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Compared to the almost magical impact of lasers and photonics on our lives, from the Internet to supermarket checkouts, mechanical systems can seem almost quaint. Yet one of the surprises of nonlinear optics — the field of optics with high intensity lasers — is that light may interact strongly with sound, the most mundane of mechanical vibrations. Intense laser light literally “shakes” the glass in...
Two dimensional model of graphene silicon heterojunction solar cell with an boron doped surface layer is structured using Silvaco TCAD tools by accurate control of diffusion process. The introduction of inverse doped layer obviously improved the efficiency of heterojunction photovoltaic cell.
Simulation studies targeting high-power narrow-linewidth emission from DFB lasers are presented. The linewidth and output power calculations take into account the mirror losses, including the grating and the facets, as well as spontaneous emission noise, effective refractive index, power and carrier density variations inside the cavity. The longitudinal power and carrier density distributions have...
The paper establishes a low temperature model based on the least square method. The Matlab software is used to fit the I-V curves. Some I-V response can be got through the model without low temperature test. Testing data have been validated by using the model and the fitting degree is rather highly.
In order to implement laser generation of acoustic waves in liquid efficiently, the optical-acoustic conversion efficiency was calculated and its influenced factors were analyzed, such as, time-domain power distribution, peak power density and pulse width of laser, and optical absorption coefficient of fluid medium. The theoretical analysis shows that: the larger the peak power density is, the larger...
The GaN-based green lasers play an important role in optoelectronic innovation. Multi quantum wells and quantum dots within a quantum well have been characterized. The polarization, effective mass, subbands and optical gain have been taken into account. The rigorous k·p-method with Hamiltonian (8 by 8) is applied. The electrical and optical efffect have also been compared in order to reach optimal...
In this paper, We not only developed Poisson and drift-diffusion solver with effective tail states and field-dependent mobility, but set up a 2D random model to treat the doping effect on the organic materials. Understanding these models helps us in modeling OLED.
The operation of multi-quantum well LEDs is determined by the carrier flow through complex, extended quantum states, the optical recombination between these states and the optical fields in the device. Non-equilibrium Green Function Formalism (NEGF) is the state-of-the-art approach for quantum transport, however when it is applied in its textbook form it is numerically too demanding to handle realistically...
An effective strategy to avoid the Ag antioxidized problem of the ultra-narrow dualband plasmonic sensors was proposed and demonstrated theoretically by introducing a thin MgF2 layer above the upmost Ag grating surface. The two peaks have different response to the refractive index of the surrounding medium. The resonant wavelength of the sensor is easily tunable via geometrical scaling of the sensor...
A three-dimensional (3D) stub-type plasmonic filter is analyzed using the FDTD method based on the trapezoidal recursive convolution technique. The peak transmissivity of the 3D filter is calculated to be ≃50%, while the two-dimensional filter yields more than 90% transmissivity. To improve the transmissivity of the 3D filter, we insert a dielectric material into the stub section. It is found that...
We introduce an open-access online database containing high density datasets from various nonlinear laser systems as a resource for facilitating comparisons between theory and experiment, and for answering new research questions. The database is also useful in data science and machine learning.
A simple method for the computation of carrier concentration in n-type doped CdxHg1−xTe structures is proposed. The method is based on the postulate on the existence of donor bands. In our model the donor bands are postulated to have a Gaussian distribution of density of states characterized by two parameters only (energy being the centre of gravity for this distribution and standard deviation). These...
Current injection into single quantum dots embedded in vertical pn-diodes featuring oxide apertures is essential to the technological realization of single-photon sources. This requires efficient electrical pumping of sub-micron sized regions under pulsed excitation to achieve control of the carrier population of the desired quantum dots. We show experimental and theoretical evidence for a rapid lateral...
The high refractive index of III-V semiconductors results in strong waveguiding of light in nanowires, despite their small cross-section dimensions. We will discuss how these waveguiding properties can be used to design nanowire lasers and solar cells with functionalities not possible in conventional, planar devices.
Nobel laureate Shuji Nakamura predicted in 2014 that GaN-based laser diodes are the future of solid state lighting. However, blue GaN-lasers still exhibit less than 40% power conversion efficiency, while GaN-based blue light-emitting diodes reach up to 84% This paper investigates non-thermal reasons behind this difference by comparative numerical device simulation. Fundamental material properties...
We present an analysis of a single photon detector system capable of achieving near-unity detection efficiency. It consist of waveguide-coupled superconducting nanowires as short as 1 μm embedded in a racetrack resonator.
In this paper, a numerical program for simulating the organic/inorganic hybrid solar cells is developed first by including the tail/interfacial states for carrier transport of the organic materials. Then a typical structure of the PEDOT:PSS/Si nanowire hybrid solar cell is simulated and compared with experimental results. Finally, an efficiency up to 14% is obtained after the optimization.
Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
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