scholarly journals Quantum Signal over Optical Fiber

2021 ◽  
Author(s):  
Nor Roshidah Yusof ◽  
Norshamsuri Ali ◽  
Syed Alwee Aljunid Syed Junid ◽  
Mohd Rashidi Che Beson ◽  
Rosdisham Endut
Keyword(s):  
Lithium Niobate ◽  
Optical Fiber ◽  
Quantum Effect ◽  
Free Particle ◽  
Theoretical Work ◽  
Waveguide Structure ◽  
Attractive Potential ◽  
Quantum Bits ◽  
Nano Fabrication ◽  
Optical Waveguiding

This chapter aims to address the quantum signal role and properties in optical fiber application mainly in quantum communication. It covers the general discussion on quantum bits and optical waveguiding properties. The highlight of this chapter lies in the discussion of the quantum fictitious force of anti-centrifugal force which was first reported in 2001. Under this condition, the free particle experience an attractive potential towards the rotating center of a bent waveguide structure. A lot of theoretical work has been carried out to observe this quantum phenomenon. However, no intensive experimental work has been carried out to date. With the advancement of nano-fabrication technology and quantum experimental, it provides a bright potential to observe these phenomena. Thus, we proposed a promising material of Lithium Niobate on Insulator to serve as a waveguiding platform to study this quantum effect experimentally. The discussion is extended to perceive the relation between Schrodinger and Helmholtz’s equation corresponding to this effect.

Raman Characterization of AlGaAs Superlattice Channel Waveguide Structure formed by CIB and FIB Implantation

1991 ◽  
Vol 240 ◽  
Author(s):  
A. G. Choo ◽  
V. Gupta ◽  
H. E. Jackson ◽  
J. T. Boyd ◽  
A. J. Steckl ◽  
...  
Keyword(s):  
Focused Ion Beam ◽  
Ion Beam ◽  
Waveguide Structure ◽  
Channel Waveguide ◽  
Optical Channel ◽  
Correlation Model ◽  
Lattice Damage ◽  
Optical Waveguiding ◽  
Raman Characterization

ABSTRACTRaman scattering has been used to characterize lattice damage and impurity-induced compositional disordering in AlGaAs superlattice suitable for optical waveguiding. The degree of damage induced by both conventional ion beam (CIB) implantation and focused ion beam (FIB) implantation is studied using a spatial correlation model to interpret the Raman spectra. FIB implantation is found to induce slightly more damage than CIB implantation for doses of 8×1013 cm−2 and 4×1014 cm−2. and significantly more damage with 2×1015 cm2 compared to CIB implantations of the same dose. Suitable FIB implantation and rapid thermal annealing (RTA) conditions which provide compositional mixing were determined using Raman and photoluminescence spectroscopy. Using these conditions, an optical channel waveguide in AlGaAs superlattice formed by FIB-induced compositional intermixing is demonstrated.

scholarly journals On optical transmittance of ultra diluted gas

2020 ◽  
Author(s):  
Jakub Ratajczak
Keyword(s):  
Wave Function ◽  
Quantum Mechanics ◽  
Quantum Effect ◽  
Free Particle ◽  
Optical Transmittance ◽  
Interpretations Of Quantum Mechanics ◽  
Non Locality ◽  
Astrophysical Phenomena

Abstract The paper proposes a model of optical transmittance of ultra diluted gas taking into account gas particles non-locality, the quantum effect of wave function spreading derived from solving the Schr ̈odinger equation for a free particle. A significant increase in the transmittance of such gas is envisaged as compared to the classical predictions. Some quantitative and qualitative consequences of the model are indicated and falsifying experiments are proposed. The classic Beer-Lambert law equation within range of its applicability is derived from the model. Remarks to some astrophysical phenomena and possible interpretations of Quantum Mechanics are made. An experiment consistent with the predictions of this model is referenced.

Scattering, Quantum Current, and Resonant Tunneling

2021 ◽  
pp. 69-81
Author(s):  
Duncan G. Steel
Keyword(s):  
Potential Energy ◽  
Free Particle ◽  
Forward Direction ◽  
One Dimension ◽  
Attractive Potential ◽  
Positive Direction ◽  
Quantum Current ◽  
Potential Energy Term ◽  
The Impact ◽  
Two Barriers

Having examined free particles and particles that are confined in space by a potential energy term, we now consider the impact of a disturbance in the flat energy landscape for a free particle. By disturbance we means some kind of fixed “obstacle” which is either a positive (repelling) or negative (attractive) potential. We are interested in determining the impact on the free particle. Continuing to work mostly in one dimension, the particle described by a plane wave corresponding to momentum moving in the positive direction (a positive k−vector in the x−direction), we study elastic scattering. In one dimension, this means that we determine the probability that the particle is transmitted (continuing in the forward direction) or reflected (now moving in the backward direction.) We will also determine the nature of the solution inside the potential and in the case that the potential energy maximum is greater than the kinetic energy of the particle, we will show that the particle tunnels through the barrier. Interestingly, when we have two barriers, we can find conditions where the probability that the particle is transmitted is unity. This is the result of resonance, a feature of the wave-like nature of the particle’s wave function.

