Article
Optics
Francesco Reda, Marcella Salvatore, Fabio Borbone, Pasqualino Maddalena, Antonio Ambrosio, Stefano Luigi Oscurato
Summary: This research demonstrates the realization of a fully reconfigurable flat varifocal diffractive lens, which can be directly manufactured, erased, and reshaped on the surface of an azopolymer film. Integrating the lens into the optical system allows for multi-depth object imaging. This approach provides an effective choice for integrating or substituting modern optical systems for advanced functionalities.
Article
Optics
Wesley A. Britton, Yuyao Chen, Fabrizio Sgrignuoli, Luca Dal Negro
Summary: This paper introduces a novel design of dual-band multi-focal diffractive microlenses with a sub-wavelength thickness of only 235 nm, capable of simultaneously focusing visible and near-infrared spectral bands. Experimental results demonstrate that this microlens can achieve independent focal planes for two targeted spectral bands and encode the depth information of a sample into different spectral images.
LASER & PHOTONICS REVIEWS
(2021)
Article
Multidisciplinary Sciences
Huan Lu, Jiwei Zhao, Bin Zheng, Chao Qian, Tong Cai, Erping Li, Hongsheng Chen
Summary: This study is inspired by the human eye's accommodation mechanism and proposes a supervised-evolving learning algorithm and a neuro-metasurface focusing system. It achieves adaptive focusing for incident waves in different environments, demonstrating unprecedented potential in achromatic, beam shaping, 6G communication, and intelligent imaging.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Leonhard Lenk, Stefan Sinzinger
Summary: Focus-tunable lenses are widely used in optical systems, but correcting chromatic aberrations is still challenging. A combination of lenses and correctors can compensate for chromatic aberrations over a large refractive power range without significantly increasing the system's length.
OPTICAL ENGINEERING
(2023)
Article
Optics
Enrique Moren, Jean-Philippe Colombier
Summary: Axicon lenses generate non-diffracting Bessel beams with a large focal depth, which have important applications in optical signal processing, imaging, material processing, and manufacturing. This paper presents analytical functions to define complex-structured light fields with desired intensity, phase, and polarization distributions. Simulation and analysis of these lenses were performed to verify their electromagnetic output and conservation quantities. The results show the electric field distribution, chirality flux, Poynting vector, and power before and after the lens using discrete fast Fourier transform.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Anqi Ji, Jung-Hwan Song, Qitong Li, Fenghao Xu, Ching-Ting Tsai, Richard C. Tiberio, Bianxiao Cui, Philippe Lalanne, Pieter G. Kik, David A. B. Miller, Mark L. Brongersma
Summary: Phase contrast microscopy is a crucial tool in modern biology, geology, and nanotechnology. In this article, a new approach using a guided-mode-resonator metasurface is proposed for phase contrast imaging. The addition of this non-local metasurface to a conventional microscope enables high-precision quantitative phase contrast imaging.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Zhiyu Tan, Fei Fan, Shengnan Guan, Hao Wang, Dan Zhao, Yunyun Ji, Shengjiang Chang
Summary: This work introduces the gyrotropic semiconductor InSb into a twisted bilayer metasurface to form a magneto-optical moire metasurface. Through theoretical analysis, it is found that a specific moire angle can simultaneously break time-reversal symmetry and spatial mirror symmetry, resulting in nonreciprocity and chirality with spin-conjugate asymmetric transmission. The experiments confirm the active manipulation of chirality through the rotation of the twisted angle and external magnetic field, achieving spin-conjugate asymmetric transmission.
