An optical system for remote sensing in the UV, visible, and NIR spectral ranges

In this work, we propose a high-resolution optical system for Earth remote sensing, operating at 200-3300-nm wavelengths and providing a 4º field of view. Parameters of the system's structural elements are calculated and presented. Dot charts of the spots of confusion for the center, intermediate zones, and the edge of the field are considered. Over most of the operating wavelengths, the optical system is shown to be diffraction-limited, which provides attaining the highest possible spatial resolution. This system is considered as a tool for monitoring of the Earth's surface and collection of information in the ultra-violet, visible and near infrared spectral ranges (200-3300 nanometers).

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Size Effect on Optical Properties of Silicon Dioxide Hollow Particles

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.312.26 ◽

2020 ◽

Vol 312 ◽

pp. 26-31

Author(s):

Viktoriia Iurina ◽

Vitaly V. Neshchimenko ◽

Chun Dong Li

Keyword(s):

Optical Properties ◽

Silicon Dioxide ◽

Near Infrared ◽

Photoelectron Spectra ◽

Hollow Particles ◽

X Ray ◽

Near Ir ◽

Infrared Spectral ◽

Uv Visible ◽

Spectral Ranges

The optical properties of silicon dioxide hollow particles with different size were investigated in UV/visible/near-IR region, as well as X-ray photoelectron spectra were analyzed. Synthesis of SiO2 hollow particles was carried out using a template method. It was established that hollow particle reflectance lower than bulk microparticles. Absorptance in the red and near infrared spectral ranges increases with decreasing size of hollow particles, but in the UV-region conversely. This is due to different absorption centers.

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Integrated Optical Phased Arrays for Beam Forming and Steering

Applied Sciences ◽

10.3390/app11094017 ◽

2021 ◽

Vol 11 (9) ◽

pp. 4017

Author(s):

Yongjun Guo ◽

Yuhao Guo ◽

Chunshu Li ◽

Hao Zhang ◽

Xiaoyan Zhou ◽

...

Keyword(s):

Near Infrared ◽

Phased Arrays ◽

Mechanical Stability ◽

Building Blocks ◽

High Yield ◽

Beam Forming ◽

Integrated Optical ◽

Optical Phased Arrays ◽

Infrared Spectral ◽

Spectral Ranges

Integrated optical phased arrays can be used for beam shaping and steering with a small footprint, lightweight, high mechanical stability, low price, and high-yield, benefiting from the mature CMOS-compatible fabrication. This paper reviews the development of integrated optical phased arrays in recent years. The principles, building blocks, and configurations of integrated optical phased arrays for beam forming and steering are presented. Various material platforms can be used to build integrated optical phased arrays, e.g., silicon photonics platforms, III/V platforms, and III–V/silicon hybrid platforms. Integrated optical phased arrays can be implemented in the visible, near-infrared, and mid-infrared spectral ranges. The main performance parameters, such as field of view, beamwidth, sidelobe suppression, modulation speed, power consumption, scalability, and so on, are discussed in detail. Some of the typical applications of integrated optical phased arrays, such as free-space communication, light detection and ranging, imaging, and biological sensing, are shown, with future perspectives provided at the end.

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Three-dimensional silicon-based nanostructures in opal matrix: Preparation and properties

MRS Proceedings ◽

10.1557/proc-638-f14.45.1 ◽

2000 ◽

Vol 638 ◽

Author(s):

A.B. Pevtsov ◽

V.G. Golubev ◽

V.A. Kosobukin ◽

D.A. Kurdyukov ◽

A.V. Medvedev

Keyword(s):

Near Infrared ◽

Photonic Band Gap ◽

Three Dimensional ◽

Opal Matrix ◽

Variable Extent ◽

Infrared Spectral ◽

Spectral Ranges ◽

Silicon Based ◽

Photonic Band ◽

Matrix Preparation

AbstractThree-dimensional opal-silicon composites with both direct (a variable extent of filling of opal voids with silicon) and inverted structures have been synthesized. A structural analysis of these fabricated systems is performed. Reflectance spectra from the (111) surface of the composites are measured within the spectral range 400-900 nm. Observed spectral features are interpreted as a manifestation of the [111] direction photonic band gap that is tunable in position and width in the visible and near-infrared spectral ranges.

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Tunneling-induced broadband and tunable optical emission from plasmonic nanorod metamaterials

Nanophotonics ◽

10.1515/nanoph-2019-0411 ◽

2020 ◽

Vol 9 (2) ◽

pp. 427-434 ◽

Cited By ~ 5

Author(s):

Alexey V. Krasavin ◽

Pan Wang ◽

Mazhar E. Nasir ◽

Yunlu Jiang ◽

Anatoly V. Zayats

Keyword(s):

Near Infrared ◽

Light Emission ◽

Electron Tunneling ◽

Optical Emission ◽

Light Sources ◽

Incoherent Light ◽

Sensing Platforms ◽

Infrared Spectral ◽

Efficient Coupling ◽

Spectral Ranges

AbstractWe demonstrate a metamaterial platform for electrically driven broadband light emission induced by electron tunneling. Both the Fabry-Perot and waveguided modes of the metamaterial slab as well the plasmonic mode of the tunneling gap are identified as contributing to shaping the emission spectrum. This opens up an opportunity to design the spectrum and polarization of the emitted light by tuning the metamaterial modes via the geometric parameters of the nanostructure throughout the visible and near-infrared spectral ranges. The efficient coupling of the tunneling-induced emission to the waveguided modes is beneficial for the development of integrated incoherent light sources, while the outcoupled emission provides a source of free-space radiation. The demonstrated incoherent nanoscale light sources may find applications in the development of integrated opto-electronic circuits, optical sensing platforms, imaging, and metrology.

