Zhenzhou Cheng

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Verified

Zhenzhou verified their affiliation via an institutional email.

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• Ph.D.
• Professor & Chairman at Tianjin University

Short-wavelength mid-infrared (2–2.5 μm wave band) silicon photonics has been a growing area to boost the applications of integrated optoelectronics in free-space optical communications, laser ranging, and biochemical sensing. In this spectral region, multi-project wafer foundry services developed for the telecommunication band are easily adaptable...

Hyperuniform disordered solid (HUDS) structures can provide large, uniform, complete, and isotropic light confinement at the nanoscale after precise design. Based on the HUDS structures, in-plane light confinement for developing photonic integrated circuits is also explored. To improve the performance of HUDS devices, researchers have mainly focuse...

Microring resonators, due to their ability to enable robust strong light–matter interactions within their structures, have garnered substantial interest for their utility in sensing applications, particularly in the realm of gas detection. However, there is an inherent trade-off between a microring resonator's quality factor and confinement factor...

Hyperuniform disordered solids (HUDS) waveguides, a type of emerging artificial photonic bandgap (PBG) devices, are demonstrated to possess large, complete, and isotropic PBGs, being promising for developing applications in optoelectronics, nonlinear optics, and sensing. However, optical losses of HUDS waveguides are usually limited by giant light...

As an essential supplement to the telecommunication band in optical communication, 2-μm optical communication has garnered substantial research interest since its inception. One practical approach to enhancing communication capacity is the use of wavelength division multiplexing (WDM), in which Bragg gratings have been widely employed in (de)multip...

Mid-infrared (Mid-IR) thermo-optic phase shifters are key components in tremendous optoelectronic applications ranging from free-space communications to optical ranging. However, few studies reported the feasibility of developing mid-IR thermo-optic phase shifters based on silicon photonics foundries, which have been widely exploited in the telecom...

Transverse-magnetic (TM)-mode silicon waveguide devices have diverse on-chip applications in biochemical sensing, photodetection, and nonlinear optics, due to their unique light field distributions. The grating coupler technique provides a practical solution for coupling light into/out of TM-mode silicon waveguides. In this paper, we theoretically...

Subwavelength grating structures are widely used in integrated optical devices due to their compact footprints and flexible refractive index tailoring. In this paper, we present a subwavelength grating (SWG) coupler for a 70-nm-thick silicon waveguide without the upper cladding. The device was designed by using a particle swarm optimization algorit...

Low-dimensional material-based heterogeneous silicon photonics has attracted significant attention due to their applications in developing integrated optoelectronic devices from the telecommunication band to mid-infrared wavelengths. However, the study of waveguide components integrated with low-dimensional materials for mode-division multiplexing...

Spectroscopy plays a pivotal role in discerning the chemical and biochemical compositions of analytes, significantly impacting chemical and material analysis, disease diagnosis, environmental monitoring, and space exploration. Despite the widespread demand for optical spectrometers in both industry and academia, their deployment in many practical a...

In this article, a broadband compact Si3N4-on-SOI platform-based hybrid plasmonic waveguide (HPW) for polarization beam splitters (PBS) have been proposed for low insertion loss (IL) and high extinction ratio (ER). The proposed PBS consists of two parallel waveguides separated by a gap. One waveguide is HPW, consisting of a Si/Si3N4/Au stake separa...

We demonstrate a high-speed waveguide-integrated tellurium photodetector on a silicon nitride platform. At a wavelength of 1570 nm, the photodetector has a measured responsivity of 0.5 A W ⁻¹ at 1 V bias voltage and a bandwidth of 12 GHz.

Short-wavelength mid-infrared (SWMIR) silicon photonics has gained significant attention due to its applications in sensing, spectroscopy, and communications. A perfectly vertical grating coupler is a valuable packaging technique that is convenient for chip-to-chip optical interconnects and has low risks of mechanical failure during testing. Howeve...

