Modern data center networks (DCNs) require optical switches with ultra-low loss, ultra-fast reconfiguration speed, high throughput, and high extinction ratio performances. In this work, we propose the design of a 5 x ...
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Modern data center networks (DCNs) require optical switches with ultra-low loss, ultra-fast reconfiguration speed, high throughput, and high extinction ratio performances. In this work, we propose the design of a 5 x 5 optical switch at 1550 nm based on a piezo-actuator serving as a translating input optical source, and a beam-steering system built of spherical lenses to complete the switching behaviour. An ultra-fast actuator switching speed is estimated as 1.55 mu s latency for a single connection with a demo circuit. We further simulate the beam-steering system end-to-end in a commercial opticaldesign software CODE V and demonstrate a theoretical 2.16 dB insertion loss for a single connection in the switch at optimum alignment.
We propose a new method for integrating metasurfaces in opticaldesign using semi-analytical modeling of dielec-tric nanostructures. The latter computes the output phase of an electric field incident on the metasurfac...
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We propose a new method for integrating metasurfaces in opticaldesign using semi-analytical modeling of dielec-tric nanostructures. The latter computes the output phase of an electric field incident on the metasurface, allowing their use with ray-tracing software. This tool provides a method to use metasurfaces in opticalsystems while using built-in optimization processes to avoid time-consuming computation. To demonstrate the applicability and versa-tility of our method, we present variations of a triplet composed of refractive elements and a metasurface. For each of the systems, similar optical performances are achieved. Our unique and innovative approach to joining meta -surfaces and ray-tracing has the potential to promote the design of innovative systems by exploiting the richness of metasurfaces and the functionality of conventional lens design software.(c) 2022 Optica Publishing Group
Compressive spectral imaging (CSI) is an advanced computational imaging approach to reconstruct the threedimensional (3D) spatio-spectral data cube of a target scene through a single or a few snapshots. However, limit...
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Compressive spectral imaging (CSI) is an advanced computational imaging approach to reconstruct the threedimensional (3D) spatio-spectral data cube of a target scene through a single or a few snapshots. However, limited by the response range of the image detector, the existing CSI systems mostly work within narrow spectral bands, such as the visible or shortwave-infrared (SWIR) spectral band. The work band of the CSI system constrains the detection capacity for the targets under complex environments (such as rain, snow, haze, etc.). In addition, most of the current CSI prototypes lack engineeringdesign for practical applications. This paper develops a novel, to the best of our knowledge, opticaldesign scheme of a broadband CSI system with co-aperture coding to simultaneously realize visible multi-spectral imaging (10 channels) and SWIR super-resolution imaging (16x). The freeform surfaces are used to design the front-end reflective objective lens, thus significantly improving the image quality and spatial modulation precision of the system. By means of performance evaluation and tolerance analysis, excellent image quality and manufacturability of the proposed system are demonstrated. (c) 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.
Breaking the diffraction limit has been a key challenge in opticalengineering and super-resolution imaging. In this work, we utilize a vectorial Debye integral neural network to design sub-diffraction focusing fields...
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Breaking the diffraction limit has been a key challenge in opticalengineering and super-resolution imaging. In this work, we utilize a vectorial Debye integral neural network to design sub-diffraction focusing fields for high-NA objectives. By training the polarization states of incident light, we flexibly achieve transitions from diffraction-limited focusing to superoscillatory regimes. Through parameter adjustments, we optimize focal spot size, energy efficiency, and sidelobe distribution, achieving a focus with a 0.367 lambda FWHM and enhanced energy utilization. This method significantly simplifies the design process and demonstrates great potential for advanced optical applications, including super-resolution imaging and 3D field engineering. (c) 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
We propose a method to design the exact phase profile of at least one metasurface in a stigmatic singlet that can be made to implement a desired ray mapping. Following the generalized vector law of refraction and Ferm...
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We propose a method to design the exact phase profile of at least one metasurface in a stigmatic singlet that can be made to implement a desired ray mapping. Following the generalized vector law of refraction and Fermat's principle, we can obtain exact solutions for the required lens shape and phase profile of a phase gradient metasurface to respect particular ray conditions (e.g., Abbe sine) as if it were a freeform refractive element. To do so, the method requires solving an implicit ordinary differential equation. We present comparisons with Zemax simulations of illustrative designed lenses to confirm the anticipated optical behaviour.
Two-mirror telescopes possess an agreeable tradeoff between performance and complexity that suits the needs of many scientific tasks, and recent developments in manufacturing technology have enabled unobscured two-mir...