Article
Physics, Applied
Gensen Yang, Fei Zhang, Mingbo Pu, Xiong Li, Xiaoliang Ma, Yinghui Guo, Xiangang Luo
Summary: This paper presents the design of dual-wavelength multilevel diffractive lenses, which can effectively improve the imaging capabilities of optical systems. The results suggest good focusing performance at two wavelengths, providing new opportunities for various applications in dual-wavelength imaging systems and lightweight collimators.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Polymer Science
Xin Liu, Min Li, Bincheng Li, Bin Fan
Summary: This paper proposes a method for fabricating a high-optical quality and high-thermal stability M-FDL, and demonstrates its effectiveness through experiments. The M-FDL obtained by this method has small wave-front error, high diffraction efficiency, excellent thermal stability, and lightweight characteristics.
Article
Physics, Applied
Katerina Stojanoska, Chen Shen
Summary: This work proposes a non-Hermitian planar elastic metasurface that achieves unidirectional focusing of flexural waves by introducing tunable material loss and adjusting the reflected phase. Experimental results demonstrate that the metasurface can focus the incident wave energy from one direction and achieve zero reflection in the other direction.
APPLIED PHYSICS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Figen S. Oktem, Oguzhan Fatih Kar, Can Deniz Bezek, Farzad Kamalabadi
Summary: This paper introduces a novel multi-spectral imaging technique that overcomes the spatial and spectral resolution limitations of traditional spectral imaging methods by utilizing diffractive lenses to achieve higher resolution in computational imaging.
IEEE TRANSACTIONS ON COMPUTATIONAL IMAGING
(2021)
Article
Nanoscience & Nanotechnology
Rajesh Menon, Nicole Brimhall
Summary: Flat optics, which have been used for focusing and imaging for many years, have experienced a recent resurgence due to advancements in computational electromagnetics and nanofabrication. In this perspective, the connections between flat lenses and holograms are summarized, the current state of diffractive flat lenses is described, an effective metric for comparing their performance is proposed (the generalized strehl ratio), and potential areas for future research are explored.
Article
Optics
Necati Kaya, Gamze Kaya, James Strohaber, Junfeng Zhou, Alexandre A. Kolomenskii, Hans A. Schuessler
Summary: Diffractive lenses can achieve multifocal focusing, with the ability to adjust focal distances and energy densities by changing grating parameters. Existing design methods cannot provide real-time control over focal point positions and energy distribution.
OPTICAL ENGINEERING
(2021)
Article
Physics, Multidisciplinary
Davide Rocco, Attilio Zilli, Antonio Ferraro, Adrien Borne, Vincent Vinel, Giuseppe Leo, Aristide Lemaitre, Carlo Zucchetti, Michele Celebrano, Roberto Caputo, Costantino De Angelis, Marco Finazzi
Summary: We experimentally demonstrate the ability to modulate the second harmonic power emitted by nonlinear AlGaAs metasurfaces embedded in a liquid crystal matrix by changing the relative in-plane orientation between the liquid crystal director and the linear polarization of the excitation light. Numerical simulations show that this modulation is achieved by efficiently radiating the second harmonic through resonant excitation of electric or magnetic dipole field distributions inside each meta-atom. The resonant behavior depends on the geometric parameters, crystallographic orientation, and anisotropy of the metasurface, which can be optimized to modulate the emitted second harmonic power by approximately one order of magnitude.
NEW JOURNAL OF PHYSICS
(2022)
Article
Optics
Ran Ning, Dayong Wang, Lu Rong, Jie Zhao, Yunxin Wang, Shufeng Lin
Summary: This Letter proposes a binary diffractive lens for a scanning imaging system working at 278.6 GHz, which generates a converging beam with a waist diameter of 0.65 mm and achieves a lateral imaging resolution of 1 mm. This low-cost terahertz lens, constituted by concentric rings with different radii, is optimized by stimulated annealing algorithm and fabricated by three-dimensional printing. Compared with the conventional transmissive convex lens, it achieves higher resolution and enhanced imaging quality through a smaller focal spot of the illumination beam. This type of lens would promote terahertz imaging closer to practical applications such as nondestructive testing and other scenarios.