Mid-infrared (mid-IR) silicon photonics holds promising applications for the Internet of Things, LiDAR, and optical communications. Perfectly vertical grating couplers are superior mid-IR light coupling techniques, featuring ease of packaging, positioning flexibility, and mass production scalability. However, high-efficiency mid-IR perfectly vertic...

This article addresses the past, present, and future status of hybrid plasmonic waveguides (HPWs). It presents a comprehensive review of HPW-based photonic integrated circuits (PICs), covering both passive and active devices, as well as potential application of on-chip HPW-based devices. HPW-based integrated circuits (HPWICs) are compatible with co...

Subwavelength grating (SWG) couplers have attracted great attention in silicon photonics due to the flexible capacity of index tailoring for light coupling. With the intrinsic high refractive index (RI), silicon SWG couplers usually suffer from poor tolerance to device fabrication errors, moderate coupling bandwidth, and large back reflection. Alth...

Mid‐infrared (Mid‐IR) integrated optics has tremendous applications in spectroscopic sensing, imaging, and ranging. Compared with visible light and near‐IR wavelengths, the study of mid‐IR photonic integrated devices is limited due to the need for more suitable materials and designs for constructing high‐performance on‐chip optoelectronic devices....

Optical bistability can be used to explore key components of all-optical information processing systems, such as optical switches and optical random memories. The hybrid integration of emerged two-dimensional layered PtSe2 with waveguides is promising for the applications. We demonstrated the optical bistability in the PtSe2-on-silicon nitride micr...

In this paper, we introduce an intensity demodulation method for the optical Vernier effect, based on an intelligent algorithm. To reduce the requirement for a large number of pre-collected raw spectra for the training of the three-layer neural network, a spectrum interpolation scheme was incorporated. With the proposed method, the measurand can be...

We demonstrate giant mid-infrared light absorption of a PtSe 2 -on-silicon waveguide by integrating a PtSe 2 film on an ultra-thin silicon waveguide, opening an avenue to developing high-performance optoelectronic integrated circuits.

Although deep learning-based methods have achieved great success in various polarimetric imaging tasks, the performance and the generalization ability are strongly dependent on massive training data, which is a critical limitation and limits the practical applications. In this paper, for the first time to our knowledge, we present a deep transfer l...

In this Letter, we present a self-supervised method, polarization to polarization (Pol2Pol), for polarimetric image denoising with only one-shot noisy images. First, a polarization generator is proposed to generate training image pairs, which are synthesized from one-shot noisy images by exploiting polarization relationships. Second, the Pol2Pol me...

Water probing based on lanthanide-doped upconversion nanoparticles (UCNPs) has aroused great interest due to the advantages of high photostability, short response time, no autofluorescence background, and low toxicity. Compared with widely used Er3+-doped UCNPs, Tm3+-doped UCNPs are not considered as efficient water probes due to the phonon energy...

Mid-infrared (Mid-IR) Kerr frequency combs have great application potential in sensing and spectroscopy. To generate a Kerr frequency comb, a continuous-wave, wavelength-tunable, narrow-linewidth, low-noise laser is normally utilized to pump a high-nonlinearity micro-resonator to emit a large number of coherent and equally spaced modes. However, ch...

Color polarimetric imaging could provide multi-dimensional information that provides physical properties related to object shape, surface roughness, etc. Therefore, it has been widely used in various instrumentation and measurement applications, such as 3D measurement, surface detection, and navigation. However, compared to conventional color image...

In this paper, fiber sensor based on Vernier effect for simultaneous measurement of relative humidity (RH) and temperature is proposed. The sensor is fabricated by coating two kinds of ultraviolet (UV) glue with different refractive indexes (RI) and thicknesses on the end face of a fiber patch cord. The thicknesses of two films are controlled to ge...