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Two-mirror telescopes possess an agreeable tradeoff between performance and complexity that suits the needs of many scientific tasks, and recent developments in manufacturing technology have enabled unobscured two-mirror designs with freeform surfaces. We illustrate how structural aberration coefficients reveal the fundamental aberration characteristics of such systems and provide a summary table of general solutions that prescribe freeform surface shapes and tilts. Two unobscured design forms with remarkable aberration cancellation, inspired by well-known on-axis anastigmatic solutions, are presented. (c) 2024 Society of Photo-optical Instrumentation Engineers (SPIE)
Subject of study. This study presents the design of optical-mechanical paths for duplex laser space-communication systems, including configurations with a common receiving and transmitting channel and those with separ...
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The heliostat field is a critical component in the solar energy harnessing process of concentrated solar thermal (CST) central tower systems, which typically represents approximately 45% of the total capital cost of c...
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The heliostat field is a critical component in the solar energy harnessing process of concentrated solar thermal (CST) central tower systems, which typically represents approximately 45% of the total capital cost of commercial plants. In commercial CST central tower systems, the heliostat field is composed of thousands of heliostats incorporating precision-engineered mirrors, which direct sunlight towards a central receiver. Typically, the mirrors maintain a fixed geometry, usually of parabolic shape, during the sun-tracking process, which is optimized to maximize the annual optical performance. However, such a design leads to subdaily energy losses stemming from alterations of the mirror geometry and from astigmatism errors. To achieve and maintain peak optical efficiency throughout the day, the adoption of variable-shape heliostats emerges as a promising solution. This review assesses the current state-of-the-art, the challenges, and the emerging trends and future directions for two types of heliostat technologies, the single facet and the multifaceted variable-focus adaptive optics heliostats. Single-facet heliostats have shown promise due to their simplified design and lower costs compared to multifaceted heliostats. However, achieving precise tracking and focusing remains a significant challenge, particularly in large-scale applications. In contrast, multifaceted heliostats provide superior accuracy and optical performance but are associated with increased design and operational complexity. While these technologies are still under development, advancements in design, materials, control systems, and tracking mechanisms highlight promising trends for the future.
A systematic standard for developing light extraction technologies that can improve the efficiency of lighting systems based on the opticaldesign method of flat-type lighting devices needs to be established. The desi...
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A systematic standard for developing light extraction technologies that can improve the efficiency of lighting systems based on the opticaldesign method of flat-type lighting devices needs to be established. The design of a flat-type lighting device was investigated, considering the utilization of precise processing techniques that simplify the manufacturing process. These techniques adjust the processing variables of the geometric pattern of the light guide plate (LGP), light-emitting diodes (LEDs), which are placed on the sides of the LGP, and viewing angle. The amount of light lost was reduced by etching the light-incident surface of the LGP as a curved shape. A pattern spacing of 9 mm was used to control four LEDs placed in the middle of each side of the LGP with a viewing angle of 120 deg and four LEDs placed at the corners with a viewing angle of 60 deg. In addition, hotspot generation was prevented by controlling the amount of light concentrated in the light-incident area, and the illuminance uniformity of the LGP was confirmed to be 95%, showing an improved optical efficiency. By controlling only the pattern spacing, position of the light source, and viewing angle of the LEDs, the optimal design conditions to improve the optical efficiency of the flat-type lighting device were established. It was found that these parameters can sufficiently improve the imbalance caused by the concentration and loss of light. (c) 2024 Society of Photo-optical Instrumentation Engineers (SPIE)
This article focuses on the application of digital engineering in diffractive optics for precision laser material processing. It examines methods for the development of diffractive optical elements (DOEs) and adaptive...
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This article focuses on the application of digital engineering in diffractive optics for precision laser material processing. It examines methods for the development of diffractive optical elements (DOEs) and adaptive management approaches that enhance the accuracy and efficiency of laser processing. Key achievements are highlighted in numerical modeling, machine learning applications, and geometry optimization of opticalsystems, along with the integration of dynamic DOEs with laser systems for adaptive beam control. The discussion includes the development of complex diffractive structures with improved characteristics and new optimization approaches. Special attention is given to the application of DOEs in micro- and nanostructuring, additive manufacturing technologies, and their integration into high-performance laser systems. Additionally, challenges related to the thermal stability of materials and the complexity of adaptive DOE control are explored, as well as the role of artificial intelligence in enhancing laser processing efficiency.
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