Optical ReviewPub Date : 2024-07-12DOI: 10.1007/s10043-024-00899-z
Narumi Asato, Ryushi Fujimura
{"title":"Tunable plasmonic resonance by photothermal deformation in Ag-SiO2 semi-shell nanostructures and enlargement of the controllable spectral region by UV-curable resin","authors":"Narumi Asato, Ryushi Fujimura","doi":"10.1007/s10043-024-00899-z","DOIUrl":"https://doi.org/10.1007/s10043-024-00899-z","url":null,"abstract":"<p>The Ag semi-shell, a nanostructure comprising a dielectric nanosphere partially covered with Ag metal, can have its metallic shell deformed through a melting process under the illumination of plasmonic resonance. We have investigated the photothermal deformation process in Ag semi-shells and observed intensity-dependent melting deformation of the shell and a corresponding blueshift of the resonance peak. This indicates that the plasmonic resonance of the Ag semi-shells can be continuously controlled through laser irradiation. Furthermore, when the Ag semi-shells were coated with a UV-curable resin, the initial resonance peak wavelength was red-shifted, and the controllable spectral region was increased by a factor of two compared to that without the UV-curable resin. This large continuous control of the optical response through melting deformation of the shell has potential applications in optical memory, plasmonic color, and other areas.</p>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"42 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141597764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical ReviewPub Date : 2024-07-12DOI: 10.1007/s10043-024-00896-2
Haruyuki Sano, Masashi Kuwahara
{"title":"Multiphysics simulation of optical gate switch operation using a chalcogenide phase-change material","authors":"Haruyuki Sano, Masashi Kuwahara","doi":"10.1007/s10043-024-00896-2","DOIUrl":"https://doi.org/10.1007/s10043-024-00896-2","url":null,"abstract":"<p>To gain a complete understanding of the optical switch that uses phase-change material, Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> (GST), we conducted a simulation considering various physical phenomena related to the switch, such as electrical conduction, Joule heating, heat diffusion, phase change of GST, and light propagation. It was found that the phase state (amorphous and crystalline) of the GST film can be controlled by applying an appropriate pulse voltage to the indium tin oxide (ITO) heater layer, thereby changing the transmittance of the optical switch. Calculations showed that during cooling in the amorphization process, part of the GST film was recrystallized, reducing the transmittance of the optical switch in the ON state. Moreover, the large temperature difference in the GST film during heating was caused by a substantial amount of Joule heat generated in the region distant from the GST film. This difference in distance from the heat-generating region resulted in a considerable temperature difference in the GST film. Thus, herein, we have proposed modified model structures to reduce this temperature difference in the GST film, which can recrystallize during the amorphization process. Calculation using the modified model structures revealed that increasing the thickness of the ITO heater layer, over which the GST film was not placed, can effectively reduce the temperature difference and eventually suppress recrystallization.</p>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"37 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141597699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical ReviewPub Date : 2024-07-09DOI: 10.1007/s10043-024-00897-1
Tianjiang He, Suping Liu, Wei Li, Xiaoyu Ma
{"title":"Studying the suppression of quantum well intermixing in primary epitaxial wafers via oxygen ion bombardment","authors":"Tianjiang He, Suping Liu, Wei Li, Xiaoyu Ma","doi":"10.1007/s10043-024-00897-1","DOIUrl":"https://doi.org/10.1007/s10043-024-00897-1","url":null,"abstract":"<p>In the pursuit of creating non-absorption window (NAW) structures in high-power semiconductor laser cavities, techniques like impurity-free vacancy diffusion and rapid thermal annealing induced quantum well intermixing were employed. The challenge is to induce a desired 30 nm blue shift while safeguarding the gain-emitting region from high-temperature annealing O<sup>2−</sup> bombardment effectively inhibits quantum well mixing, as demonstrated through experiments. Epitaxial wafers subjected to this treatment exhibit just a 1 nm blue shift, compared to 32 nm without O<sup>2−</sup> bombardment. These findings provide essential insights for protecting the gain-emitting region during NAW structure fabrication.</p>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"77 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141566317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical ReviewPub Date : 2024-07-06DOI: 10.1007/s10043-024-00895-3
Asahi Saito, Yonghao Yue, Naoya Koizumi