CHINESE OPTICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Sophie Fisher, Charles Roques-Carmes, Nicholas Rivera, Liang Jie Wong, Ido Kaminer, Marin Soljacic
Article
Optics
Mihika Prabhu, Charles Roques-Carmes, Yichen Shen, Nicholas Harris, Li Jing, Jacques Carolan, Ryan Hamerly, Tom Baehr-Jones, Michael Hochberg, Vladimir Ceperic, John D. Joannopoulos, Dirk R. Englund, Marin Soljacic
Article
Optics
Rasmus E. Christiansen, Zin Lin, Charles Roques-Carmes, Yannick Salamin, Steven E. Kooi, John D. Joannopoulos, Marin Soljacic, Steven G. Johnson
Article
Nanoscience & Nanotechnology
Zin Lin, Charles Roques-Carmes, Raphael Pestourie, Marin Soljacic, Arka Majumdar, Steven G. Johnson
Summary: By codesigning a metaoptical front end with an image-processing back end, we are able to achieve superior noise sensitivity and compactness compared to optics-only or computation-only approaches. This method is demonstrated through examples of subwavelength imaging and reconstruction of multiple light sources' full polarization coherence matrices. Incorporating full wave physics in the design process is crucial for detecting discarded spectral and polarization information.
Article
Physics, Applied
M. S. Sidorenko, O. N. Sergaeva, Z. F. Sadrieva, C. Roques-Carmes, P. S. Muraev, D. N. Maksimov, A. A. Bogdanov
Summary: The study reports the first experimental observation of an accidental electromagnetic bound state in the continuum (BIC) in a one-dimensional periodic chain of coaxial ceramic disks, which is a general wave phenomenon appearing in acoustic, hydrodynamic, and photonic systems of various dimensionalities. The accidental BIC manifests as a narrow peak in the transmission spectra of the chain, with the radiative quality factor of BICs linearly increasing with the number of disks. When radiation losses become negligible, the chain can be considered practically infinite.
PHYSICAL REVIEW APPLIED
(2021)
Article
Nanoscience & Nanotechnology
Charles Roques-Carmes, Zin Lin, Rasmus E. Christiansen, Yannick Salamin, Steven E. Kooi, John D. Joannopoulos, Steven G. Johnson, Marin Soljacic
Summary: Optical metasurfaces have the potential to integrate multiple functionalities in a compact form-factor. We propose a framework for the inverse design of multilayer metaoptics via topology optimization, demonstrating high-efficiency multifunctionality in multiangle light concentration and plan-achromaticity. Our approach has been experimentally validated with a 3D-printed light concentrator working at five different nonparaxial angles of incidence.
Article
Optics
Zin Lin, Raphael Pestourie, Charles Roques-Carmes, Zhaoyi Li, Federico Capasso, Marin Soljacic, Steven G. Johnson
Summary: We introduce end-to-end inverse design for multi-channel imaging, which involves optimizing a nanophotonic frontend and an image-processing backend to extract depth, spectral, and polarization channels from a single monochrome image. We demonstrate that subwavelength-scale metasurface designs can easily distinguish similar wavelength and polarization inputs, unlike diffractive optics. Our proposed technique combines a single-layer metasurface frontend with an efficient Tikhonov reconstruction backend, requiring only a grayscale sensor. Through spontaneous demultiplexing, our method achieves multi-channel imaging by separating different channels into distinct spatial domains on the sensor. We present large-area metasurface designs for multi-spectral imaging, depth-spectral imaging, and all-in-one spectro-polarimetric-depth imaging, demonstrating robust reconstruction performance.
Article
Multidisciplinary Sciences
Charles Roques-Carmes, Nicholas Rivera, Ali Ghorashi, Steven E. Kooi, Yi Yang, Zin Lin, Justin Beroz, Aviram Massuda, Jamison Sloan, Nicolas Romeo, Yang Yu, John D. Joannopoulos, Ido Kaminer, Steven G. Johnson, Marin Soljacic
Summary: Research focuses on the application of scintillation and improving the brightness, speed, and controllability of light-emitting materials; a unified theory of nanophotonic scintillators is developed, and nanophotonic structures are integrated into scintillators to enhance the performance of light emission.
