Article
Chemistry, Multidisciplinary
Weibin Feng, Jianchao Zhang, Qinfei Wu, Augusto Martins, Qian Sun, Zhihao Liu, Yong Long, Emiliano R. Martins, Juntao Li, Haowen Liang
Summary: Chromatic aberration is a challenge for metalenses, but multiwavelength achromatic metalenses can overcome limitations and extend applications. A 1 mm diameter red-green-blue achromatic metalens doublet with a designed NA of 0.8 was successfully applied in a digital imaging system, showcasing its potential.
Article
Optics
Bumin K. Yildirim, Hamza Kurt, Mirbek Turduev
Summary: The study introduces a high-numerical aperture, diffraction-limited achromatic multilevel diffractive lens designed and optimized using a multi-objective differential evolution algorithm, with experimental validation through 3D printing technology.
PHOTONICS RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Lijuan Zhang, Chengmiao Wang, Yupei Wei, Yu Lin, Yeming Han, Yongbo Deng
Summary: The focal efficiency of the achromatic metalens can be effectively improved by using the topology optimization design method.
Article
Materials Science, Multidisciplinary
Feilou Wang, Shiqiang Zhao, Yongzheng Wen, Jingbo Sun, Ji Zhou
Summary: In this work, a deep learning model is developed to design achromatic metalenses based on the geometric phase theory, which have both color correction and high focusing efficiency. The design takes into account converted transmission coefficients including both phase and amplitude to ensure achromatic focusing and high focusing efficiency. Numerical simulations in the visible wavelengths show that the designed metalenses have a focal length of 266 μm with deviation under 5% and an average focusing efficiency of 52%.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Tie Hu, Xing Feng, Yunxuan Wei, Shengqi Wang, Yuhong Wei, Zhenyu Yang, Ming Zhao
Summary: Zoom metalens doublets offer compactness, strong zoom capability, and compatibility with CMOS, surpassing the advantages of traditional refractive zoom lenses. However, the issue of chromatic aberration limits their potential in broadband systems. In this study, we globally optimized the phase profiles in the visible range and successfully demonstrated a moire lens-based zoom metalens doublet that can work achromatically in the 440-640 nm band. This doublet achieves a continuous zoom range from 1x to 10x, while maintaining high focusing efficiency up to 86.5% and polarization insensitivity.
Article
Optics
Wei Cheng, Junbo Feng, Yan Wang, Zheng Peng, Shengyin Zang, Hao Cheng, Xiaodong Ren, Yubei Shuai, Hao Liu, Jiagui Wu, Junbo Yang
Summary: Chromatic aberration is a significant phenomenon that affects image quality in optical systems. In this study, we propose a broadband achromatic polarization-insensitive metalens using a genetic algorithm to optimize the geometric parameters.
Article
Optics
Ziheng Qian, Shengnan Tian, Wei Zhou, Junwei Wang, Hanming Guo, Songlin Zhuang
Summary: In this study, an all-dielectric polarization-modulated broadband achromatic bifunctional metalens (BABM) is proposed, which achieves bifunctional self-compensation by applying two independent phases on the metalens. The BABM has advantages of being flexible, single-layer, convenient in manufacturing, and optical path miniaturization friendly, and will open a new page in advanced integrated optical systems.
Article
Materials Science, Multidisciplinary
Yechuan Zhu, Guangmin Yuan, Ying Chang, Shun Zhou, Chunfang Wu, Yao Li, Weiguo Liu
Summary: Metalenses with different cross sections of silicon nitride pillars can achieve diffraction-limited achromatic focusing for the ultra-broad bandwidth from 400 to 1120 nm, with focal spots at different wavelengths in almost the same position. The maximum focal shift is less than 3% and the average transmittance and focusing efficiency are 90.2% and 77.7% respectively. These results indicate significant improvement over previously reported achromatic metalenses and provide a means to develop high-quality achromatic metalenses for the entire visible and near-infrared spectrum.
RESULTS IN PHYSICS
(2023)
Article
Optics
Jin Chen, Hongchen Chu, Yun Lai, Huanyang Chen, Weili Song, Mingji Chen, Daining Fang
Summary: In this paper, a semi-circular gradient index lens (sGRIN) with a modified refractive index profile is proposed, achieving highly efficient achromatic subdiffraction focusing and broadband diffraction-limited far-field radiation.