{"title":"Simulating the Appearance of Aerial Images formed by Aerial Imaging by Retroreflection","authors":"Asahi Saito, Yonghao Yue, Naoya Koizumi","doi":"10.1007/s10043-024-00895-3","DOIUrl":"https://doi.org/10.1007/s10043-024-00895-3","url":null,"abstract":"<p>Ray tracing, combined with ideal retroreflection and mathematical simulation methods, has been used to design aerial imaging systems based on retroreflection. Although aerial images are blurred and have lower brightness than the light source, existing simulation methods do not focus on the appearance of these characteristics. In this study, we propose a computer graphics (CG)-based simulation using the ray tracing method to generate CG renditions of aerial images with reproduced luminance and blurring. CG models of three optical elements (light source, half-mirror, and retroreflector) were created on the basis of existing optical element models to simulate aerial images obtained through retroreflection in aerial imaging systems. By measuring the image formation positioning, we determined that the rendered aerial images consistently formed at a plane-symmetrical position relative to the axis of the half-mirror model, with a mean absolute error of <span>({0.55,textrm{mm}})</span>. We also compared rendered and actual aerial images in terms of luminance and sharpness characteristics, and found that the mean absolute percentage error of luminance remained within <span>(0.0376)</span>. Furthermore, the directional dependence of blur was effectively reproduced using the retroreflector bidirectional reflectance distribution function developed in this study.</p>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"16 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141553516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical ReviewPub Date : 2024-06-24DOI: 10.1007/s10043-024-00891-7
Nathan Hagen, Yukitoshi Otani
{"title":"Using polarization cameras for snapshot imaging of phase, depth, and spectrum","authors":"Nathan Hagen, Yukitoshi Otani","doi":"10.1007/s10043-024-00891-7","DOIUrl":"https://doi.org/10.1007/s10043-024-00891-7","url":null,"abstract":"<p>By encoding object information (object phase, surface height, spectrum) into the polarization state, we can use polarization cameras to image other dimensions of the light field while viewing dynamic scenes. We discuss three recent examples of such video polarization encoding, allowing for quantitative imaging of transparent micro-organisms, for measurement of dynamic surface shape, and for compact spectral imaging.</p>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"20 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141444867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effects of yellow lenses on disability glare from low-beam headlights","authors":"Tatsuya Iizuka, Takushi Kawamorita, Shuya Suzuki, Hitoshi Ishikawa","doi":"10.1007/s10043-024-00893-5","DOIUrl":"https://doi.org/10.1007/s10043-024-00893-5","url":null,"abstract":"<p>Yellow glasses for nighttime driving are marketed as tools that can reduce headlight glare and improve visibility by cutting blue light. However, only few empirical evidences support these benefits. The present study was aimed to assess the effect of yellow lenses on reducing disability from peripheral glare caused by headlights and improving contrast sensitivity. On evaluating contrast sensitivity, the participants wore three types of lenses: clear (with 95% luminance transmission), gray (with 79% luminance transmission), and yellow (with 77% luminance transmission). The glare source was induced using low-beam headlights from oncoming vehicles positioned at a distance of 40 m. The results revealed that wearing gray and yellow lenses at night significantly reduced contrast sensitivity, while wearing yellow lenses under glare conditions slightly improved contrast sensitivity. Despite this slight improvement, the use of yellow lenses at night is not advisable, as the overall disadvantages surpass their benefits. These findings raise questions about the claimed benefits of yellow lenses for nighttime driving and highlight the need for further research to validate the effect of nighttime glasses.</p>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"82 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141444914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical ReviewPub Date : 2024-05-25DOI: 10.1007/s10043-024-00890-8
Yijun Qiu, Shuna Yang, Bo Yang, Hao Chi
{"title":"Optical computation of discrete Fourier transform utilizing the temporal Talbot effect with input pulse trains of finite duration","authors":"Yijun Qiu, Shuna Yang, Bo Yang, Hao Chi","doi":"10.1007/s10043-024-00890-8","DOIUrl":"https://doi.org/10.1007/s10043-024-00890-8","url":null,"abstract":"<p>The temporal Talbot effect (TTE) embodies the phenomenon of discrete Fourier transform (DFT). However, in an ideal temporal Talbot system, an infinitely long pulse train is required as input, which hinders the application of this property in optical computation of DFT. In this paper, we investigate the phenomenon of DFT in the TTE with input pulse trains of finite duration, aiming to apply it to optical computation of DFT. It is found that precise DFT coefficients can be extracted from the output signal of a system with an input pulse train of finite duration, subject to a specific condition on the pulse train’s duration. A significant advantage of the system employing an input pulse train of finite duration is that the resulting output signal becomes band-limited. This crucially implies that an optical receiver with a limited bandwidth can be utilized to obtain a distortionless signal. We provide a concise and rigorous theoretical framework on the TTE-based DFT system, which fully explains the underlying mechanism for perfect DFT calculation and is consistent with simulation results. Furthermore, we have determined that the single-cycle DFT calculation, using an input pulse train of one period, is feasible. The performance of the single-cycle DFT has been systematically evaluated under various non-ideal conditions, such as sampling time jitter and limited detection bandwidth. This research establishes a foundation for future applications of TTE in optical DFT computation, as it removes the requirement of inputting infinitely long pulse trains.