scholarly journals Far-field excitation of single graphene plasmon cavities with ultracompressed mode volumes

Science ◽  
2020 ◽  
Vol 368 (6496) ◽  
pp. 1219-1223 ◽  
Author(s):  
Itai Epstein ◽  
David Alcaraz ◽  
Zhiqin Huang ◽  
Varun-Varma Pusapati ◽  
Jean-Paul Hugonin ◽  
...  
Keyword(s):  
Nanometer Scale ◽  
Large Momentum ◽  
Far Field ◽  
Low Loss ◽  
Mid Infrared ◽  
Long Wavelength ◽  
Broadband Spectrum ◽  
Field Excitation ◽  
Micrometer Scale ◽  
Coupling Phenomena

Acoustic graphene plasmons are highly confined electromagnetic modes carrying large momentum and low loss in the mid-infrared and terahertz spectra. However, until now they have been restricted to micrometer-scale areas, reducing their confinement potential by several orders of magnitude. Using a graphene-based magnetic resonator, we realized single, nanometer-scale acoustic graphene plasmon cavities, reaching mode volume confinement factors of ~5 × 10–10. Such a cavity acts as a mid-infrared nanoantenna, which is efficiently excited from the far field and is electrically tunable over an extremely large broadband spectrum. Our approach provides a platform for studying ultrastrong-coupling phenomena, such as chemical manipulation via vibrational strong coupling, as well as a path to efficient detectors and sensors operating in this long-wavelength spectral range.

scholarly journals Nonlinear optical response of low loss silicon germanium waveguides in the mid-infrared

2015 ◽  
Vol 23 (7) ◽  
pp. 8261 ◽  
Author(s):  
L. Carletti ◽  
P. Ma ◽  
Y. Yu ◽  
B. Luther-Davies ◽  
D. Hudson ◽  
...  
Keyword(s):  
Silicon Germanium ◽  
Nonlinear Optical ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Low Loss ◽  
Mid Infrared

scholarly journals A compact Ge-rich graded-index SiGe platform with broadband low-loss propagation in the mid infrared

2018 ◽  
Author(s):  
Joan Manel Ramirez ◽  
Qiankun Liu ◽  
Vladyslav Vakarin ◽  
Jacopo Frigerio ◽  
Andrea Ballabio ◽  
...  
Keyword(s):  
Low Loss ◽  
Mid Infrared ◽  
Graded Index

Highly stable, monolithic, single-mode mid-infrared supercontinuum source based on low-loss fusion spliced silica and fluoride fibers

2016 ◽  
Vol 41 (5) ◽  
pp. 946 ◽  
Author(s):  
Ke Yin ◽  
Bin Zhang ◽  
Jinmei Yao ◽  
Linyong Yang ◽  
Shengping Chen ◽  
...  
Keyword(s):  
Single Mode ◽  
Low Loss ◽  
Mid Infrared

Generalized Kerker effect in PT-symmetric nanoantenna array

2022 ◽  
Author(s):  
Jinal Tapar ◽  
Saurabh Kishen ◽  
Naresh Kumar Emani
Keyword(s):  
Scattered Field ◽  
Far Field ◽  
Low Loss ◽  
Spectral Singularity ◽  
Scattering Coefficients ◽  
Scattering Response ◽  
Nanophotonic Structures ◽  
Different Order ◽  
Lattice Modes ◽  
Nanoantenna Arrays

Abstract All-dielectric nanophotonics is a rapidly developing and practical alternative to plasmonics for nanoscale optics. The electric and magnetic Mie resonances in high-index low-loss dielectric nanoresonators can be engineered to exhibit unique scattering response. Recently, nanophotonic structures satisfying parity-time (PT) symmetry have been shown to exhibit novel scattering responses beyond what can be achieved from the conventional nanoresonators. The complex interference of the magnetic and electric Mie resonances and lattice modes excited in PT-symmetric nanoantenna arrays give rise to a scattering anomaly called lasing spectral singularity (SS), where the scattering coefficients tend to infinity. In our previous work [1], we demonstrated the existence of lasing spectral singularities in vertically stacked 2D GaInP PT-symmetric metasurface. In this paper, we analyze the direction-sensitive scattering response of the PT-symmetric GaInP metasurface by decomposing the total scattered field into the electric and magnetic multipoles. The far-field scattering response at the singularity is highly asymmetric for incidence from either the gain or loss side and can be tuned by changing the geometry. By analyzing the phase of even- and odd-parity higher order multipoles, we explain the observed scattering response over a broad parameter space in terms of generalized Kerker effect. The interference between the direction-dependent excitation of different order multipoles and the overall 2D-lattice resonance opens a route towards designing a special class of tunable sources exhibiting direction-sensitive emission properties.