PHOTONICS RESEARCH
(2021)
Article
Optics
Xinjian Lu, Yinghui Guo, Mingbo Pu, Yaxin Zhang, Zhu Li, Xiong Li, Xiaoliang Ma, Xiangang Luo
Summary: In this article, a single-layer broadband achromatic metasurface was proposed to achieve sub-diffraction focusing in the visible range. It is capable of generating sub-diffraction focal spots under left-handed circularly polarized incident light with arbitrary wavelength at the same focal plane, showing promising potentials in various applications.
Article
Nanoscience & Nanotechnology
Xiaoluo He, Chu Qi, Sheng Lei, Alex M. H. Wong
Summary: In this work, a dual-polarized, broadband and high NA achromatic metalens based on the Huygens' metasurface is proposed. The metalens achieves diffraction-limited focusing with 2% maximum focal length deviation and 70% average focusing efficiency over a bandwidth of 16.7%. It opens wide-ranging opportunities for microwave and mm-wave imaging and communication applications.
Article
Optics
Wule Zhu, Fang Duan, Kazuya Tatsumi, Anthony Beaucamp
Summary: This study proposes an unconventional monolithic honeycomb-like lens concept with topological degrees of design freedom, capable of achieving diffraction-limited achromatic performance. The honeycomb lens outperforms traditional aspheric lenses and commercial cascaded lenses in terms of full field of view performance. This topological honeycomb lens concept may offer inexpensive and compact achromatic optics for various applications such as consumer cameras, wearable optics, and virtual reality.
Article
Chemistry, Multidisciplinary
Ruixue Shi, Shuling Hu, Chuanqi Sun, Bin Wang, Qingzhong Cai
Summary: This paper proposes a polarization-insensitive achromatic metalens operating over a continuous bandwidth in the visible light spectrum. The metalens is designed with interleaved silicon nitride nanopillars and optimized phase compensation using the Fresnel zone spatial multiplexing method and the particle swarm algorithm. It achieves high focusing efficiency and broadband achromatization with a simple design, suitable for applications in microscopic imaging, cameras, and other fields.
Article
Multidisciplinary Sciences
Corey A. Richards, Christian R. Ocier, Dajie Xie, Haibo Gao, Taylor Robertson, Lynford L. Goddard, Rasmus E. Christiansen, David G. Cahill, Paul V. Braun
Summary: In this study, the authors used subsurface 3D printing to fabricate compact and high-performance achromatic imaging micro-optics. These micro-optics, which integrate refractive and diffractive elements, demonstrate high focusing efficiencies, high numerical apertures, and low chromatic focusing errors, offering a promising pathway towards achromatic micro-optical systems.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Lingcong Luo, Zhengyang Wang, Juntao Li, Haowen Liang
Summary: Various solutions for augmented reality (AR) head-mounted displays have been proposed, but traditional optic designs face problems of volume and limited field of view. Metalenses have shown potential for AR eyepiece applications due to their phase control ability and advantages in portability and integration. A single-layer trans-reflective RGB-achromatic metalens with a large field of view has been designed, which reflects oblique incident virtual images while maintaining balanced transparency to real-world light.
Article
Chemistry, Multidisciplinary
Won-Geun Kim, Jong-Min Lee, Younghwan Yang, Hongyoon Kim, Vasanthan Devaraj, Minjun Kim, Hyuk Jeong, Eun-Jung Choi, Jihyuk Yang, Yudong Jang, Trevon Badloe, Donghan Lee, Junsuk Rho, Ji Tae Kim, Jin-Woo Oh
Summary: Plasmonic nanoparticle clusters offer unique electromagnetic responses at optical frequencies and can be used for nanophotonic applications. This study presents a novel strategy for fabricating three-dimensional nanoparticle clusters with efficient coupling between gold nanoparticles and other nanomaterials. Quantum dots embedded in the clusters exhibit a blue shift in emission spectrum. In addition, an ultracompact diagnostic platform is demonstrated for detecting viruses and mutations.
