Invited Speakers

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Stabilizing mode locked laser directly reference to atomic two photon transition- toward developing 104 clocks utilizing one Cs-Rb mixed cell

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We directly lock the mode frequency of comb laser against atomic transition recommended by BIPM. Here we report a 6-cm Rb-Cs mixed cell based comb clocks and the investigations on related systematic errors, in which new technologies for removing the Doppler background and for controlling the comb frequency are presented .

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Computing resources and machine learning have made a rapid progress in the last decade. In this trend, many efforts based on deep learning were made upon the imaging technology. Inspired by the computer science community which mostly focus on the data interpretation, computational optics investigated more configuration about the image formation. In this study, I will present some data-driven works including image denoising, phase retrieval and unconventional imaging system based on the deep learning neural network.

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Metasurface holography with phase-change materials

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Metasurfaces are planar devices containing nanoantennas or resonator arrays that allow for beam shaping, super resolution imaging, and holography. Metasurface holography technology combines a computer-generated hologram with a nanoscale device. Hybrid metasurfaces with tunable phase change materials provide a platform for active modulation of wavefronts. and opportunities for switchable functionalities.

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Scanning fringe projection in shallow depth of fields for 3D measurement

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Fringe projection profilometry is a powerful and useful tool in three-dimensional measurements for many applications. We present a scanning approach using fringe projection in different shallow depth of fields along z-axis to retrieve and rebuild the surface of a small inspected object. The designed fringe pattern is projected on the inspected object with a shallow depth of field. Then, a CCD is used to capture the image of the inspected object with projected fringe in a narrow depth of field. A 2D contour of the inspected surface addressed by the in-focused fringes is obtained in one scanning process. The retrieved images from the scanning process are assembled to build the 3D surface of the inspected object. Based on the limited depth-of-field of the pattern projection system and the limited depth-of-focus of the image acquisition system, the precision of the profilometry system is improved.

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We discuss the trade-off caused by the system parameters, and the performance degradation caused by the angular momentum of the rotational motor for shifting multiplexing. We also propose applying phaseintegrated double-frequency grating shearing interferometer (PI-DFGSI) to makes the reading with moving disc being possible, and thus improves the system performance.

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Design and Fabrication of Polarization-selective Substrate-mode Volume Holograms

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A prism-hologram-prism sandwiched recording method is proposed for the fabrication of polarization-selective substrate-mode volume holograms with a large diffraction angle. The method belongs to a technique of longer-wavelength construction for shorterwavelength reconstruction and is much easier than that of traditional method which has high application potential in holographic photonics.

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Advantages of Bessel beam in optogenetic manipulation at the subcellular scale

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Manipulating and Enhancing Optical Performance of OLEDs with Curved and 3D Structures

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We report the fabrication and property of multifunctional electrospun nanofiber chemosensor and perovskite based light-emitting diodes. RGB full-color-switchable chemosensors that are able to simultaneously detect pH and Hg2+ and are based on highly porous fluorescent electrospun nanofibers. Perovskite QDs embedded into polymeric to increase the photostability of light emitters for applications to lighting and backlight displays.

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InGaN-based red LEDs using strain-compensated MQWs with AlN/AlGaN barriers

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The InGaN active region contains a large amount of indium to emit red light. The high-In-content InGaN has a large lattice mismatch to the p- or n-GaN layers, resulting in the introduction of a huge number of defects, interface roughness, and weaker light emission. However, we have improved the performance of red LEDs by introducing AlN/AlGaN barrier layers among InGaN QWs. Such strain control is the crucial point to realize higher efficiency.

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Tunnel Oxide Passivated Contact Structure for High Efficiency Solar Cell and Module Applications

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An advanced structure composite of poly-Si/ tunnel SiO2 as passivation contact has been developed and realized for solar cell applications. The passivation result with implied open circuit voltage (iVOC) of 726 mV and carrier lifetime of 5004 μs were examined. By applying this passivation structure to c-Si photovoltaics, Tunnel Oxide Passivated Contact (TOPCon) solar cells were developed and revealed a promising result with efficiency >23%. The module made by these TOPCon solar cells with high performance of 20.7% efficiency and 352W power was obtained.

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Earth-abundant Metal Chalcogenide Materials for Photovoltaics: Cu₂ZnSn(S,Se)₄ and Cu₂BaSn(S,Se)₄

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The development of renewable energy is a trend in the world. And developing thin-film solar cells, which utilize photovoltaic effect to convert light energy into electrical energy, will play a key role in the global trend. Chalcogenide based thin-film photovoltaics such as CdTe and Cu(In,Ga)Se₂ (CIGSe) have achieved remarkable over 20% power conversion efficiency (PCE). These thin-film materials have wide spectral response ranges and high absorption coefficients, so they are sensitive to weak light. However, the toxicity of cadmium (Cd), and the scarcity of indium (In) and tellurium (Te) may restrict the production capacity for a growing worldwide power consumption (~terawatt). Therefore, the development of low-cost, earth-abundant thin-film solar cells have attracted a lot of attention. the new generation metal chalcogenides: Cu₂ZnSn(Se,S)₄ (CZTSSe) and Cu₂BaSn(S,Se)₄ (CBTS) will be two of the most potential alternative photovoltaic energy materials due to its abundant, non-toxic elements and providing desirable optoelectronic properties, similar to CIGSSe. In this talk, I will share some of our recent progresses on CZTSSe and CBTS:

(1) Interface engineering of CdS/CZTS(Se) is an important aspect of improving the performance of buffer/absorber heterojunction combination. It has been demonstrated that the crossover phenomenon due to the interface recombination can be drastically eliminated by interface modification. Here, we present a comprehensive study on the effects of soft-baking (SB) temperature on the junction properties and the corresponding optoelectronic and interface-structural properties;

(2) we used vacuum process to synthesis the CBTSSe absorber and performed Raman, X-ray diffraction (XRD), photoluminescence (PL) measurements as the tools to understand the quality and the information of phase identification. Based on the results, the two-step prepared CBTSSe absorbers with tunable bandgap has been successfully demonstrated.

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Dispersion-engineered TiO2 metasurfaces

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Optical dispersion results from the index of refraction of a material varying with the frequency of incident light. Accurate control over this property is vital. For example, it mitigates pulse spreading in optical fibers, which are the backbone of modern telecommunications, and enables pulse compression in ultrafast laser optics (2018 Nobel Prize in Physics). In this talk, I will begin with an introduction to the design, simulation, and fabrication of metasurface components with a focus on metalenses. Subsequently, I will illustrate how to control metasurface dispersion by customizing the group delay and group delay dispersion of constituent nanostructures. Such dispersion-engineered metasurfaces enable achromatic metalenses, aberration-corrected spectrometers, as well as lens-aberration correctors designed for simple singlets to complicated microscope objectives. My talk will be summarized by detailing on-going works involving metasurface-enabled superachromatic and broadband high-efficiency lenses and pointing out future emerging applications. These demonstrations are vastly applicable to machine vision, autonomous vehicles, optical communication, augmented and virtual reality devices, and more.

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Three dimensional optical metamaterials and advanced optical components at TIRI

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