method to fabricate high-performance humidity sensors with very simple structures for practical applications.

Anodizing

10.1049/mnl.2012.0666

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Steering Directional Light Emission and Mode Chirality through Postshaping of Cavity Geometry

Laser & Photonics Review (2020)

Jiawei Wang Min Tang Yue‐De Yang Yin Yin Yan Chen

Abstract Dielectric optical microcavities have been explored as an excellent platform to manipulate the light flow and investigate non‐Hermitian physics in open optical systems. For whispering gallery mode optical microcavities, modifying the rotational symmetry is highly desirable for intriguing phenomena such as degenerated chiral modes and directional light emission. However, for the state‐of‐the‐art approaches, namely deforming the cavity geometry by precision lithography or introducing local scatterers near the cavity boundary via micromanipulation, there is a lack of flexibility in fine‐adjusting of chiral symmetry and far‐field emission direction. Here, precise engineering of cavity boundary using electron‐beam‐induced deposition is reported based on rolled‐up nanomembrane‐enabled spiral‐shaped microcavities. The deformation of outer boundary results in delicate tailoring of asymmetric backscattering between the outer and inner rolling edges, and hence deterministically strong mode chirality. Besides, the crescent‐shaped high‐index nanocap leads to modified light tunneling channels and inflected far‐field emission angle. It is envisioned that such a localized deposition‐assisted technique for adjusting the structural deformation of 3D optical microcavities will be highly useful for understanding rich insights in non‐Hermitian photonics and unfolding exotic properties on lasing, sensing, and cavity quantum electrodynamics.

Chirality

10.1002/lpor.202000118

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Citations (11)

Study of optical bistability based on hybrid-cavity semiconductor lasers

AIP Advances (2019)

Fuli Wang Yong‐Zhen Huang Yue‐De Yang Chunguang Ma You‐Zeng Hao

All-optical flip-flop has been demonstrated experimentally based on our optical bistable hybrid square-rectangular lasers. In this paper, dual-mode rate equations are utilized for studying the optical bistability in the two-section hybrid-coupled semiconductor laser. A phenomenological gain spectrum model is constructed for considering the mode competition in gain section and saturable absorption effect in the absorptive section in a wide wavelength range. The mechanisms of the optical bistability are verified in the aspect of the distribution of carriers and photons in the two-section hybrid-coupled cavity. In addition, we find that with the adjustment of the device parameters, both of the width and biasing current for achieving the bistability can be tuned for a wide range. Furthermore, a dynamic response of all-optical flip-flop is simulated, using a pair of set/reset optical triggering pulses, in order to figure out the laws for faster transition time with lower power consumption.

Optical Bistability

Bistability

Biasing

Saturable absorption

Optical power

10.1063/1.5081003

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Citations (9)

Nano-opto-mechanical (NOM) acoustic wavefront sensor via ring resonators

Bin Dong Hong Cai J. M. Tsai Piotr Kropelnicki A. B. Randles

Nano-opto-mechanical systems (NOMS) based sensor is attracting widely attention due to its low cost, small footprint and good capability. Optical enabled NOMS acoustic wavefront sensor offers superior resolution and resilience to electromagnetic interference. In this paper, a novel NOMS acoustic wavefront sensor based on ring resonator array is proposed. The resonance wavelength of the ring resonator is modified by the membrane which is beneath the ring resonator can be deformed by the acoustic pressure. It has merits including high sensitivity, good linearity, CMOS compatibility and ease in integration.

Wavefront sensor

Linearity

10.1109/transducers.2013.6627273

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Widely tunable single-mode lasers based on a hybrid square/rhombus-rectangular microcavity

Photonics Research (2019)

You‐Zeng Hao Fuli Wang Min Tang Hai‐Zhong Weng Yue‐De Yang

Hybrid square/rhombus-rectangular lasers (HSRRLs) consisting of a Fabry–Perot (FP) cavity and a square/rhombus microcavity (SRM) are proposed and demonstrated for realizing single-mode lasing with a wide wavelength tuning range. The SRM is a deformed square microcavity with a vertex extended to the FP cavity to control the coupled mode field pattern in the FP cavity. Single-mode operation with a side-mode suppression ratio (SMSR) over 45.3 dB is realized, and a wide wavelength tuning range of 21 nm with SMSR >35 dB is further demonstrated by adjusting the injection currents of the SRM and the FP cavity simultaneously. Furthermore, a 3-dB modulation bandwidth of 14.1 GHz and an open-eye diagram at 35 Gb/s are demonstrated for the HSRRL.

Rhombus

Square (algebra)

10.1364/prj.7.000543

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Citations (26)

Interfacial Chemistry Triggers Ultrafast Radiative Recombination in Metal Halide Perovskites

Angewandte Chemie International Edition (2022)

Haiyun Dong Chunhuan Zhang Weijie Nie Shengkai Duan Christian N. Saggau

Efficient radiative recombination is essential for perovskite luminescence, but the intrinsic radiative recombination rate as a basic material property is challenging to tailor. Here we report an interfacial chemistry strategy to dramatically increase the radiative recombination rate of perovskites. By coating aluminum oxide on the lead halide perovskite, lead-oxygen bonds are formed at the perovskite-oxide interface, producing the perovskite surface states with a large exciton binding energy and a high localized density of electronic state. The oxide-bonded perovskite exhibits a ≈500 fold enhanced photoluminescence with a ≈10 fold reduced lifetime, indicating an unprecedented ≈5000 fold increase in the radiative recombination rate. The enormously enhanced radiative recombination promises to significantly promote the perovskite optoelectronic performance.

10.1002/anie.202115875

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Citations (28)

A novel transducer for photon energy detection via near-field cavity optomechanics

Jin Tao Hong Cai Q. X. Zhang J. M. Tsai Piotr Kropelnicki

This paper reports an optomechanical transducer for photon energy detection on the silicon-photonics platform. The photon energy is enhanced by a ring resonator and converted into mechanical energy via optical gradient force. An integrated electron tunneling displacement sensor is used to detect the photon-induced mechanical deformation on-chip. Compared with the traditional photon energy detection based on photon absorption, this optomechanical transducer has more compact size (60 μm × 230 μm), low thermal noise (0.03 V/ °C) and low cost. And it is a silicon based device, compatible with CMOS process and easier to be integrated with silicon-photonics.

Optomechanics

10.1109/transducers.2013.6627068

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Citations (1)

Theoretical study of the output energy for various MEMS based electrostatic mechanisms

IEEE International Conference on Sustainable Energy Technologies (2008)

Ye Mei Lim Bin Yang Rama Krishna Kotlanka Chun-Huat Heng Jin Xie

This paper presents a comparison of the energy harvesting capabilities of 3 different electrostatic mechanisms based on MEMS (microelectromechanical system) structures which are designed and operated in idea vacuum. The 3 mechanisms that will be compared are the in-plane overlap, in-plane gap closing and out-of-plane gap closing mechanisms. Firstly, it was found that the in-plane gap closing mechanism potentially has the highest output energy amongst the 3 different mechanisms. Secondly, the best energy output for the in-plane gap closing mechanism is approximately 1.8 times that of the out-of-plane gap closing mechanism for load volumes between 5 mm ³ and 50 mm ³ .

10.1109/icset.2008.4747069

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Citations (5)