Article
Materials Science, Multidisciplinary
Muhammad Ashar Naveed, Joohoon Kim, Isma Javed, Muhammad Afnan Ansari, Junhwa Seong, Yehia Massoud, Trevon Badloe, Inki Kim, Kashif Riaz, Muhammad Zubair, Muhammad Qasim Mehmood, Junsuk Rho
Summary: This study presents a simple asymmetric spin-orbit interaction (SOI)-based technique for multifunctional metaoptics. It uses a single unit cell and relies on geometric phase, reducing fabrication challenges and computational costs. A new low-cost material is used to optimize the transmission efficiency. The integrated system, which includes off-axis holographic metasurfaces and pressure-sensitive liquid crystal cells, allows for actively tunable metaholography without limitations on center symmetric information encoding. The design, fabrication, and interactive capabilities make this setup a potential candidate for various applications.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Trevon Badloe, Joohoon Kim, Inki Kim, Won-Sik Kim, Wook Sung Kim, Young-Ki Kim, Junsuk Rho
Summary: The nanostructured metasurfaces provide a platform for high-performance color printing, active multicolor cryptographic applications, and tunable pixels towards high-performance full-color reflective displays.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Younghwan Yang, Hongyoon Kim, Trevon Badloe, Junsuk Rho
Summary: Tunable metasurfaces have the potential to replace bulky active optical modules and enable practical flat optical devices. This study presents liquid crystal integrated chiral metasurfaces that can continuously adjust the intensity of metaholograms. The proposed LC integrated spin-selective chiral metasurface provides a new resource for the development of compact active optical modules with continuously tunable intensity.
Article
Nanoscience & Nanotechnology
Muhammad Ashar Naveed, Joohoon Kim, Muhammad Afnan Ansari, Inki Kim, Yehia Massoud, Jaekyung Kim, Dong Kyo Oh, Trevon Badloe, Jihae Lee, Yeseul Kim, Dongmin Jeon, Jonghyun Choi, Muhammad Zubair, Muhammad Qasim Mehmood, Junsuk Rho
Summary: In this study, we propose a broad-band polarization-insensitive flexible metasurface for secure packaging and transportation of sensitive test tubes. The high-index TiO2 nanoparticle-embedded-resin structures are fabricated using UV nanoimprint lithography, enabling rapid fabrication and replication of the flexible metasurface. The results demonstrate high transmission efficiency of the metasurface in the visible domain, making it suitable for applications in bendable displays, wearable devices, and holographic labeling.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Optics
Joohoon Kim, Dong Kyo Oh, Hongyoon Kim, Gwanho Yoon, Chunghwan Jung, Jaekyung Kim, Trevon Badloe, Hyunjung Kang, Seokwoo Kim, Younghwan Yang, Jihae Lee, Byoungsu Ko, Jong G. Ok, Junsuk Rho
Summary: This study demonstrates a high-efficiency hologram fabrication method using nanomanufacturing techniques, showing record high theoretical efficiency at a single wavelength and high efficiency over a broad wavelength range. The method offers high throughput and low cost, which could accelerate the practical application of metasurface holography.
LASER & PHOTONICS REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Sunae So, Joohoon Kim, Trevon Badloe, Chihun Lee, Younghwan Yang, Hyunjung Kang, Junsuk Rho
Summary: Metasurface-generated holography is a promising method for reproducing vivid scenes by manipulating light's optical properties using compact devices. However, achieving multiple holographic images with a single metasurface is difficult due to capacity limitations. This study presents an inverse design method using gradient-descent optimization to encode multiple holographic information into a single metasurface. By exploiting this method, multiplane RGB color holograms and 3D holograms are designed and experimentally demonstrated. The research findings demonstrate the high-density holography achievable with a single metasurface, providing a route for practical metasurface-generated holography.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Nasir Mahmood, Joohoon Kim, Muhammad Ashar Naveed, Yeseul Kim, Junhwa Seong, Seokwoo Kim, Trevon Badloe, Muhammad Zubair, Muhammad Qasim Mehmood, Yehia Massoud, Junsuk Rho
Summary: Recent advancements in technology have allowed for the manipulation of light's intrinsic properties using Metasurfaces. This study presents a broadband multifunctional Metasurfaces platform that can independently control the phase profile for two orthogonal polarization states of incident light over dual-wavelength spectra.
