Article
Optics
Haoran Wang, Fan Zhang, Cong Wang, Ji'an Duan
Summary: By designing and fabricating anti-reflective subwavelength structures, the goal of increasing far-infrared transmittance on ZnS substrate was successfully achieved. Through optimizing structural parameters and using specific laser beams, the clarity of infrared images was ultimately improved.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Juan Rombaut, Sofia Martinez, Umberto Maria Matera, Prantik Mazumder, Valerio Pruneri
Summary: The suppression of optical reflection is crucial in many applications, traditionally achieved through multilayer coatings but now also using biomimetic nanostructures. While the latter offers advantages such as superhydrophobicity and self-cleaning effects, they are prone to mechanical failure.
Article
Energy & Fuels
Ashish Prajapati, Jordi Llobet, Patricia C. Sousa, Helder Fonseca, Carlos Calaza, Gil Shalev
Summary: The study focuses on the utilization of deep subwavelength features to decrease broadband and omnidirectional reflection of the solar spectrum, achieving over 80% reflection decrement. Various surface silicon arrays incorporating features such as nanopillar arrays, quasinanolens, and deep subwavelength sidewall scalloping result in significant reductions in reflection, with additional exploration of possible light-trapping mechanisms numerically.
Article
Energy & Fuels
Cristina Leyre Pinto, Jaione Bengoechea, Inaki Cornago, Eugenia Zugasti
Summary: Front glass structured with random subwavelength structures provides photovoltaic modules with a spectrally broadband omnidirectional antireflective property, enhancing also the incident angle modifier factor and boosting energy production in the field. Long-term outdoor monitoring of PV devices laminated with nanostructured glasses shows that the short-circuit current improvement ranges from 3.0% in September to 4.0% in December. The investigation of the solar angle of incidence influence indicates that the Isc performance increases more than 5.0% with AOI higher than 60°.
Article
Materials Science, Ceramics
Jian Yong Huang, Yu Wang, Guang Tao Fei, Shao Hui Xu, Zhi Zeng, Biao Wang
Summary: A TiO2/ZnO double-layer coating with wider band antireflection and down-shifting performance was prepared to reduce light reflection and minimize spectral mismatch in solar cells. The optimal refractive index and thickness of the coatings were obtained through computational simulations. The TiO2/ZnO coating reduced the reflectivity of the silicon substrate by 24.97% in the 400-1100 nm band, and the ZnO nanoparticles converted light at approximately 345 nm-527 nm, improving the photocurrent of solar cells. These findings highlight the potential of TiO2/ZnO coatings in the development of multifunctional coatings for enhancing solar cell efficiency.
CERAMICS INTERNATIONAL
(2023)
Article
Energy & Fuels
Daxue Du, Zhaopeng Xu, Linna Wang, Yikai Guo, Shan Liu, Tengteng Yu, Chenbo Wang, Fengyan Wang, Haiyan Wang
Summary: Different shaped nanostructures were simulated at omnidirectional angles, with moth-eye nanostructured perovskite solar cells showing the best performance under omnidirectional incidence. The antireflection effect of curved structures becomes increasingly important as the incident angle increases, offering potential theoretical guidance for optimization of antireflection structures for solar cells.
Article
Optics
Miguel Barona-Ruiz, Carlos Perez-Armenta, Alejandro Ortega-Monux, Gonzalo Wanguemert-Perez, Inigo Molina-Fernandez, Pavel Cheben, Robert Halir
Summary: A broadband, low loss, and high extinction ratio TM-pass polarizer has been designed and implemented on the Silicon-on-Insulator platform. The polarizer utilizes a subwavelength metamaterial to engineer a Bragg grating that reflects the fundamental TE mode into the first order TE mode while allowing the TM mode to pass. Through 3D-FDTD simulations, our device achieves an extinction ratio exceeding 20 dB, insertion losses below 0.5 dB, and back-reflections of the fundamental TE mode of approximately -20 dB in a bandwidth of 150 nm.