Article
Nanoscience & Nanotechnology
Jaewon Oh, Kangmei Li, Jun Yang, Wei Ting Chen, Ming-Jun Li, Paulo Dainese, Federico Capasso
Summary: This study introduces a mode-division multiplexer and demultiplexer design based on a metasurface cavity, which can perform mode conversion and coupling to fibers on a single surface without the need for additional optics. The converted modes have high fidelity due to the optimized phase profile of the metasurface.
Article
Multidisciplinary Sciences
Yi Yang, Charles Roques-Carmes, Steven E. Kooi, Haoning Tang, Justin Beroz, Eric Mazur, Ido Kaminer, John D. Joannopoulos, Marin Soljacic
Summary: Flatbands are crucial in condensed-matter physics and photonics. Although they have never been shown to affect the core interaction between free electrons and photons, we have theoretically revealed that photonic flatbands can boost their interaction by designing flatband resonances in a silicon-on-insulator photonic crystal slab. Our results support the use of flatbands as test beds for strong light-electron interaction.
Article
Materials Science, Multidisciplinary
Avner Shultzman, Ohad Segal, Yaniv Kurman, Charles Roques-Carmes, Ido Kaminer
Summary: Converting ionizing radiation into visible light is important for various technologies, including high-energy particle detectors and X-ray imaging. However, there is a trade-off between efficiency and resolution in imaging applications due to the nature of spontaneous emission. This study proposes the concept of inverse-designed nanophotonic scintillators to overcome this trade-off and demonstrates a threefold improvement in both resolution and efficiency using multilayer phosphor nanostructures.
ADVANCED OPTICAL MATERIALS
(2023)
Review
Physics, Applied
Charles Roques-Carmes, Steven E. Kooi, Yi Yang, Nicholas Rivera, Phillip D. Keathley, John D. Joannopoulos, Steven G. Johnson, Ido Kaminer, Karl K. Berggren, Marin Soljacic
Summary: When free electrons impinge on optical structures or pass nearby, they emit electromagnetic radiation called cathodoluminescence. These effects have been extensively studied in high-energy physics, but recent progress in nanophotonics has led to new applications in shaping and controlling free-electron radiation. In this review, we present a unified framework for understanding free-electron light-matter interaction and discuss experimental techniques for characterizing and controlling free-electron radiation in nanophotonic systems. We also outline future directions for this field, including ultrafast and quantum effects, tunable short-wavelength emitters, and free-electron radiation from topological states.
APPLIED PHYSICS REVIEWS
(2023)
Article
Multidisciplinary Sciences
Charles Roques-Carmes, Yannick Salamin, Jamison Sloan, Seou Choi, Gustavo Velez, Ethan Koskas, Nicholas Rivera, Steven E. Kooi, John D. Joannopoulos, Marin Soljacic
Proceedings Paper
Engineering, Electrical & Electronic
Charles Roques-Carmes, Nicholas Rivera, Ali Ghorashi, Steven E. Kooi, Yi Yang, Zin Lin, Justin Beroz, John D. Joannopoulos, Ido Kaminer, Steven Johnson, Marin Soljacic
Summary: This study introduces a general framework for describing the non-equilibrium radiation by materials in nanophotonic structures, and demonstrates the concept experimentally by enhancing and shaping cathodoluminescence in a silica photonic crystal.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Yannick Salamin, Charles Roques-Carmes, Zin Lin, Steven G. Johnson, Marin Soljacic
Summary: This method presents a way to overcome the Manley-Rowe limit in a Q-factor engineered multimodal nonlinear cavity, enabling continuous-wave terahertz generation with a theoretical conversion efficiency of 98.8%.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)