Article
Chemistry, Multidisciplinary
Byoungsu Ko, Jaekyung Kim, Younghwan Yang, Trevon Badloe, Jeonghoon Park, Joo Hwan Ko, Minsu Jeong, Hyunjung Kang, Chunghwan Jung, Young Min Song, Junsuk Rho
Summary: This study investigates humidity-responsive nano pixels with a 700 nm resolution, demonstrating full standard RGB gamut coverage and a millisecond-response time. The color pixels are designed as Fabry-Perot etalons and consist of an aluminum mirror substrate, humidity-responsive polyvinyl alcohol spacer, and a top layer of disordered silver nanoparticles. The experiment shows that the volume change of the polyvinyl alcohol reaches up to 62.5% when the relative humidity is manipulated from 20 to 90%. The disordered silver nanoparticle layer enhances the speed of absorption and swelling to the millisecond level.
Article
Optics
Joohoon Kim, Wonjoong Kim, Dong Kyo Oh, Hyunjung Kang, Hongyoon Kim, Trevon Badloe, Seokwoo Kim, Chanwoong Park, Hojung Choi, Heon Lee, Junsuk Rho
Summary: This paper introduces a single-step printable platform for UV metasurfaces, which solves the problems of scarcity in low-loss UV materials and manufacturing limitations of high cost and low throughput. A UV-curable resin dispersed with zirconium dioxide (ZrO2) nanoparticles is developed as a printable material, which has a high refractive index and low extinction coefficient in the UV range. By utilizing nanoimprint lithography, UV metasurfaces can be fabricated in a single step. Experimental results demonstrate the feasibility of this method in fabricating UV metaholograms with vivid and clear holographic images. The proposed method enables repeat and rapid manufacturing of UV metasurfaces, bringing them closer to real-life applications.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Editorial Material
Optics
Younghwan Yang, Trevon Badloe, Junsuk Rho
Summary: The article discusses a new process that uses direct laser writing to create vibrant, finely tunable colors on a centimeter scale. This is achieved by using pixelated F-P cavity structures and taking advantage of their fabrication speed and spatial resolution.
ADVANCED PHOTONICS
(2023)
Article
Chemistry, Multidisciplinary
Trevon Badloe, Yeseul Kim, Joohoon Kim, Hyemi Park, Aleksandr Barulin, Yen N. Diep, Hansang Cho, Won-Sik Kim, Young-Ki Kim, Inki Kim, Junsuk Rho
Summary: In this paper, a dual-mode metalens integrated with a liquid crystal cell capable of electrically switching between bright-field and edge-enhanced imaging on the millisecond scale is designed and experimentally realized. The metalens, designed using the concepts of geometric and propagation phase and physically encoded with hydrogenated amorphous silicon, demonstrates the ability to focus and generate vortex under different states of circular polarization, proving its use for biological imaging. This work provides a compact form factor for in vivo observation and monitoring of cell response and drug screening.
Article
Chemistry, Multidisciplinary
Trevon Badloe, Junhwa Seong, Junsuk Rho
Summary: Metalenses have the potential to revolutionize optical devices by integrating multiple functionalities into a single flat device. In this study, we design metalenses that are sensitive to incident spin angular momentum and provide three distinct modes based on the handedness of the light. We experimentally demonstrate the use of these metalenses for spin-selective imaging of visible light and envision their application in chiral bioimaging, optical computing, and computer vision.
Article
Materials Science, Multidisciplinary
Do T. Nga, Anh D. Phan, Vu D. Lam, Trevon Badloe, Junsuk Rho
Summary: We propose a design rule for broadband metamaterial absorbers and investigate their plasmonic properties under solar irradiation. The metamaterials consist of periodic arrays of titanium nitride (TiN) rings placed on an antireflective MgF2 dielectric film on a TiN bottom layer. We found the dependence of the optical spectrum on structural parameters and proposed a simple rule to design nanostructures with high spectral absorptivity. Our study introduces a new approach to design metamaterial perfect absorbers and has potential applications in solar energy harvesting and photo-to-thermal conversion.
OPTICAL MATERIALS EXPRESS
(2023)
Review
Optics
Trevon Badloe, Seokho Lee, Junsuk Rho
Summary: The increasing amount of processed information is driving the demand for new computing systems, and photonic computing is emerging as an attractive alternative due to its high-speed calculations, massive parallelism, and low energy consumption. This review discusses the physical implementation of basic optical calculations using metamaterials, as well as the realization of all-optical artificial neural networks. The article provides an introduction to the mathematical principles behind optical computation methods, and explores the advantages, current problems, and potential future directions in this field.
ADVANCED PHOTONICS
(2022)