Reduced resolution of polarized images makes it difficult to distinguish detailed polarization information and limits the ability to identify small targets and weak signals. A possible way to handle this problem is the polarization super-resolution (SR), which aims to obtain a high-resolution polarized image from a low-resolution one. However, comp...

In this work, we experimentally demonstrate a passband filter for the 2-µm wave band on the silicon-on-insulator platform. The device consists of a strip waveguide and an apodized subwavelength-structured waveguide. Fabricated on a 340-nm-thick silicon membrane, the proposed passband filter shows a 3-dB bandwidth of 16–33 nm, a high sidelobe suppre...

In this paper, fiber sensor based on Vernier effect for simultaneous measurement of relative humidity (RH) and temperature is proposed. The sensor is fabricated by coating two kinds of ultraviolet (UV) glue with different refractive indexes (RI) and thicknesses on the end face of a fiber patch cord. Vernier effect is formed by the inner lower-RI po...

Compensating the temperature dependency and the slight nonlinearity of the magneto-optic response of a fiber optic current sensor (FOCS) are crucial to improve its accuracy. In this paper, the nonlinearity originations of the FOCS with the static-biasing scheme for temperature compensation are analyzed and characterized. We found that the temperatu...

Mid-infrared (Mid-IR) (2–20 µm) silicon photonics has attracted much attention in the past few years due to its application potential in free-space optical communications, light detection and ranging, and molecular analysis. The grating coupler technology is one of the most widely employed approaches for light coupling between optical fibers and wa...

In this paper, a hybrid plasmonic waveguide (HPW) that has a low optical loss with variable nonlinearity (γ) and ultralow dispersion (D) has been proposed. We analyzed and compared four different light confinement regions in the proposed HPW structure, namely air, SiO2, Si3N4, and Al2O3 based on Si3N4 and SiO2 platforms. The optimized HPW gives the...

Short-wavelength mid-infrared (2-2.5 µm waveband) silicon photonics has been a growing area to boost the applications of integrated optoelectronics in free-space optical communications, laser ranging, and biochemical sensing. In this spectral region, multi-project wafer foundry services developed for the telecommunication band are easily adaptable...

Silicon photonics has been studied in various areas by providing small-footprint, high-performance, and mass-producible optoelectronic components integrated on a chip. For the photonic packaging, ultraviolet (UV) curing techniques have been widely utilized. Meanwhile, silica cladding absorption to UV light could alter its refractive index (RI), aff...

In this Letter, we propose an attention-based neural network specially designed for the challenging task of polarimetric image denoising. In particular, the channel attention mechanism is used to effectively extract the features underlying the polarimetric images by rescaling the contributions of channels in the network. In addition, we also design...

Polarimetric imaging has prominent advantages in scattering media. Emerging learning-based polarimetric technologies has succeeded but heavily relied on paired data corresponding to the same scenes. In this paper, we propose an unsupervised method for the unpaired underwater-image recovery with a polarimetric generative adversarial network, named U...

On-chip Kerr frequency combs open up unprecedented opportunities for developing compact, low-cost, and high-density wavelength-division multiplexing (WDM) techniques for optical communications and optical interconnects. However, to achieve high-density WDM channels, a large-radius microring could be used to develop a Kerr frequency comb with a smal...

As we enter the post-Moore era, heterogeneous optoelectronic integrated circuits (OEICs) are attracting significant attention as an alternative approach to scaling to smaller-sized transistors. Two-dimensional (2D) materials, offering a range of intriguing optoelectronic properties as semiconductors, semimetals, and insulators, provide great potent...

Short-wavelength mid-infrared (mid-IR) (2-2.5 μm wavelengths) photonics has tremendous applications in optical communication, ranging, satellite remote sensing, disease diagnosis, and military defense. As key components of short-wavelength mid-IR optical systems, integrated optoelectronic devices have attracted great attention in the past decades....