Article
Energy & Fuels
Cristina L. Pinto, Inaki Cornago, Alicia Buceta, Eugenia Zugasti, Jaione Bengoechea
Summary: Glass samples were processed using a single-step self-masking RIE process to create random subwavelength structures (SWSs), which mimic natural anti-reflective and anti-soiling patterns. These SWSs on glass exhibit excellent broadband omnidirectional anti-reflective (AR) properties and enhance the surface roughness, improving wettability and anti-soiling performance. The performance improvement of photovoltaic devices using these structured glasses as front cover was evaluated.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Energy & Fuels
Erik Zall, Mikael Jarn, Stefan Karlsson, Henrik Tryggeson, Mikko Tuominen, Mikael Sundin, Thomas Wagberg
Summary: This paper describes the development of antireflective mesoporous silica coatings on low-iron float glass using the aerosol-based nFOGTM deposition technique. The experimental results show that these coatings have the optimal thickness and improved antireflection effect, making them suitable for solar glass applications.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Optics
Jingyuan Zhu, Yi Ning, Lingyun Xie, Siyu Dong, Xinbin Cheng, Zhanshan Wang, Yifang Chen
Summary: Diffractive optical elements (DOEs) are essential in modern optical applications, but it is challenging to balance diffraction efficiency and working bandwidth. This study demonstrates broadband DOEs using multilayer subwavelength structures, allowing for greater control over phase and phase dispersion. An infrared design achieved an average efficiency of over 70% in a three-octave bandwidth. This work has significant value for broadband optical systems with DOEs, such as spectral imaging and augmented reality.
Article
Chemistry, Physical
Jiahao Wu, Jeilei Tu, Lei Li, Xiangjiang Xiao, Kai Hu, Shouzhe Yu, Yucen Xie, Yanyun Yang, Hao Wu
Summary: Gradient refractive index-based broadband antireflective coatings prepared using refractive index tunable hybrid SiO2 sols showed excellent performance in enhancing transmittance, hardness, and durability of glass substrates.
SURFACES AND INTERFACES
(2022)
Article
Energy & Fuels
Cristina L. Pinto, Inaki Cornago, Alicia Buceta, Eugenia Zugasti, Jaione Bengoechea
Summary: Randomly distributed subwavelength structures (SWSs) with excellent broadband anti-reflective properties were fabricated using self-masking reactive ion etching (RIE) process. The optical and topological characteristics of these structures were characterized using a spectrophotometer and a scanning electron microscope (SEM). The influence of topological parameters on the anti-reflective response was analyzed through modeling and simulation, and the best SWS was selected based on its omnidirectional behavior.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Optics
Lei Qi, Yali Liu, Hao Jing, Xiaomin Yang, Rongzhu Zhang
Summary: Theoretical model of temperature and stress damage of a triple-junction GaAs solar cell with a conical subwavelength structure antireflection film is proposed, showing that the subwavelength structure significantly modulates the light field, temperature field, and stress field inside the solar cell. The simultaneous influence of reflectivity and conical structure modulation leads to minimum melting damage and stress damage thresholds under specific cone height and bottom diameter parameters.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Qi Wang, Rui Li, Xufeng Gao, Shuhua Cao, Chunxian Tao, Ruijin Hong, Dawei Zhang
Summary: This study introduces a broadband reflector made of double-layer subwavelength gratings, achieving high reflectance over a wide spectral range. By utilizing guided mode resonance and high refractive index contrast properties, it demonstrates good angular tolerance at specific wavelengths, which can benefit the monolithic integration of optoelectronic devices.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Chemistry, Physical
Hui Cong, Xinbo Chu, Fengshuo Wan, Zema Chu, Xiaoyu Wang, Yao Ma, Jizhong Jiang, Liang Shen, Jingbi You, Chunlai Xue
Summary: A high-performance broadband photodetector using inorganic CsPbBr3/GeSn heterojunction has been demonstrated, showing high responsivity and stability. It has great potential for various applications in the field of photodetection.
Article
Chemistry, Multidisciplinary
Jung Woo Leem, Hee-Jae Jeon, Yuhyun Ji, Sang Mok Park, Yunsang Kwak, Jongwoo Park, Kee-Young Kim, Seong-Wan Kim, Young L. Kim
Summary: Counterfeit medicines pose a threat to patient safety and public health, as well as causing economic losses. A new edible code using silk fibroin genetically encoded with fluorescent proteins is introduced, which can be read by smartphones. This code can serve as a dosage-level anticounterfeit measure and authentication feature, empowering patients to combat illicit pharmaceuticals.
