scholarly journals THz – ToF Optical Layer Analysis (OLA) to determine optical properties of dielectric materials

2017 ◽  
Author(s):  
Holger Spranger ◽  
Jörg Beckmann
Keyword(s):  
Optical Properties ◽  
Dielectric Materials ◽  
Layer Analysis ◽  
Optical Layer

scholarly journals Linear and nonlinear optical properties of hybrid metallic–dielectric plasmonic nanoantennas

2016 ◽  
Vol 7 ◽  
pp. 111-120 ◽  
Author(s):  
Mario Hentschel ◽  
Bernd Metzger ◽  
Bastian Knabe ◽  
Karsten Buse ◽  
Harald Giessen
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Response ◽  
High Efficiency ◽  
Dielectric Materials ◽  
Nonlinear Optical Properties ◽  
Linear Optical Properties ◽  
Linear And Nonlinear ◽  
Linear Optical

We study the linear and nonlinear optical properties of hybrid metallic–dielectric plasmonic gap nanoantennas. Using a two-step-aligned electron beam lithography process, we demonstrate the ability to selectively and reproducibly fill the gap region of nanoantennas with dielectric nanoparticles made of lithium niobate (LiNbO3) with high efficiency. The linear optical properties of the antennas are modified due to the large refractive index of the material. This leads to a change in the coupling strength as well as an increase of the effective refractive index of the surrounding. The combination of these two effects causes a red- or blue-shift of the plasmonic modes, respectively. We find that the nonlinear optical properties of the combined system are only modified in the range of one order of magnitude. The observed changes in our experiments in the nonlinear emission can be traced to the changed dielectric environment and thus the modified linear optical properties. The intrinsic nonlinearity of the dielectric used is in fact small when compared to the nonlinearity of the metallic part of the hybrid antennas. Thus, the nonlinear signals generated by the antenna itself are dominant in our experiments. We demonstrate that the well-known nonlinear response of bulk dielectric materials cannot always straightforwardly be used to boost the nonlinear response of nanoscale antenna systems. Our results significantly deepen the understanding of these interesting hybrid systems and offer important guidelines for the design of nanoscale, nonlinear light sources.

Functional Metamaterials Based on Mesoscale Gold Sponges, Particulate Aggregates, and Their Composites with Dielectric Materials

2006 ◽  
Vol 964 ◽  
Author(s):  
Michael Cortie ◽  
Abbas Maaroof ◽  
Geoff B Smith
Keyword(s):  
Phase Transition ◽  
Optical Properties ◽  
Plasmon Resonance ◽  
Composite Structures ◽  
Dielectric Materials ◽  
Continuous Phase ◽  
Metallic Phase ◽  
Dipole Approximation ◽  
Functional Material ◽  
Nanoscale Composites

ABSTRACTThe optical properties of some nanoscale composites may deviate from that expected from a simple law of mixture of their individual components. In these cases the resulting structure can be considered to be a type of “metamaterial”. Here we explore some of the possibilities for nanoscale composite structures comprised of gold and VO2 – the latter being a functional material that undergoes a reversible insulator to metallic phase transition at 68°C. Two microstructures are examined: aggregates of gold nanoparticles surrounded by VO2 as the continuous phase, and its geometric inverse, mesoporous gold sponge with discontinuous VO2 inclusions. A composite, right-angled parallelepiped measuring 40×100×100 nm is taken as representative of the mixture, and calculations of the optical properties performed using the discrete dipole approximation code of Draine and Flatau. The VO2 matrix strongly attenuates the dipole-dipole plasmon resonance of the gold structure, and thermochromic switching of the remaining plasmon resonance occurs

Study of the thermal properties of polymeric dielectric materials by photothermal technique

1998 ◽  
Vol 511 ◽  
Author(s):  
Chuan Hu ◽  
Ennis T. Ogawa ◽  
Michael F. Hay ◽  
Paul S. Ho
Keyword(s):  
Optical Properties ◽  
Thermal Properties ◽  
Thermal Diffusivity ◽  
Dielectric Materials ◽  
Dielectric Medium ◽  
Photothermal Technique ◽  
Thermal Anisotropy ◽  
Integrated Devices ◽  
Out Of Plane ◽  
Low K

ABSTRACTIn this paper, we present some results of the newly developed on-wafer photothermal measurement. To study thermal anisotropy, the out-of-plane thermal diffusivity measured from this technique is compared with the in-plane thermal diffusivity by measured by ISTS [1]. In addition to the thermal properties, the agreement with mechanical [2] and optical properties are also shown. The significance of different thermal performance between low K dielectric medium materials and SiO2 suggests that greater attention should be paid to thermal properties for integrated devices with low K materials.

scholarly journals Electrical and optical properties of transition metal dichalcogenides on talc dielectrics

Nanoscale ◽  
2021 ◽  
Author(s):  
Darren Nutting ◽  
Gabriela Augusta Prando ◽  
Marion Severijnen ◽  
Ingrid Barcelos ◽  
Shi Guo ◽  
...  
Keyword(s):  
Optical Properties ◽  
Transition Metal ◽  
Defect Density ◽  
Transition Metal Dichalcogenides ◽  
Dielectric Materials ◽  
High Quality ◽  
Electrical And Optical Properties ◽  
Metal Dichalcogenides ◽  
Vdw Heterostructure ◽  
Heterostructure Devices