scholarly journals Mid-Infrared Spectroscopy of Four 21μm Emission Band Sources

1993 ◽  
Vol 155 ◽  
pp. 341-341
Author(s):  
K. Justtanont ◽  
M. J. Barlow ◽  
C. J. Skinner
Keyword(s):  
Infrared Spectroscopy ◽  
Wavelength Range ◽  
Emission Band ◽  
Emission Feature ◽  
Full Spectrum ◽  
Mid Infrared ◽  
Mid Infrared Spectroscopy ◽  
Long Wavelength ◽  
Spectroscopic Observations ◽  
Narrow Emission

We report 10 and 20μm spectroscopic observations of four C–rich post–AGB objects which exhibit the unidentified emission feature at 21μm. The observations were carried out in October 1990 and May 1991 using CGS3 on UKIRT. The spectral resolutions were 70 for the wavelength range of 7.4–13.3μm and 80 for the region between 15.4–24.1μm. Three of the sources reported here are from the list of Kwok, Volk & Hrivnak (1989), i.e., IRAS 04296+3429; IRAS 07134+1005 and IRAS 22272+5435. Figure 1 shows the full spectrum of IRAS 04296+3429 and IRAS 22272+5435. The 10μm spectra of these objects exhibit UIR bands whose peaks all fall longwards of the usual peak wavelengths associated with such features. This may be related to the fact that they are the lowest excitation objects so far found to exhibit UIR emission bands. We also found narrow emission features superimposed on the long wavelength wing of the 21μm emission bands of IRAS 04296+3429 and IRAS 22272+5435. The fourth object we observed, SAO 163075, was found to also exhibit a (weak) 21μm emission feature. However, there is no PAH features in the 10μm region, apart from the plateau at 12μm.

scholarly journals Graphene-Coated Elliptical Nanowires for Low Loss Subwavelength Terahertz Transmission

2019 ◽  
Vol 9 (11) ◽  
pp. 2351 ◽  
Author(s):  
Da Teng ◽  
Kai Wang ◽  
Zhe Li ◽  
Yongzhe Zhao ◽  
Gao Zhao ◽  
...  
Keyword(s):  
Chemical Potential ◽  
Infrared Range ◽  
Support Surface ◽  
Low Loss ◽  
Propagation Length ◽  
Promising Alternative ◽  
Mid Infrared ◽  
Terahertz Transmission ◽  
Mode Area ◽  
Thz Waves

Graphene has been recently proposed as a promising alternative to support surface plasmons with its superior performances in terahertz and mid-infrared range. Here, we propose a graphene-coated elliptical nanowire (GCENW) structure for subwavelength terahertz waveguiding. The mode properties and their dependence on frequency, nanowire size, permittivity and chemical potential of graphene are studied in detail by using a finite element method, they are also compared with the graphene-coated circular nanowires (GCCNWs). Results showed that the ratio of the long and short axes (b/a) of the elliptical nanowire had significant influence on mode properties, they also showed that a propagation length over 200 μm and a normalized mode area of approximately 10−4~10−3 could be obtained. Increasing b/a could simultaneously achieve both long propagation length and very small full width at half maximum (FWHM) of the focal spots. When b/a = 10, a pair of focal spots about 40 nm could be obtained. Results also showed that the GCENW had a better waveguiding performance when compared with the corresponding GCCNWs. The manipulation of Terahertz (THz) waves at a subwavelength scale using graphene plasmon (GP) may lead to applications in tunable THz components, imaging, and nanophotonics.

scholarly journals Ramesh Shrestha, Sheng Shen and Maarten P. de Boer *

Actuators ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 71 ◽  
Author(s):  
Ramesh Shrestha ◽  
Sheng Shen ◽  
Maarten P. de Boer
Keyword(s):  
Thermal Properties ◽  
Molecular Chain ◽  
Nanometer Scale ◽  
Mechanical And Thermal Properties ◽  
Polymer Nanofibers ◽  
Scale Size ◽  
Scale Test ◽  
High Degree ◽  
Micrometer Scale ◽  
Measurement Artifacts

Because they can achieve a high degree of molecular chain alignment in comparison with their bulk counterparts, the mechanical and thermal properties of polymer nanofibers are of great interest. However, due to their nanometer-scale size, it is difficult to manipulate, grip, and test these fibers. Here, we demonstrate simple repeatable methods to transfer as-drawn fibers to micrometer-scale test platforms where their properties can be directly measured. Issues encountered and methods to minimize measurement artifacts are also discussed.

scholarly journals Development of low‐loss lead‐germanate glass for mid‐infrared fiber optics: II. preform extrusion and fiber fabrication

2020 ◽  
Vol 104 (2) ◽  
pp. 833-850 ◽  
Author(s):  
Pengfei Wang ◽  
Alson Kwun Leung Ng ◽  
Alastair Dowler ◽  
Heike Ebendorff‐Heidepriem
Keyword(s):  
Fiber Optics ◽  
Lead Germanate ◽  
Low Loss ◽  
Germanate Glass ◽  
Mid Infrared ◽  
Fiber Fabrication
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