An effective third harmonic generator using a left-handed nonlinear transmisson line

2014 ◽  
Vol 56 (3) ◽  
pp. 568-570 ◽  
Author(s):  
In Bok Kim ◽  
Kang Wook Kim ◽  
Hyoungsuk Yoo ◽  
Jonghoo Park ◽  
Hongjoon Kim
Keyword(s):  
Third Harmonic ◽  
Harmonic Generator ◽  
Left Handed

scholarly journals Efficient forward second-harmonic generation from planar archimedean nanospirals

Nanophotonics ◽  
2015 ◽  
Vol 4 (1) ◽  
pp. 108-113 ◽  
Author(s):  
Roderick B. Davidson II ◽  
Jed I. Ziegler ◽  
Guillermo Vargas ◽  
Sergey M. Avanesyan ◽  
Yu Gong ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Average Power ◽  
Two Dimensional ◽  
Harmonic Generator ◽  
Left Handed ◽  
Planar Arrays ◽  
Power Loading ◽  
Axis Of Symmetry

Abstract:The enhanced electric field at plasmonic resonances in nanoscale antennas can lead to efficient harmonic generation, especially when the plasmonic geometry is asymmetric on either inter-particle or intra-particle levels. The planar Archimedean nanospiral offers a unique geometrical asymmetry for second-harmonic generation (SHG) because the SHG results neither from arranging centrosymmetric nanoparticles in asymmetric groupings, nor from non-centrosymmetric nanoparticles that retain a local axis of symmetry. Here, we report forward SHG from planar arrays of Archimedean nanospirals using 15 fs pulses from a Ti:sapphire oscillator tuned to 800 nm wavelength. The measured harmonic-generation efficiencies are 2.6·10−9, 8·10−9 and 1.3·10−8 for left-handed circular, linear, and right-handed circular polarizations, respectively. The uncoated nanospirals are stable under average power loading of as much as 300 μWper nanoparticle. The nanospirals also exhibit selective conversion between polarization states. These experiments show that the intrinsic asymmetry of the nanospirals results in a highly efficient, two-dimensional harmonic generator that can be incorporated into metasurface optics.

Compact Left-Handed Transmission Line as a Linear Phase–Voltage Modulator and Efficient Harmonic Generator

2007 ◽  
Vol 55 (3) ◽  
pp. 571-578 ◽  
Author(s):  
Hongjoon Kim ◽  
Alexander B. Kozyrev ◽  
Abdolreza Karbassi ◽  
Daniel W. van der Weide
Keyword(s):  
Transmission Line ◽  
Linear Phase ◽  
Phase Voltage ◽  
Harmonic Generator ◽  
Left Handed

scholarly journals A Suspended Stripline Frequency Tripler Using a Left-Handed Nonlinear Transmission Line

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
In Bok Kim ◽  
Hongjoon Kim ◽  
Hyun Chul Choi ◽  
Kang Wook Kim
Keyword(s):  
Transmission Line ◽  
Insertion Loss ◽  
Nonlinear Transmission Line ◽  
Pass Filter ◽  
Third Harmonic ◽  
Nonlinear Transmission ◽  
Left Handed ◽  
Varactor Diodes ◽  
Harmonic Conversion ◽  
High Pass

A suspended stripline frequency tripler using a left-handed nonlinear transmission line (LH NLTL) is presented. The proposed tripler using the LH NLTL is composed of a series of varactor diodes, shunt inductances, and a high-pass filter implemented with suspended stripline (SSL). An ultrawideband microstrip-to-suspended stripline transition is also utilized. The fabricated LH NLTL provides the minimum insertion loss of 1.7 dB and the maximum insertion loss of 4.7 dB for a wide frequency band from 2.6 to 18 GHz. As a tripler, the measured minimum third harmonic conversion loss is 15.3 dB at an input frequency of 2.4 GHz and typically 17 dB from 2 to 3.1 GHz.

A Novel Harmonic Control Circuit Based on Composite Right/Left Handed Transmission Lines

2012 ◽  
Vol 236-237 ◽  
pp. 593-596
Author(s):  
Juan Juan Gao ◽  
Gui Zhen Lu
Keyword(s):  
Fundamental Frequency ◽  
Output Power ◽  
Transmission Lines ◽  
Dielectric Resonator ◽  
Control Circuit ◽  
Third Harmonic ◽  
Harmonic Control ◽  
Left Handed ◽  
Harmonic Components

A novel harmonic control circuit based on the composite right/left-handed transmission lines (CRLH TLs) is presented to suppress the harmonic components of the dielectric resonator oscillator (DRO). Firstly, the principles of left-handed transmission lines (LH TLs) are introduced. Then, the design of the proposed harmonic circuit is presented and the simulated results are shown. The second- and third- harmonic components are suppressed, and the output-power at fundamental frequency has increased.

Single molecule optical diffraction: A tool for understanding the structure of triple stranded left-hand helical cellulose

1989 ◽  
Vol 47 ◽  
pp. 1024-1025
Author(s):  
George C. Ruben ◽  
William Krakow
Keyword(s):  
Single Molecule ◽  
Helical Structure ◽  
Optical Diffraction ◽  
Maximum Diameter ◽  
Primary Cell Wall ◽  
Cellulose Synthesis ◽  
Left Hand ◽  
Left Handed ◽  
Freeze Dried ◽  
Diffraction Patterns

Tobacco primary cell wall and normal bacterial Acetobacter xylinum cellulose formation produced a 36.8±3Å triple-stranded left-hand helical microfibril in freeze-dried Pt-C replicas and in negatively stained preparations for TEM. As three submicrofibril strands exit the wall of Axylinum , they twist together to form a left-hand helical microfibril. This process is driven by the left-hand helical structure of the submicrofibril and by cellulose synthesis. That is, as the submicrofibril is elongating at the wall, it is also being left-hand twisted and twisted together with two other submicrofibrils. The submicrofibril appears to have the dimensions of a nine (l-4)-ß-D-glucan parallel chain crystalline unit whose long, 23Å, and short, 19Å, diagonals form major and minor left-handed axial surface ridges every 36Å.The computer generated optical diffraction of this model and its corresponding image have been compared. The submicrofibril model was used to construct a microfibril model. This model and corresponding microfibril images have also been optically diffracted and comparedIn this paper we compare two less complex microfibril models. The first model (Fig. 1a) is constructed with cylindrical submicrofibrils. The second model (Fig. 2a) is also constructed with three submicrofibrils but with a single 23 Å diagonal, projecting from a rounded cross section and left-hand helically twisted, with a 36Å repeat, similar to the original model (45°±10° crossover angle). The submicrofibrils cross the microfibril axis at roughly a 45°±10° angle, the same crossover angle observed in microflbril TEM images. These models were constructed so that the maximum diameter of the submicrofibrils was 23Å and the overall microfibril diameters were similar to Pt-C coated image diameters of ∼50Å and not the actual diameter of 36.5Å. The methods for computing optical diffraction patterns have been published before.

Left handed GDPs and students

BDJ ◽  
1995 ◽  
Vol 178 (12) ◽  
pp. 448-448 ◽  
Author(s):  
J M Brown
Keyword(s):  
Left Handed

Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20502
Author(s):  
Behrokh Beiranvand ◽  
Alexander S. Sobolev ◽  
Anton V. Kudryashov
Keyword(s):  
Transmission Line ◽  
Terahertz Radiation ◽  
Transmission Lines ◽  
Software Package ◽  
Optical Pulses ◽  
Capacitively Coupled ◽  
Voltage Difference ◽  
Left Handed ◽  
Microwave Transmission ◽  
Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

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