Silicon devices have attracted much attention due to their application potential in high-density photonic integrated circuits (PICs). However, it is still challenging to realize light routing within a micro-sized region due to high optical losses introduced by sharp waveguide bends (WBs). Here, we propose and design an ultra-broadband WB with a ben...

Mid-infrared (mid-IR) silicon photonics has been attracting great attention due to its tremendous potential applications in nonlinear optics, ranging, sensing, and spectroscopy. To date, mid-IR silicon devices have usually been developed based on silicon wafers with top-layer silicon thicknesses of hundreds of nanometers. Compared with the thick si...

In the above paper [1] there are errors which we correct here.

Temperature cross-sensitivity is the main obstacle to the practical application of fiber current sensors based on the garnet crystal Faraday rotator. In this paper, a temperature compensation method is proposed and experimentally demonstrated. By introducing an appropriate static bias to the sensor, temperature compensation can be realized by simpl...

Mid-infrared (Mid-IR) Kerr frequency combs, which emit board, discrete, and evenly spaced laser frequencies in the spectral region of 2-20 µm, are expected to bring us tremendous applications from molecular spectroscopy to astronomy science. To develop mid-IR Kerr frequency combs, Ge has attracted significant attention due to its unique merits of a...

We demonstrate on-chip chiral-field-enhanced Raman optical activity (ROA) by tailoring a dark mode excited in a silicon nanodisk array. We show >100x enhanced chiral light-molecule interaction with negligible artifacts for ROA measurement of biological enantiomers.

Spot size converters (SSCs) are essential optical components that connect waveguides with different modal spot sizes for adiabatic light coupling. However, previous SSCs usually suffer from large sizes or limited coupling efficiencies, which are not conducive to develop large-scale and high-density photonic integrated circuits (PICs). Herein, we th...

Metasurfaces analogues of Fano resonances provide a powerful platform for high sensitivity sensing, nonlinear optics, and light manipulation. However, previous Fano-resonant metasurfaces usually are not compatible with silicon complementary metal-oxide semiconductor circuits due to their hybrid material structures and large non-radiative loss. Here...

The temporal response, especially characteristics of luminescence intensity decay, of lanthanide ions (Ln3+) doped upconversion materials has attracted much attention for its significance in understanding upconversion mechanisms and developing fluorescence lifetime-based applications. However, a detailed explanation concerning the temporal response...

Mid-infrared (mid-IR) microring resonators (MRRs) have been extensively studied for biochemical sensing. However, the temperature fluctuation is an undesirable cross-sensitive effect for refractive index (RI) sensing. Here, we study an electric-field-assisted resonance scanning (EARS) spectroscopic technique based on a graphene-on-silicon dual-mode...

Silicon photonic integrated circuits (PICs) at 2.2-2.5 μm wavelengths have great potential in applications of nonlinear optics, spectroscopy, and light detection and ranging, due to the merits of the moderate two-photon absorption and Rayleigh scattering from the waveguide sidewall roughness. As key components in silicon PICs, grating couplers at s...

Previous polarization underwater imaging methods based on the physical scattering model usually require background region included in the image and the prior knowledge, which hinders its practical application. In this paper, we analyze and optimize the physically feasible region and propose an improved method by degenerating intermediate variables,...

Luminescence properties of upconverting nanomaterials are significantly influenced by host structures. Even though previous studies have demonstrated various modulation approaches of host structures on upconversion luminescence, in-situ host transition has been hardly realized. In this paper, we demonstrate in-situ host-transition-induced upconvers...

Polarimetric imaging is an effective way for enhancing the image quality in underwater environments. Previous polarization-based methods for underwater imaging actually involve both optical and digital processing, while compared with digital processing, the importance of the optical method is not clear. In this paper, we propose a polarimetric meth...

Polarization information is valuable for image de-scattering in turbid media. Previous polarimetric image de-scattering methods tend to employ the illumination with a fixed polarization state, while the effect of the polarization state of active illumination on the target is less considered. In this paper, a computational polarization differential...