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Remote characterization of photosynthetic communities in the Fryxell basin of Taylor Valley, Antarctica

Antarctic Science ◽

10.1017/s0954102020000176 ◽

2020 ◽

Vol 32 (4) ◽

pp. 255-270 ◽

Cited By ~ 2

Author(s):

Mark R. Salvatore ◽

Schuyler R. Borges ◽

John E. Barrett ◽

Eric R. Sokol ◽

Lee F. Stanish ◽

...

Keyword(s):

Remote Sensing ◽

Near Infrared ◽

Microbial Mats ◽

Remote Sensing Data ◽

Spectral Unmixing ◽

Ecological Communities ◽

Dry Valleys ◽

Spectral Signatures ◽

Taylor Valley ◽

Infrared Spectral

AbstractWe investigate the spatial distribution, spectral properties and temporal variability of primary producers (e.g. communities of microbial mats and mosses) throughout the Fryxell basin of Taylor Valley, Antarctica, using high-resolution multispectral remote-sensing data. Our results suggest that photosynthetic communities can be readily detected throughout the Fryxell basin based on their unique near-infrared spectral signatures. Observed intra- and inter-annual variability in spectral signatures are consistent with short-term variations in mat distribution, hydration and photosynthetic activity. Spectral unmixing is also implemented in order to estimate mat abundance, with the most densely vegetated regions observed from orbit correlating spatially with some of the most productive regions of the Fryxell basin. Our work establishes remote sensing as a valuable tool in the study of these ecological communities in the McMurdo Dry Valleys and demonstrates how future scientific investigations and the management of specially protected areas could benefit from these tools and techniques.

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Design of a Smartphone Platform Compact Optical System Operational Both in Visible and Near Infrared Spectral Regime

IEEE Sensors Journal ◽

10.1109/jsen.2018.2832848 ◽

2018 ◽

Vol 18 (12) ◽

pp. 4933-4939 ◽

Cited By ~ 6

Author(s):

Iftak Hussain ◽

Anup Jyoti Bora ◽

Dhrubanka Sarma ◽

Kamal Uddin Ahamad ◽

Pabitra Nath

Keyword(s):

Optical System ◽

Near Infrared ◽

Infrared Spectral

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Remote Sensing of 3-D Geometry and Surface Moisture of a Peat Production Area Using Hyperspectral Frame Cameras in Visible to Short-Wave Infrared Spectral Ranges Onboard a Small Unmanned Airborne Vehicle (UAV)

IEEE Transactions on Geoscience and Remote Sensing ◽

10.1109/tgrs.2016.2565471 ◽

2016 ◽

Vol 54 (9) ◽

pp. 5440-5454 ◽

Cited By ~ 33

Author(s):

Eija Honkavaara ◽

Matti A. Eskelinen ◽

Ilkka Polonen ◽

Heikki Saari ◽

Harri Ojanen ◽

...

Keyword(s):

Remote Sensing ◽

Short Wave ◽

Surface Moisture ◽

Infrared Spectral ◽

Production Area ◽

Short Wave Infrared ◽

Spectral Ranges ◽

Airborne Vehicle

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Progress Toward Crystalline-Silicon-Based Light-Emitting Diodes

MRS Bulletin ◽

10.1557/s0883769400037490 ◽

1993 ◽

Vol 18 (7) ◽

pp. 22-28 ◽

Cited By ~ 59

Author(s):

Leigh Canham

Keyword(s):

Near Infrared ◽

Crystalline Silicon ◽

Light Emitting Diode ◽

Holy Grail ◽

Light Emitting ◽

Vlsi Technology ◽

Materials Research ◽

Infrared Spectral ◽

Spectral Ranges ◽

Silicon Based

The semiconductor silicon is the dominant material in microelectronics and is one of the best-studied materials known to humanity. Its inability to emit light efficiently is therefore well documented. Nevertheless, a “holy grail” of semiconductor materials research has for decades been the realization of an efficient Si light-emitting diode (LED). Such a device would enable optoelectronic circuitry to be based entirely on silicon and would revolutionize VLSI technology since the other required Si-based devices (detectors, waveguides, modulators, etc.) have already been demonstrated. Although this holy grail has proved elusive, the 1990s have heralded greatly renewed interest and optimism in the development of such devices for both the visible and near-infrared spectral ranges. Dramatic progress is at last being made. This review focuses, in a somewhat chronological manner, on the progress of specific approaches to realizing crystalline structures of high radiative efficiency, and the materials constraints involved.

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Remote Sensing of Shaded Area in Vineyards

HortTechnology ◽

10.21273/horttech.15.4.0859 ◽

2005 ◽

Vol 15 (4) ◽

pp. 859-863 ◽

Cited By ~ 9

Author(s):

Lee Johnson ◽

Thibaut Scholasch

Keyword(s):

Remote Sensing ◽

Vegetation Index ◽

Near Infrared ◽

Normalized Difference Vegetation Index ◽

Image Data ◽

Crop Coefficient ◽

Photon Flux ◽

Optical Remote Sensing ◽

Study Results ◽

Infrared Spectral

Airborne multispectral image data were compared with intercepted photosynthetic photon flux (PPF) in commercial winegrape (Vitis vinifera) vineyards of Napa Valley, Calif. An empirically based calibration was applied to transform raw image pixel values to surface reflectance. Reflectance data from the red and near-infrared spectral regions were combined into a normalized difference vegetation index. Strong linear response was observed between the vegetation index and PPF interception ranging from 0.15 to 0.50. Study results suggest the possibility of using optical remote sensing to monitor and map vineyard shaded area, thus providing spatially explicit input to water budget models that invoke evapotranspiration crop coefficient based calculations.

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