Explanipedia

Generalized Van Cittert-Zernike Schell propagator: an efficient algorithm for simulating partially coherent light Open

Manuel Montoya, Maria Lopera Acosta, Yunfeng Nie, David Blinder · 2025

We present a wave propagation algorithm that models the diffraction of partially spatially coherent light and can be efficiently computed using a single forward propagation. The model uses the Van Cittert-Zernike theorem to find the comple…

Polarization-resolved Off-axis Lensless Microscopy using a Holographic Optical Element Open

Maria Lopera Acosta, Yunfeng Nie, Heidi Ottevaere, Carlos Trujillo · 2025

Lensless holographic microscopy offers exceptional simplicity, but in its conventional in-line geometry, the desired object term is superimposed with the unwanted background and conjugate (“twin-image”) terms, limiting proper information r…

Combined rule-based and generative artificial intelligence in the design of smartphone optics Open

Nenad Zoric, Marie-Anne Burcklen, Lijo Thomas, Momčilo Krunić, Yunfeng Nie , et al. · 2025

This paper reports on a study of design methodology for smartphone lenses utilizing generative and rule-based artificial intelligence (AI) algorithms. The proposed innovative design method utilizes the GPT-4, an OpenAI model, to generate m…

Deep learning for endoscopic depth estimation: A review Open

Xiongzhi Wang, Boyu Yang, Min Wei, Liangfa Liu, Jingang Zhang , et al. · 2025

Combined Rule-Based and Generative Artificial Intelligence in the Design of Smartphone Optics Open

Nenad Zoric, Simon Thibault, Marie-Anne Burcklen, Lijo Thomas, Momčilo Krunić , et al. · 2025

This paper reports on a study of design methodology for smartphone lenses utilizing generative and rule-based artificial intelligence (AI) algorithms. The proposed innovative design method utilize the GPT-4, an OpenAI model to generate mac…

Polarization-resolved Off-axis Lensless Microscopy using a Holographic Optical Element Open

Maria J. Lopera, Yunfeng Nie, Heidi Ottevaere, Carlos Trujillo · 2025

Logarithmic Dynamic Range for Improved Digital Lensless Holographic Microscopy Reconstructions Open

Maria J. Lopera, René Restrepo, Yunfeng Nie, Heidi Ottevaere, Carlos Trujillo · 2025

Lensless Mueller holographic microscopy with robust noise reduction for multiplane polarization imaging Open

Maria J. Lopera, Mikołaj Rogalski, Piotr Arcab, Marzena Stefaniuk, Yunfeng Nie , et al. · 2024

Portable Digital Lensless Holographic Microscope for fieldwork applications using a conventional smartphone sensor and a customized freeform lens. Open

Maria Lopera Acosta, Yunfeng Nie, Heidi Ottevaere, Carlos Trujillo · 2024

Despite the widespread exploration and application of Digital Lensless Holographic Microscopes (DLHMs), there remains a scarcity of portable implementations tailored specifically for fieldwork applications such as remote diagnosis, medical…

Portable Digital Lensless Holographic Microscope for fieldwork applications using a conventional smartphone sensor and a customized freeform lens. Open

Maria Lopera Acosta, Yunfeng Nie, Heidi Ottevaere, Carlos Trujillo · 2024

Despite the widespread exploration and application of Digital Lensless Holographic Microscopes (DLHMs), there remains a scarcity of portable implementations tailored specifically for fieldwork applications such as remote diagnosis, medical…

Miniaturized Multi-Channel Confocal Fluorescence Detection Using Freeform Optics and Spectrometry Open

Yunfeng Nie, Tomohiko Suzuki, Heidi Ottevaere · 2024

Lensless Mueller Holographic Microscopy with Robust Noise Reduction for Multiplane Polarization Imaging Open

Maria J. Lopera, Mikołaj Rogalski, Piotr Arcab, Marzena Stefaniuk, Yunfeng Nie , et al. · 2024

End-to-End Aberration Correction Network for Enhancing Miniature Microscope Resolution Open

Yunfeng Nie, Runmu Su, Jingang Zhang, Heidi Ottevaere · 2024

Image Quality Is Not All You Want: Task-Driven Lens Design for Image Classification Open

Xinge Yang, Qiang Fu, Yunfeng Nie, Wolfgang Heidrich · 2023

In computer vision, it has long been taken for granted that high-quality images obtained through well-designed camera lenses would lead to superior results. However, we find that this common perception is not a "one-size-fits-all" solution…

Realistic Digital Lensless Holographic Microscopy Modeling: Diffraction, Magnification and Distortion Effects Open

Maria J. Lopera, Jorge Garcı́a-Sucerquia, Yunfeng Nie, Heidi Ottevaere, Carlos Trujillo · 2023

A pin-based pyro-electrohydrodynamic jet sensor for tuning the accumulation of biomolecules down to sub-picogram level detection Open

Simona Itri, Danila del Giudice, Martina Mugnano, Volodymyr Tkachenko, Sanna Uusitalo , et al. · 2022

Freeform optics design method for illumination and laser beam shaping enabled by least squares and surface optimization Open

Alejandro Sánchez, Fabian Duerr, Yunfeng Nie, Hugo Thienpont, Heidi Ottevaere · 2022

Freeform tailoring optics are core components in advanced illumination and laser technologies. In this work, we propose an efficient and streamlined optics design method to face the challenges in its implementation. We integrate ray-mappin…

