Results 71 to 80 of about 196,486 (281)

High‐Transmission Mid‐Infrared Bandpass Filters using Hybrid Metal‐Dielectric Metasurfaces for CO2 Sensing

Advanced Optical Materials, Volume 13, Issue 8, March 13, 2025.
This article presents a hybrid metal‐dielectric metasurface in transmission mode for mid‐infrared (MIR) spectroscopy. Composed of germanium on aluminium cylinders atop a calcium fluoride substrate, the metasurface achieves 80% transmission efficiency at λ = 2.6 µm with a narrow full‐width‐half‐maximum of 0.4 µm.
Amr Soliman, C Williams, Richard Hopper, Florin Udrea, Haider Butt, Timothy D. Wilkinson   +5 more
wiley   +1 more source

Far-Ultraviolet Dust Albedo Measurements in the Upper Scorpius Cloud Using the SPINR Sounding Rocket Experiment

, 2009
The Spectrograph for Photometric Imaging with Numeric Reconstruction (SPINR) sounding rocket experiment was launched on 2000 August 4 to record far-ultraviolet (912-1450 A) spectral and spatial information for the giant reflection nebula in the Upper ...
Abgrall, Abgrall, Allers, Burgh, Burgh, Carter, Clayton, Cook, de Geus, de Jager, Draine, Fitzpatrick, France, France, France, France, Gordon, Gordon, Hoffleit, Jakobsen, K. D. Gordon, K. France, K. P. Wilton, Kurucz, Lee, Leitherer, Lewis, Martini, Mathis, Misselt, N. K. Lewis, Papaj, Rachford, S. Chakrabarti, Skrutskie, Sofia, Sujatha, Sujatha, T. A. Cook, Thé, Wegner, Weingartner, Wesselius, Wu, Zubko   +44 more
core   +1 more source

Bandpass line codes

Electronics Letters, 1992
In the letter we present block codes and finite-state-machine codes with higher-order spectral zeros at DC for applications where a speech channel and a baseband digital signal are simultaneously transmitted on the same twisted pair, as in the asymmetrical digital subscriber line (ADSL)
L. Fouché, L. Botha, H.C. Ferreira
openaire   +1 more source

A Multi‐Resonant Tunable Fabry‐Pérot Cavity for High Throughput Spectral Imaging

Advanced Optical Materials, Volume 13, Issue 8, March 13, 2025.
This study introduces a multi‐resonant tunable Fabry‐Pérot filter for high throughput spectral imaging. With a spectral resolution of 10 nm and a switching time of 23 ms, this compact and low‐cost device possesses better spectral imaging accuracy in poor light conditions while maintaining over six times higher optical throughput than standard liquid ...
Xiao Wu, Zijian Lin, Shige Tang, Xiao Chen, Tingbiao Guo, Sailing He   +5 more
wiley   +1 more source

Micromachined Double‐Membrane Mechanically Tunable Metamaterial for Thermal Infrared Filtering

Advanced Photonics Research, Volume 6, Issue 5, May 2025.
Herein, a mechanically tunable double‐layer plasmonic metamaterial leveraging the extraordinary optical transmission effect observed in subwavelength arrays of openings within thin metal layers is presented. The concept is experimentally validated by integrating the proposed metamaterial structure into an electrostatic parallel‐plate actuator to create
Oleg Bannik, Fedor Kovalev, Mingkai Liu, Michal Zawierta, Dilusha Silva, Lorenzo Faraone, Mariusz Martyniuk, Ilya Shadrivov   +7 more
wiley   +1 more source

Balanced Linear-Phase Bandpass Filter Equalized with Negative Group Delay Circuit [PDF]

Radioengineering
A novel balanced linear-phase bandpass filter is proposed to achieve differential-mode linear-phase filtering and common-mode suppression characteristics.
Z. C. Wang, Z. B. Wang, M. Gao, H. Liu, S. Fang   +4 more
doaj  

Higher Order Bandpass Single and Dual Band Frequency Selective Surfaces With Aperture Coupled Patch Resonators

IEEE Access
In this article, a low profile aperture coupled single and dual band higher order bandpass frequency selective surface (FSS) is proposed. Initially, a basic patch resonator with L-shape truncated corner is investigated theoretically so that two ...
K. N. Mohan, Yogesh Kumar Choukiker
doaj   +1 more source

Invited Article: Narrowband terahertz bandpass filters employing stacked bilayer metasurface antireflection structures

APL Photonics, 2018
We experimentally demonstrate high-performance narrowband terahertz (THz) bandpass filters through cascading multiple bilayer metasurface antireflection structures.
Chun-Chieh Chang, Li Huang, John Nogan, Hou-Tong Chen   +3 more
doaj   +1 more source

Harnessing Ultrafast Optical Pulses for 3D Microfabrication by Selective Tweezing and Immobilization of Colloidal Particles in an Integrated System

Advanced Photonics Research, Volume 6, Issue 5, May 2025.
Microfabrication using nano‐ to micron‐sized blocks has transformative potential for next‐gen electronics, optoelectronics, and materials. Traditional methods are limited by scalability and precision. STIC, a single‐laser system for precise colloid manipulation and immobilization using femtosecond lasers, is introduced that enables efficient 3D ...
Krishangi Krishna, Jieliyue Sun, Wenyu Liu, Robert H. Hurt, Kimani C. Toussaint Jr.   +4 more
wiley   +1 more source

Narrow band photometry of selected asteroids [PDF]

The CCD photometry of selected asteroids was carried out to check for possible cometary activity in them. To distinguish the asteroids with possible cometary activity from those of the main belt, each object of interest was observed in two filters; one ...
Bhargavi, S. G., Rajamohan, R.
core   +1 more source