</p>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"19 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141096616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Interference effects on light scattering properties of dense colloidal suspensions: a short review","authors":"Hiroyuki Fujii, Hyeonwoo Na, Koyata Nishikawa, Kazumichi Kobayashi, Masao Watanabe","doi":"10.1007/s10043-024-00887-3","DOIUrl":"10.1007/s10043-024-00887-3","url":null,"abstract":"<div><p>Near-infrared spectroscopy and imaging using scattered light potentially evaluate the structural properties of the medium, like the average particle size, based on a relation between its structure and light scattering. A qualitative understanding of light scattering is crucial for developing optical imaging techniques. The scattering properties of dense colloidal suspensions have been extensively investigated using the electromagnetic theory (EMT). The colloidal suspensions are widely used in liquid tissue phantoms for optical imaging techniques and are encountered in various fields, such as the food and chemical industries. The interference between electric fields scattered by colloidal particles significantly influences the scattering properties, so-called the interference effects. Despite many efforts since the 1980s, a complete understanding of the interference effects has still not been achieved. The main reason is the complicated dependence of the interference on the optical wavelength, particle size, and so on. This paper briefly reviews numerical and theoretical studies of the interference effect based on the dependent scattering theory, one of the EMTs, and model equations.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"31 3","pages":"299 - 308"},"PeriodicalIF":1.1,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10043-024-00887-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141079260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical ReviewPub Date : 2024-05-18DOI: 10.1007/s10043-024-00888-2
Shi Bao, Ye Zhao, Yatu Ji, Nier Wu, Gao Le
{"title":"Color transfer method based on saliency features for color images","authors":"Shi Bao, Ye Zhao, Yatu Ji, Nier Wu, Gao Le","doi":"10.1007/s10043-024-00888-2","DOIUrl":"https://doi.org/10.1007/s10043-024-00888-2","url":null,"abstract":"<p>With growing demands for higher image quality in the fields of film, video post-production, image restoration, art creation, and computer vision, color transfer between images has become an important research area. Based on previous research on color transfer techniques, this paper proposes a color transfer method for images based on saliency features, aiming at automatic color migration between them. Transferring colors based on the saliency features of the input image can avoid the problem of unnatural color of the output image due to mixing of colors from different regions. First, the local variances of both the original and reference images are calculated, serving as a temporary saliency feature map. This is followed by obtaining a refined saliency feature map after undergoing processes such as minimization filtering, binarization, expansion, and iteration. Subsequently, color is transferred between the saliency and non-saliency regions of the original and reference images. To avoid the generation of pseudo-contours, the image is then refined using base projection. Finally, an output image is obtained by fusing the base-projected image with the outcome from Reinhard’s method, ensuring the output retains its naturalness and consistency. We conducted experiments with different types of images such as natural landscapes, buildings, and art paintings. The experimental results show that the method proposed in this paper not only retains the intricacies of the original image but also offers fuller and more realistic color renditions.</p>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"38 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140954619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Feasibility test on the analog configuration of electromechanical dimple-tip cantilever for the application of THz metamaterials","authors":"Ying Huang, Taiyu Okatani, Naoki Inomata, Yoshiaki Kanamori","doi":"10.1007/s10043-024-00889-1","DOIUrl":"10.1007/s10043-024-00889-1","url":null,"abstract":"<div><p>We numerically and experimentally developed a cantilever that provided both fast and analog actuation for THz metamaterials (MMs) by properly geometrizing a dimpled tip. Owing to its small size and light mass, the cantilever had a high mechanical resonance at 705 kHz. Cantilever arrays were fabricated with different tip gaps and integrated into a ladder-shaped MM (LS-MM). By changing the tip gap from 0.80 to 0.32 μm, the resonance of the transmittance spectrum changed from 1.235 to 0.795 THz, indicating that the reconfigurable LS-MM was capable of continuously tuning the resonance of the <i>THz</i> wave transmission with the tip gap. Additionally, the dimple served as an anti-stiction structure, providing the cantilever with a fabrication yield of 99.8%. This work shows a practical pathway to high-performance active metamaterials, which holds potential in advanced THz technologies such as 6G communications and fast imaging.</p></div>","PeriodicalId":722,"journal":{"name":"Optical Review","volume":"31 3","pages":"351 - 358"},"PeriodicalIF":1.1,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140919852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}