ACS CENTRAL SCIENCE
(2022)
Article
Multidisciplinary Sciences
Woohyun Park, Van Phuc Nguyen, Yale Jeon, Bongjoong Kim, Yanxiu Li, Jonghun Yi, Hyungjun Kim, Jung Woo Leem, Young L. Kim, Dong Rip Kim, Yannis M. Paulus, Chi Hwan Lee
Summary: This article introduces a unique platform for ocular drug delivery, which integrates silicon nanoneedles with tear-soluble contact lenses. The platform enables painless and long-term sustained delivery of ocular drugs, and has shown effectiveness in treating chronic ocular diseases.
Article
Nanoscience & Nanotechnology
Yong-Guen Yu, Joo Hwan Ko, Jong Hyun An, Beom-Goo Kang, Young Min Song, Jae-Suk Lee
Summary: A facile approach for improving color purity is explored by introducing an angle-robust selective absorber (ARSA) into bottlebrush block copolymer (BBCP)-based one-dimensional (1D) photonic crystals (PCs). The synthesis of BBCPs with ultrahigh molecular weights and low dispersities allows for the fabrication of 1D PCs with different periodicities, resulting in full color-generation. Optical simulation and experimental results verify the enhancement of color saturation, even at various incident angles.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Joo Hwan Ko, So Hee Kim, Min Seok Kim, Se-Yeon Heo, Young Jin Yoo, Yeong Jae Kim, Heon Lee, Young Min Song
Summary: This study proposes a strategy based on a hybrid disordered photonic structure to achieve multifaceted light harvesting using a scalable fabrication method. By incorporating nanostructures in the active area and microstructures in the inactive edge area, the energy conversion efficiency of photovoltaic systems is significantly improved.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Jiwon Kang, Young Jin Yoo, Joo Hwan Ko, Abdullah Al Mahmud, Young Min Song
Summary: In the past few decades, advancements in nanophotonic structures have provided new opportunities for biosensing applications. This study introduces a simple and effective colorimetric biosensing approach using a trilayered GT resonator, which enables the detection of low refractive index bioparticles by producing distinct color differences. Compared to conventional GT resonators, the trilayered design achieves optimal configurations for low refractive index sensitivity, resulting in improved sensing performance.
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
Multidisciplinary Sciences
Won Bae Han, Se-Yeon Heo, Donghak Kim, Seung Min Yang, Gwan-Jin Ko, Gil Ju Lee, Dong-Je Kim, Kaveti Rajaram, Joong Hoon Lee, Jeong-Woong Shin, Tae-Min Jang, Sungkeun Han, Heeseok Kang, Jun Hyeon Lim, Do Hyeon Kim, Soo Hyun Kim, Young Min Song, Suk-Won Hwang
Summary: Recent advances in passive radiative cooling systems have proposed various strategies to improve cooling efficiency. By integrating this technology with the use of biodegradable materials and a bioinspired design, sustainable energy generation can be achieved, benefiting the planet's temperature/climate system. In this study, stretchable and ecoresorbable radiative cooling/heating systems with zebra stripe-like patterns were developed, allowing the generation of a large temperature gradient for thermo-electric generation. The use of zebra print for selective radiative heating showed a significant temperature difference compared to radiative cooling alone, enabling the production of energy through resorbable silicon-based thermoelectric devices. These findings suggest the potential of scalable, eco-friendly renewable energy systems.
Article
Robotics
Minsung Kim, Sehui Chang, Minsu Kim, Ji-Eun Yeo, Min Seok Kim, Gil Ju Lee, Dae-Hyeong Kim, Young Min Song
Summary: With the rise of mobile robotics, developing artificial vision for high-contrast and high-acuity imaging in vertically uneven illumination conditions has become crucial. Inspired by the cuttlefish eye, researchers have created an artificial vision system with a W-shaped pupil, a single ball lens, a flexible polarizer, and a cylindrical silicon photodiode array. This system allows for balancing uneven illumination and achieving high-contrast and high-acuity imaging.