The on-chip mode-division multiplexing (MDM) is an attractive technique to achieve high-capacity optical transmissions by using a single-wavelength carrier. In traditional schemes, multiple channels with a fundamental mode are modulated by parallel arranged electro-optic modulators and then converted to high-order modes. However, the method is usua...

Subwavelength gratings refer to periodic structures that have a period less than half the wavelength of light in the material so that no Bragg diffraction mode is supported. Instead, the light will propagate as if it was in a homogeneous material with anisotropic refractive indices. Subwavelength gratings have attracted great interest recently, as...

Subwavelength gratings refer to periodic structures that have a period less than half the wavelength of light in the material so that no Bragg diffraction mode is supported. Instead, the light will propagate as if it was in a homogeneous material with anisotropic refractive indices. Subwavelength gratings have attracted great interest recently, as...

Raman optical activity (ROA) is effective for studying the conformational structure and behavior of chiral molecules in aqueous solutions and is advantageous over X-ray crystallography and nuclear magnetic resonance spectroscopy in sample preparation and cost performance. However, ROA signals are inherently minuscule; 3–5 orders of magnitude weaker...

Surface-enhanced Raman spectroscopy (SERS) based on two-dimensional (2D) materials has attracted great attention over the past decade. Compared with metallic materials, which enhance Raman signals via the surface plasmon effect, 2D materials integrated on silicon substrates are ideal for use in the fabrication of plasmon-free SERS chips, with the a...

Lanthanide ions doped upconversion luminescence materials have attracted great attention due to their potential applications in anti-counterfeiting, volumetric display, optical multiplexing, and bioimaging. Previous studies showed that it is possible to control transient states of lanthanide ions, enabling a large luminescence color gamut in one fi...

On-chip optical gas sensors, which use resonant shifts of cavities to detect molecular concentrations, have the advantages of high sensitivity, real-time detection, and compact footprint. However, such sensors are usually limited by a serious cross-sensitivity issue induced by environmental temperature variations. To overcome this limitation, we st...

Stimulus-triggered drug delivery systems (DDSs) based on lanthanide-doped upconversion nanoparticles (UCNPs) have attracted intensive attention for treating cancers due to the merits of high drug availability, precisely controlled drug release, and low side-effects. However, such DDSs usually exhibit a single stimulus-response, which may limit the...

Underwater images always suffer low contrast and inaccurate colors due to the scattering and absorption by the particles when the target light propagates through the turbid water. In this paper, we first found that a lot of intensity space is occupied by fewer pixels called "tails" on both sides of the histograms for RGB channels of the image. Base...

Water sensing is of great importance in wide applications of biomedicine, precision agriculture, chemical industrial processes, and food inspection. As a promising probe to detect water molecules, lanthanide-doped upconversion nanoparticles have drawn rapidly increasing research interest with the merits of the high photostability, fast response, an...

We demonstrated a focusing subwavelength grating coupler which has a maximum coupling efficiency of -9.7 dB at a center wavelength of 2.47 μm with a 1-dB bandwidth of 60 nm.

We synthesized and characterized a new type of ZrV 2 O 7 :Yb ³⁺ /Er ³⁺ crystals, whose upconversion luminescence color can be controlled by adjusting temperature.

Yb 3+-Tm 3+ co-doped NaGdF 4 (NaGdF 4 :Yb 3+ /Tm 3+) nanoparticles have great application potential in bioimag-ing, display, and photovoltaics, due to their merits of superior photostability, high resistance to photobleaching, deep light penetration depth, large anti-Stokes shifts, and rich emission bands. To achieve efficient lumi-nescence, it is...

Compact and smart optical gas sensors have attracted significant attention over the past few decades. Among the materials used for developing such gas sensors, group-IV materials, including silicon, germanium, carbon allotropes, and their compounds, are considered the most promising candidates. By virtue of their inherent compatibility with the CMO...