Advanced van der Waals (vdW) heterostructure devices rely on the incorporation of high quality dielectric materials which need to possess a low defect density as well as being atomically smooth...

scholarly journals Bio-inspired spatially variant photonic crystals for self-collimation and beam-steering applications in the near-infrared spectrum

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rudra Gnawali ◽  
Andrew Volk ◽  
Imad Agha ◽  
Tamara E. Payne ◽  
Amit Rai ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photonic Crystals ◽  
Near Infrared ◽  
Beam Steering ◽  
Logic Gate ◽  
Logic Gates ◽  
Dielectric Materials ◽  
Optical Systems ◽  
Optical Logic ◽  
Spatially Variant

AbstractThe self-collimation of light through Photonic Crystals (PCs) due to their optical properties and through a special geometric structure offers a new form of beam steering with highly optical control capabilities for a range of different applications. The objective of this work is to understand self-collimation and bending of light beams through bio-inspired Spatially Variant Photonic Crystals (SVPCs) made from dielectric materials such as silicon dioxide and common polymers used in three-dimensional printing like SU-8. Based upon natural PCs found in animals such as butterflies and fish, the PCs developed in this work can be used to manipulate different wavelengths of light for optical communications, multiplexing, and beam-tuning devices for light detection and ranging applications. In this paper, we show the optical properties and potential applications of two different SVPC designs that can control light through a 90-degree bend and optical logic gates. These two-dimensional SVPC designs were optimized for operation in the near-infrared range of approximately 800–1000 nm for the 90-degree bend and 700–1000 nm for the optical logic gate. These SVPCs were shown to provide high transmission through desired regions with low reflection and absorption of light to prove the potential benefits of these structures for future optical systems.

Bio-Inspired Spatially Variant Photonic Crystals for Beam-Steering Applications

2021 ◽  
Author(s):  
Rudra Gnawali ◽  
Andrew Volk ◽  
Imad Agha ◽  
Tamara Payne ◽  
Jimmy Touma
Keyword(s):  
Optical Properties ◽  
Photonic Crystals ◽  
Beam Steering ◽  
Logic Gate ◽  
Logic Gates ◽  
Dielectric Materials ◽  
Optical Systems ◽  
Infrared Range ◽  
Optical Logic ◽  
Spatially Variant

Abstract The self-collimation of light through Photonic Crystals (PCs) due to their optical properties and through a special geometric structure offers a new form of beam steering with highly optical control capabilities for a range of different applications. The objective of this work is to understand self-collimation and bending of light beams through Spatially Variant Photonic Crystals (SVPCs) made from dielectric materials such as silicon dioxide as well as common polymers used in three-dimensional printing like SU-8. These PCs can be used for optical communications, multiplexing, and beam-tuning devices for light detection and ranging applications. In this paper we show the optical properties and potential applications of two different SVPC designs that can control light through a 90-degree bend and optical logic gates. These two-dimensional SVPC designs were optimized for operation in the near-infrared range of approximately 800–1000 nm for the 90-degree bend and 700-100nm for the optical logic gate. These SVPCs were shown to provide high transmission through desired regions with low reflection and absorption of light to prove the potential benefits of these structures for future optical systems.

scholarly journals In situ monitoring the optical properties of dielectric materials during ion irradiation

2016 ◽  
Vol 6 (3) ◽  
pp. 734 ◽  
Author(s):  
O. Peña-Rodríguez ◽  
M.L. Crespillo ◽  
P. Díaz-Nuñez ◽  
J.M. Perlado ◽  
A. Rivera ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ion Irradiation ◽  
Dielectric Materials ◽  
In Situ Monitoring

Optical properties of one-dimensional defective photonic crystal containing nanocomposite material

2017 ◽  
Vol 26 (01) ◽  
pp. 1750007 ◽  
Author(s):  
Arafa H. Aly ◽  
Hussein A. Elsayed ◽  
Christina Malek
Keyword(s):  
Optical Properties ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Volume Fraction ◽  
Dielectric Materials ◽  
Defect Layer ◽  
Nanocomposite Materials ◽  
One Dimensional ◽  
Plasmon Frequency ◽  
Metal Thickness

We have obtained the optical properties of one-dimensional defective photonic crystals containing nanocomposite materials of Ag as a defect layer in UV region; the permittivity of nanocomposite materials depends on plasmon frequency of metal nanoparticles. Our analysis is based on the fundamentals of the transfer matrix method. We have investigated the effect of many parameters such as metal thickness, volume fraction, and defected dielectric materials on the intensity of a defect layer.

Optical properties of multilayers composed of silver and dielectric materials

2003 ◽  
Vol 442 (1-2) ◽  
pp. 212-216 ◽  
Author(s):  
Yuko Tachibana ◽  
Kouji Kusunoki ◽  
Toshiya Watanabe ◽  
Kazuhito Hashimoto ◽  
Hisashi Ohsaki
Keyword(s):  
Optical Properties ◽  
Dielectric Materials
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