scholarly journals Out-of-plane emission of trions in monolayer WSe2 revealed by whispering gallery modes of dielectric microresonators

2020 ◽  
Author(s):  
Daniel Andres-Penares ◽  
Mojtaba Karimi Hábil ◽  
Alejandro Molina-Sánchez ◽  
Carlos Zapata-Rodríguez ◽  
Juan Martinez-Pastor ◽  
...  
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Close Contact ◽  
Spectroscopic Method ◽  
Whispering Gallery Modes ◽  
Quantum Communications ◽  
Whispering Gallery ◽  
Plane Component ◽  
Out Of Plane ◽  
On Chip

Abstract The manipulation of light emitted by two-dimensional semiconductors grounds forthcoming technologies in the field of on-chip communications. However, these technologies require from the so elusive out-of-plane photon sources to achieve an efficient coupling of radiated light into planar devices. Here we propose a versatile spectroscopic method that enables the identification of the out-of-plane component of dipoles due to the selective coupling of light emitted by in-plane and out-of-plane dipoles to the whispering gallery modes of spherical dielectric microresonators, in close contact to them. We have applied this method to demonstrate the existence of dipoles with an out-of-plane orientation in monolayer WSe2 at room temperature, by means of micro-photoluminescent measurements, numerical simulations based on finite element methods, and ab-initio calculations. Experimental results and ab-initio calculations identify trions as the source responsible for this out-of-plane emission, opening new routes for realizing on-chip integrated systems with applications in information processing and quantum communications.

scholarly journals Out-of-plane trion emission in monolayer WSe2 revealed by whispering gallery modes of dielectric microresonators

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Daniel Andres-Penares ◽  
Mojtaba Karimi Habil ◽  
Alejandro Molina-Sánchez ◽  
Carlos J. Zapata-Rodríguez ◽  
Juan P. Martínez-Pastor ◽  
...  
Keyword(s):  
Room Temperature ◽  
Close Contact ◽  
Spectroscopic Method ◽  
Whispering Gallery Modes ◽  
Quantum Communications ◽  
Whispering Gallery ◽  
Plane Component ◽  
Out Of Plane ◽  
Efficient Coupling ◽  
On Chip

AbstractThe manipulation of light emitted by two-dimensional semiconductors grounds forthcoming technologies in the field of on-chip communications. However, these technologies require from the so elusive out-of-plane photon sources to achieve an efficient coupling of radiated light into planar devices. Here we propose a versatile spectroscopic method that enables the identification of the out-of-plane component of dipoles. The method is based on the selective coupling of light emitted by in-plane and out-of-plane dipoles to the whispering gallery modes of spherical dielectric microresonators, in close contact to them. We have applied this method to demonstrate the existence of dipoles with an out-of-plane orientation in monolayer WSe2 at room temperature. Micro-photoluminescent measurements, numerical simulations based on finite element methods, and ab-initio calculations have identified trions as the source responsible for this out-of-plane emission, opening new routes for realizing on-chip integrated systems with applications in information processing and quantum communications.

Configurational Assignment and Conformational Study of Methylglyoxal Bisdimethylhydrazones Derived from the 2-Ethoxypropenal Precursor

2006 ◽  
Vol 59 (3) ◽  
pp. 211 ◽  
Author(s):  
Leonid B. Krivdin ◽  
Lyudmila I. Larina ◽  
Kirill A. Chernyshev ◽  
Natalia A. Keiko
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Experimental Measurements ◽  
Conformational Study ◽  
Lone Pairs ◽  
Configurational Assignment ◽  
Out Of Plane ◽  
High Level

A configurational assignment of the isomeric methylglyoxal bisdimethylhydrazones derived from the 2-ethoxypropenal precursor has been performed based on experimental measurements and high-level ab initio calculations of 1J(C,C) and 1J(C,H) couplings. The results reveal the marked stereochemical dependence upon the orientation of the lone pairs of both nitrogen atoms in different isomers. Methylglyoxal bisdimethylhydrazone is shown to exist in a mixture of the EE and ZE isomers (ca. 75:25), both of which adopt predominant s-trans conformations with minor (up to 8°) out-of-plane deviations.

scholarly journals Dynamics Studies of Nitrogen Interstitial in GaN from Ab Initio Calculations

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3627
Author(s):  
Huan He ◽  
Wenbo Liu ◽  
Pengbo Zhang ◽  
Wenlong Liao ◽  
Dayin Tong ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Separation Distance ◽  
Semiconductor Materials ◽  
Stable Configuration ◽  
Anisotropic Behavior ◽  
Out Of Plane ◽  
First Time ◽  
Good Agreement