Compact Shortwave Infrared Imaging Spectrometer Based on a Catadioptric Prism Open

Lei Feng, Xiaoying He, Yacan Li, Lidong Wei, Yunfeng Nie , et al. · 2022

This article demonstrates a compact prism imaging spectrometer method. A catadioptric curved prism is located at the secondary mirror position of the spectrometer and used to balance the aberrations, enlarge the dispersion width, and decre…

Building and characterizing a fluorescence setup to measure very low concentrations of analytes/biomarkers Open

Nathan Mortiaux, Heidi Ottevaere, Yunfeng Nie · 2022

This training report is the result of my internship in the B-Phot Brussels Photonics team of the VUB that took place between February 3 and April 3, 2020. The project of this internship nds its context in the European SensApp project which…

Building and characterizing a fluorescence setup to measure very low concentrations of analytes/biomarkers Open

Nathan Mortiaux, Heidi Ottevaere, Yunfeng Nie · 2022

This training report is the result of my internship in the B-Phot Brussels Photonics team of the VUB \nthat took place between February 3 and April 3, 2020. The project of this internship nds its context \nin the…

Label-Free Protein Analysis by Pyro-Electrohydrodynamic Jet Printing of Gold Nanoparticles Open

Veronica Vespini, Simonetta Grilli, Pietro Ferraro, Romina Rega, Heidi Ottevaere , et al. · 2022

The pyro-electrohydrodynamic jet (p-jet) printing technology has been used for the fabrication of confined assemblies of gold nanoparticles with a round shape and a diameter ranging between 100 and 200 μm. The surface-enhanced Raman spectr…

Label-Free Protein Analysis by Pyro-Electrohydrodynamic Jet Printing of Gold Nanoparticles Open

Veronica Vespini, Simonetta Grilli, Pietro Ferraro, Romina Rega, Heidi Ottevaere , et al. · 2022

The pyro-electrohydrodynamic jet (p-jet) printing technology has been used for the fabrication of confined assemblies of gold nanoparticles with a round shape and a diameter ranging between 100 and 200 μm. The surface-enhanced Raman spectr…

A Pin-Based Pyro-Electrohydrodynamic Jet Sensor for Tuning the Accumulation of Biomolecules Down to Sub-Picogram Level Detection Open

Simona Itri, Danila del Giudice, Martina Mugnano, Volodymyr Tkachenko, Sanna Uusitalo , et al. · 2022

Freeform imaging system design with multiple reflection surfaces Open

Yunfeng Nie, David Shafer, Heidi Ottevaere, Hugo Thienpont, Fabian Duerr · 2021

Reflective imaging systems form an important part of photonic devices such as spectrometers, telescopes, augmented and virtual reality headsets or lithography platforms. Reflective optics provide unparalleled spectral performance and can b…

High-rate accumulation of tiny aqueous droplets using a pyro-electrohydrodynamic jet system Open

Volodymyr Tkachenko, Reinhard Schwödiauer, Romina Rega, Simona Itri, Martina Mugnano , et al. · 2021

It is well known how the quantification of tiny amounts of molecular species in biological assays is a crucial issue. We present here a deep investigation on a pyro-electrohydrodynamic jet system at aim to demonstrate its capability to acc…

SensApp: a FET-Open project for developing a supersensor able to detect Alzheimer's disease biomarkers in blood Open

Romina Rega, Martina Mugnano, Danila del Giudice, Simona Itr, Volodymyr Tkachenko , et al. · 2021

The goal of the SensApp FET-Open project is to develop an innovative super-sensor that will be able to detect Alzheimer’s disease (AD) biomarkers (β-amyloid, Tau and pTAU) in peripheral blood. Considering that nowadays an accurate diagnosi…

Learnable Reconstruction Methods from RGB Images to Hyperspectral Imaging: A Survey Open

Jingang Zhang, Runmu Su, Wenqi Ren, Qiang Fu, Yunfeng Nie · 2021

This work was supported by the Equipment Research Program of the Chinese Academy of Sciences (NO. YJKYYQ20180039 and NO. Y70X25A1HY), and the National Natural Science Foundation of China (NO. 61775219 , NO.61771369 and NO. 61640422 ). Jing…

Optical design and development of a cost-efficient, compact, super-sensitive scanning confocal fluorescence microscope Open

Yunfeng Nie, Sanna Aikio, Annukka Kokkonen, Sanna Uusitalo, Teemu Sipola , et al. · 2021

Current commercial confocal fluorescence detection instruments are typically sophisticated, bulky and expensive, not suitable for rapid clinic routine detection targeting early fatal disease diagnosis, e.g. Alzheimer’s Disea…

Automated freeform imaging system design with generalized ray tracing and simultaneous multi-surface analytic calculation Open

Yunfeng Nie, DAVID R. SHAFER, Heidi Ottevaere, Hugo Thienpont, FABIAN DUERR · 2021

Recently, freeform optics has been widely used due to its unprecedented compactness \nand high performance, especially in the reflective designs for broad-wavelength imaging \napplications. Here, we present a gen…

Optical design and fabrication of a monolithic, slanted freeform shaper for laser beam shaping Open

Yunfeng Nie, Alejandro Sánchez, Dries Rosseel, Kurt Rochlitz, Hugo Thienpont , et al. · 2021

Flexible and compact beam shaping optical systems are gaining more attention due to their use in a broad range of applications. A monolithic freeform beam shaper for slanted, top-hat illumination is designed and fabricated, demonstrating a…

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