Article
Nanoscience & Nanotechnology
Youngmin Song, Jong Yu Song, Jae-Eul Shim, Dong Hyung Kim, Hee-Kyung Na, Eun-Ah You, Young-Geun Ha
Summary: This paper presents a highly effective and efficient electrode passivation method using a self-assembled multilayer (SAML) to achieve operational stability of electrolyte-gated transistor (EGT) biosensors. The SAML-passivated EGT biosensor works stably in phosphate-buffered saline (PBS) and exhibits ultrasensitive, quantitative, and reliable detection of Tau protein.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Han Hee Jung, Jeongdae Ha, Jeongrak Park, Seongtak Kang, Jinmo Kim, Han Na Jung, Samhwan Kim, Junwoo Yea, Hyeokjun Lee, Saehyuck Oh, Janghwan Jekal, Soojeong Song, Jieun Son, Tae Sang Yu, Youngjeon Lee, Jinyoung Won, Kyung Seob Lim, Yoon Kyeung Lee, Hohyun Keum, Taeyoon Lee, Young Min Song, Jae-Woong Jeong, Jong-Cheol Rah, Ji-Woong Choi, Sheng Xu, Yong-Seok Oh, Kyung-In Jang
Summary: This study proposes a multi-deformable double-sided dopamine-sensing probe with a three-electrode system for reliable real-time monitoring of dopamine dynamics. The probe achieves high sensitivity and selectivity through enzyme immobilization on 3D nanostructures on the working electrode. Experimental and computational analysis demonstrate the probe's ability to withstand deformation and successfully implant into rodent brains for real-time monitoring.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yun-Jo Lee, Jae Seon Yu, Young-Seok Kim, Young Min Song, Sun-Kyung Kim
Summary: We propose a photonic strategy for multidimensional structural coloration that responds to varying illumination conditions. Both theoretical and experimental results verified that the combination of a metal/dielectric/metal cavity with a one-dimensional (1D) metal grating can increase the degree of freedom of structural coloration. The distribution of electric field intensity obtained using rigorous coupled-wave analysis simulation identified multiple photonic bands in the p-polarization as various SPP-mediated hybrid modes.
CURRENT APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Jiwon Kang, Young Jin Yoo, Jin-Hwi Park, Joo Hwan Ko, Seungtaek Kim, Stefan G. Stanciu, Harald A. Stenmark, Jinah Lee, Abdullah Al Mahmud, Hae-Gon Jeon, Young Min Song
Summary: In this study, a novel biosensing approach called DeepGT is proposed, which combines deep learning algorithms with photonic resonators to enhance the accuracy of nanoscale bioparticle counting. This approach shows promise for early screening and triage of emerging viruses within the clinical spectrum of infection.
Article
Multidisciplinary Sciences
Jaejin Park, Kyubeen Kim, Yujin Kim, Tae Soo Kim, In Sik Min, Bowen Li, Young Uk Cho, Chanwoo Lee, Ju Young Lee, Yuyan Gao, Kyowon Kang, Do Hyeon Kim, Won Jun Choi, Hyun-Beom Shin, Ho Kwan Kang, Young Min Song, Huanyu Cheng, Il-Joo Cho, Ki Jun Yu
Summary: This study presents a wireless, solar-powered, flexible optoelectronic device for neuromodulation in freely moving animals. The device uses high-efficiency, thin photovoltaics to harvest energy from various light sources and powers a Bluetooth system for long-term, on-demand use. The device demonstrated notable capabilities and showed potential for space-free neuromodulating applications.
Review
Biophysics
Stefan G. Stanciu, Karsten Koenig, Young Min Song, Lior Wolf, Costas A. Charitidis, Paolo Bianchini, Martin Goetz
Summary: According to the World Health Organization, the percentage of the world's elderly population will double by 2050, leading to an increase in age-related diseases and putting tremendous pressure on global healthcare systems. Therefore, finding efficient ways to address age-related cancers is crucial. This article discusses endoscopic approaches for gastric cancer diagnostics and reviews progress in emerging technologies that can enhance gastrointestinal cancer diagnostics. The challenges and a possible configuration of a system capable of biomimetic endoscopic vision, label-free tissue characterization, and intelligently automated cancer diagnostics are also discussed.
BIOPHYSICS REVIEWS
(2023)
Review
Materials Science, Multidisciplinary
Se-Yeon Heo, Gil Ju Lee, Young Min Song
Summary: This review highlights recent progress and continued efforts in photonic radiators for daytime radiative cooling. It provides an overview of the fundamentals of passive radiative cooling, assesses advances in radiators in various fields, discusses self-adaptive radiative thermostats, and explores potential solutions to limitations and emerging issues in passive radiative cooling.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)