Modal properties of semiconductor nanowires for laser applications

2004 ◽  
Author(s):  
Alex V. Maslov ◽  
Cun Zheng Ning
Keyword(s):  
Semiconductor Nanowires ◽  
Laser Applications ◽  
Modal Properties

scholarly journals Nanowire Oligomer Waveguide Modes towards Reduced Lasing Threshold

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5510
Author(s):  
Henrik Mäntynen ◽  
Nicklas Anttu ◽  
Harri Lipsanen
Keyword(s):  
Coating Layer ◽  
Gain Medium ◽  
Semiconductor Nanowires ◽  
Lasing Threshold ◽  
Modal Properties ◽  
Waveguide Modes ◽  
Fabry Perot ◽  
Index Contrast ◽  
Modal Field ◽  
Nanowire Lasers

Semiconductor nanowires offer a promising route of realizing nanolasers for the next generation of chip-scale optoelectronics and photonics applications. Established fabrication methods can produce vertical semiconductor nanowires which can themselves act both as a gain medium and as a Fabry–Pérot cavity for feedback. The lasing threshold in such nanowire lasers is affected by the modal confinement factor and end facet reflectivities, of which the substrate end reflectivity tends to be limited due to small refractive index contrast between the nanowire and substrate. These modal properties, however, also depend strongly on the modal field profiles. In this work, we use numerical simulations to investigate waveguide modes in vertical nanowire oligomers (that is, arrangements of few vertical nanowires close to each other) and their modal properties compared to single nanowire monomers. We solve for the oligomer waveguide eigenmodes which are understood as arising from interaction of monomer modes and further compute the reflectivity of these modes at the end facets of the nanowires. We consider either the nanowires or an additional coating layer as the gain medium. We show that both types of oligomers can exhibit modes with modal properties leading to reduced lasing threshold and also give directions for further research on the topic.

HUMO-LUMO Studies on Methyl Orange Doped ZTS Crystals for Laser Applications

2018 ◽  
Vol 6 (6) ◽  
pp. 362
Author(s):  
G. Suresh ◽  
K. Sambath Kumar ◽  
P. Ambalavanan ◽  
P. Kumaresan
Keyword(s):  
Molecular Electrostatic Potential ◽  
Nbo Analysis ◽  
Inorganic Materials ◽  
Thermo Gravimetric ◽  
Laser Applications ◽  
Charge Delocalization ◽  
Device Applications ◽  
Warming Rate ◽  
The Stability ◽  
Homo Lumo

Zinc Thiourea Sulphate (ZTS), crystal is a magnificent metal natural compound, which consolidates the upsides of both natural and inorganic materials when contrasted and other customary non-linear optical materials and in this way can be utilized as a part of a more extensive scope of uses. Late endeavors at delivering new recurrence transformation materials have concentrated essentially on expanding the extent of the NLO properties that can recurrence twofold low pinnacle control sources, for example, diode lasers.  The thermo gravimetric examination (TGA) and differential warm investigation (DTA) were completed utilizing Seiko warm analyzer at warming rate 20°C/min in air to decide the warm dependability of the compound. ZTS crystals were developed by moderate cooling procedure. This empowers the development of mass gems along all the three bearings at an ideal pH. FTIR examines demonstrate that in the spectra of ZTS there is a move in the recurrence band in the low-recurrence district which uncovers that thiourea shapes sulfur-to-zinc securities in the ZTS crystals. The stability and charge delocalization of the molecule were also studied by natural bond orbital (NBO) analysis. The HOMO-LUMO energies describe the charge transfer takes place within the molecule. Molecular electrostatic potential has been analyzed.  The developments try in extensive scale with this enhanced pH qualities is required to yield mass crystal appropriate for laser combination tests and SHG device applications.

Laser Applications on Orthopaedic Bone Repair

2013 ◽  
Author(s):  
Kotaro Sena ◽  
Amarjit S. Virdi
Keyword(s):  
Bone Repair ◽  
Laser Applications
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