Protein-based nano-structure fabrication in aqueous solution: Bio Nano Process

2013 ◽  
Vol 1436 ◽  
Author(s):  
Ichiro Yamashita
Keyword(s):  
Thin Film ◽  
Aqueous Solution ◽  
Quantum Effect ◽  
Fabrication Process ◽  
Self Organization ◽  
Nanostructure Fabrication ◽  
Nano Structure ◽  
Nano Fabrication ◽  
Wide Range ◽  
Thin Film Devices

ABSTRACTA new nano-fabrication process, utilizing protein supramolecules, biomineralization, and nano-etching was proposed, which was named Bio Nano Process (BNP). The main processes of the BNP include the nanoparticle (NP) or nanowire (NW) synthesis utilizing bio-template (biomineralization) and nanostructure fabrication utilizing self-organization of protein supramolecules. Proteins are so designed to produce the final structures. The space where nano functional structures are fabricated is named an “Active Bio-field”. It was proven that the process has vast potential to be applied to a wide range of quantum effect base nano-devices and thin film devices.

Design, Fabrication and Testing of a Dual-Band Photoacoustic Transducer

2008 ◽  
Vol 30 (4) ◽  
pp. 217-227 ◽  
Author(s):  
Jian-Hung Liu ◽  
Chen-Wei Wei ◽  
Yae-Lin Sheu ◽  
Yu-Tsung Tasi ◽  
Yu-Hsin Wang ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Optical Fiber ◽  
Multimodality Imaging ◽  
Performance Characteristics ◽  
Acoustic Properties ◽  
Dual Band ◽  
Imaging Methods ◽  
Phantom Imaging ◽  
Pulse Echo ◽  
Imaging Setup

Combining photoacoustic and ultrasonic imaging allows both optical and acoustic properties to be displayed simultaneously. In this paper, we describe a dual-band transducer for implementing such a multimodality imaging setup. The transducer exhibits two frequency bands so that it matches the frequency of interest in both imaging methods. An optical fiber is included in the center so that it is inherently coregistered. The transducer was fabricated from lithium niobate and comprises two concentric rings whose center frequencies are 4.9 MHz and 14.8 MHz. Pulse-echo measurements and phantom imaging were performed to demonstrate its performance characteristics.

Lithium niobate nanoparticle-coated Y-coupler optical fiber for enhanced electro-optic sensitivity

2015 ◽  
Vol 40 (4) ◽  
pp. 491 ◽  
Author(s):  
Ch. N. Rao ◽  
S. B. Sagar ◽  
N. G. Harshitha ◽  
Radhamanohar Aepuru ◽  
S. Premkumar ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Optical Fiber ◽  
Electro Optic

TRAPPING COLD ATOMS BY A CARBON NANOTUBE

2011 ◽  
Vol 25 (12n13) ◽  
pp. 979-985 ◽  
Author(s):  
T. A. CHU ◽  
D. T. NGA ◽  
T. T. THAO ◽  
V. THANH NGO ◽  
N. A. VIET
Keyword(s):  
Electromagnetic Field ◽  
Carbon Nanotube ◽  
Optical Fiber ◽  
Boundary Conditions ◽  
Evanescent Wave ◽  
Cold Atoms ◽  
Cold Atom ◽  
Bound State ◽  
Attractive Potential ◽  
Bound State Solution

A new model of cold atoms trap using a carbon nanotube is proposed. In this model, for the existence of a stable bound state of cold atom, we send a strong electromagnetic field through the carbon nanotube. This field generates an evanescent wave around the carbon nanotube and creates an effective attractive potential. The consideration of some possible boundary conditions leads to this non-trivial bound state solution. We compare also our result to the two most recent models concerning trapping of cold atoms by using a charged carbon nanotube and an optical fiber.

scholarly journals Electro-Optic Materials by Solid Source MOCVD

1993 ◽  
Vol 335 ◽  
Author(s):  
R. Hiskes ◽  
S. A. Dicarolis ◽  
J. Fouquet ◽  
Z. Lu ◽  
R. S. Feigelson ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Field Measurements ◽  
Potassium Niobate ◽  
Strontium Barium Niobate ◽  
Strontium Barium ◽  
Rocking Curve ◽  
X Ray ◽  
Electro Optic ◽  
Electric Field Measurements ◽  
Optical Waveguiding

AbstractThe solid source MOCVD technique1,2, employing a single powder vaporization source composed of mixed beta-diketonate metalorganic compounds, has been used to grow thin films of a variety of electro-optic materials, including lithium niobate, strontium barium niobate, and potassium niobate. Results for potassium niobate films are quite preliminary, but indicate that a volatile potassium organometallic source can be synthesized which is useful for growing potassium niobate by MOCVD. High quality single phase (001) oriented strontium barium niobate films have been deposited which exhibit waveguiding behavior. The most extensive work has been done on lithium niobate, which has been deposited epitaxially on a variety of substrates. Oriented z-axis (001) films have been grown on c-axis sapphire with and without a (111) oriented platinum base electrode and on a bulk grown lithium niobate substrate. Films grown directly on c-axis sapphire at 700 C exhibit x-ray rocking curve linewidths as low as.044 degrees, nearly perfect in-plane orientation as determined by x-ray phi scans, and peak-to-peak surface roughness less than 40 Å. Optical waveguiding has been demonstrated by a single prism coupling technique on similar films 1175 – 2000 Å thick grown at 500 C, with optical losses of approximately 2 db/cm at 632.8 nm measured over 3.5 cm long films. Polarization vs. electric field measurements on 1100 Å thick films grown on platinum show a hysteresis loop indicating ferroelectric behavior.

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