The interest in high quality factor (high-Q) resonances in metasurfaces has been rekindled with the rise of the bound states in the continuum (BIC) paradigm, which describes resonances with apparently limitlessly high quality-factors (Q-factors). The application of BICs in realistic systems requires the consideration of the angular tolerance of resonances, however, which is an issue that has not yet been addressed. Here, we develop an ab-initio model, based on temporal coupled mode theory, to describe the angular tolerance of distributed resonances in metasurfaces that support both BICs and guided mode resonances (GMRs). We then discuss the idea of a metasurface with a perturbed unit cell, similar to a supercell, as an alternative approach for achieving high-Q resonances and we use the model to compare the two. We find that, while sharing the high-Q advantage of BIC resonances, perturbed structures feature higher angular tolerance due to band planarization. This observation suggests that such structures offer a route toward high-Q resonances that are more suitable for applications.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OL.475601 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Color arrestor pixels for high-fidelity, high-sensitivity imaging sensors.
Nanophotonics
July 2024
Department of Materials Science and Engineering, KAIST, Daejeon 34141, Republic of Korea.
Silicon is the dominant material in complementary metal-oxide-semiconductor (CMOS) imaging devices because of its outstanding electrical and optical properties, well-established fabrication methods, and abundance in nature. However, with the ongoing trend toward electronic miniaturization, which demands smaller pixel sizes in CMOS image sensors, issues, such as crosstalk and reduced optical efficiency, have become critical. These problems stem from the intrinsic properties of Si, particularly its low absorption in the long wavelength range of the visible spectrum, which makes it difficult to devise effective solutions unless the material itself is changed.
View Article and Find Full Text PDFDeep-subwavelength multilayered meta-coatings for visible-infrared compatible camouflage.
Nanophotonics
May 2024
Department of Materials Science & Institute of Optoelectronics, Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception, Fudan University, Shanghai 200433, China.
Camouflage is a common technique in nature, enabling organisms to protect themselves from predators. The development of novel camouflage technologies, not only in fundamental science, but also in the fields of military and civilian applications, is of great significance. In this study, we propose a new type of deep-subwavelength four-layered meta-coating consisting of Si, Bi, Si, and Cr from top to bottom with total thickness of only ∼355 nm for visible-infrared compatible camouflage.
View Article and Find Full Text PDFMulti-level DOEs are always desired for the wider application. However, they require more accurate fabrication and expensive production costs. This paper presents an improved stacked DOEs method.
View Article and Find Full Text PDFDesign and Manufacture of 30-Degree Projection Lens for Augmented Reality Waveguide.
Micromachines (Basel)
September 2024
Department of Optics and Photonics, National Central University, Chungli 32001, Taiwan.
A projection lens with a 30-degree field of view is developed for use in augmented reality (AR) glasses, including a waveguide combiner designed for a 0.35-inch LCoS panel. The entrance pupil diameter of the lens is 14 mm and the lens has an effective focal length of 16.
View Article and Find Full Text PDFA 5-week centrifuge-based G training with feedback on the magnitude of G force does not improve the perception of roll tilt during simulated coordinated turns.
J Neurophysiol
November 2024
Division of Environmental Physiology, Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden.
When entering a coordinated flight turn without visual references, the perception of roll-angular displacement is determined by vestibular cues, and/or probably by assessment of the gravitoinertial (G) load (G magnitude) and its translation into the corresponding bank angle. Herein, we examined whether repeated exposures to hypergravity (G training) in a centrifuge, would advance, not only the ability to accurately assess the G load but also the capacity to detect or estimate the corresponding roll inclination of the centrifuge gondola. To this end, in nine men without piloting experience, the subjective estimation of G load and roll tilt were assessed, in complete darkness, during 5-min coordinated turns in the centrifuge, performed at 1.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!