Understanding the properties of defects is crucial to design higher performance semiconductor materials because they influence the electronic and optical properties significantly. Using ab initio calculations, the dynamics properties of nitrogen interstitial in GaN material, including the configuration, migration, and interaction with vacancy were systematically investigated in the present work. By introducing different sites of foreign nitrogen atom, the most stable configuration of nitrogen interstitial was calculated to show a threefold symmetry in each layer and different charge states were characterized, respectively. In the researches of migration, two migration paths, in-plane and out-of-plane, were considered. With regards to the in-plane migration, an intermediated rotation process was observed first time. Due to this rotation behavior, two different barriers were demonstrated to reveal that the migration is an anisotropic behavior. Additionally, charged nitrogen Frenkel pair was found to be a relatively stable defect complex and its well separation distance was about 3.9 Å. Part of our results are in good agreement with the experimental results, and our work provides underlying insights of the identification and dynamics of nitrogen interstitial in GaN material. This study of defects in GaN material is useful to establish a more complete theory and improve the performance of GaN-based devices.

Fast, Slow, Stopping and Storing Light Simultaneously using a PANDA Ring On-Chip

2013 ◽  
Vol 02 (01) ◽  
pp. 37-39 ◽  
Author(s):  
N. Sarapat ◽  
W. Khunnam ◽  
S. Chiangga ◽  
N. Thammawongsa ◽  
M. A. Jalil ◽  
...  
Keyword(s):  
Slow Light ◽  
Research Work ◽  
Microring Resonator ◽  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
On Chip ◽  
Technological University ◽  
University Scientists ◽  
Light Beams ◽  
Molecule Trapping

Past and slow light behaviors are the interesting aspects of light which can be useful for many fundamental and applied researches. Pornsuwancharoen and Yupapin et al. [1] have proposed the use of a simple device called “microring resonator” to perform such behaviors. In this research work, the four different behaviors of light i.e., fast, slow, stopping and storing of light where investigated using a ring resonator. Nowadays, stopping or cooling light beam has become the promising technique for atom/molecule trapping investigations (using static or dynamic tweezers), especially, after the announcement of Nobel Prize 2012 in Physics on the whispering gallery modes [2, 3]. There are two more kinds of devices that can be used to trap light beams, the use of microcavity arrays performed by Yanik and Fan [4], and nonlinear microring resonator by Yupapin and Pornsuwancharoen [5] for stopping light (laser beam). Nanyang Technological University scientists have also done experiment to slowing the light in microresonators using a microring system recently [6]. This concept is a concrete backbone for many applications.

scholarly journals Vortex Laser Based on a Plasmonic Ring Cavity

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 901
Author(s):  
Xingyuan Wang ◽  
Xiaoyong Hu ◽  
Tianrui Zhai
Keyword(s):  
Standing Wave ◽  
Ring Cavity ◽  
Single Mode ◽  
Optical Devices ◽  
Whispering Gallery Modes ◽  
Basic Building Block ◽  
Whispering Gallery ◽  
On Demand ◽  
On Chip ◽  
Structure Light

The orbital angular momentum (OAM) of the structure light is viewed as a candidate for enhancing the capacity of information processing. Microring has advantages in realizing the compact lasers required for on-chip applications. However, as the clockwise and counterclockwise whispering gallery modes (WGM) appear simultaneously, the emitted light from the normal microring does not possess net OAM. Here, we propose an OAM laser based on the standing-wave WGMs containing clockwise and counterclockwise WGM components. Due to the inhomogeneous intensity distribution of the standing-wave WGM, the single-mode lasing for the OAM light can be realized. Besides, the OAM of the emitted light can be designed on demand. The principle and properties of the proposed laser are demonstrated by numerical simulations. This work paves the way for exploring a single-mode OAM laser based on the plasmonic standing-wave WGMs at the microscale, which can be served as a basic building block for on-chip optical devices.

Fine-tuning of whispering gallery modes in on-chip silica microdisk resonators within a full spectral range

2013 ◽  
Vol 102 (4) ◽  
pp. 041104 ◽  
Author(s):  
Rico Henze ◽  
Christoph Pyrlik ◽  
Andreas Thies ◽  
Jonathan M. Ward ◽  
Andreas Wicht ◽  
...  
Keyword(s):  
Spectral Range ◽  
Fine Tuning ◽  
Whispering Gallery Modes ◽  
Whispering Gallery ◽  
Microdisk Resonators ◽  
On Chip
Sign in / Sign up

Export Citation Format

Share Document