<title>Optical design and optimization of a high-performance laser printhead</title>

In the design engineering of high performance electromagnetic lenses, the direct conversion of electron optical design data into drawings for reliable hardware is oftentimes difficult, especially in terms of how to mount parts to each other, how to tolerance dimensions, and how to specify finishes. An answer to this is in the use of magnetostatic analytics, corresponding to boundary conditions for the optical design. With such models, the magnetostatic force on a test pole along the axis may be examined, and in this way one may obtain priority listings for holding dimensions, relieving stresses, etc..The development of magnetostatic models most easily proceeds from the derivation of scalar potentials of separate geometric elements. These potentials can then be conbined at will because of the superposition characteristic of conservative force fields.

Download Full-text

High-Performance Ultra-Thin Spectrometer Optical Design Based on Coddington’s Equations

Sensors ◽

10.3390/s21020323 ◽

2021 ◽

Vol 21 (2) ◽

pp. 323

Author(s):

Zhiwei Feng ◽

Guo Xia ◽

Rongsheng Lu ◽

Xiaobo Cai ◽

Hao Cui ◽

...

Keyword(s):

High Resolution ◽

Spectral Resolution ◽

High Performance ◽

Optical Design ◽

Pixel Size ◽

Simulation Design ◽

Central Wavelength ◽

Spot Radius ◽

Unique Method ◽

Almost All

A unique method to design a high-throughput and high-resolution ultrathin Czerny–Turner (UTCT) spectrometer is proposed. This paper reveals an infrequent design process of spectrometers based on Coddington’s equations, which will lead us to develop a high-performance spectrometer from scratch. The spectrometer is composed of cylindrical elements except a planar grating. In the simulation design, spot radius is sub-pixel size, which means that almost all of the energy is collected by the detector. The spectral resolution is 0.4 nm at central wavelength and 0.75 nm at edge wavelength when the width of slit is chosen to be 25 μm and the groove density is 900 lines/mm.

Download Full-text

Mechanism of the Transition From In-Plane Buckling to Helical Buckling for a Stiff Nanowire on an Elastomeric Substrate

Journal of Applied Mechanics ◽

10.1115/1.4032573 ◽

2016 ◽

Vol 83 (4) ◽

Cited By ~ 17

Author(s):

Youlong Chen ◽

Yong Zhu ◽

Xi Chen ◽

Yilun Liu

Keyword(s):

High Performance ◽

Three Dimensional ◽

Stretchable Electronics ◽

Buckling Mode ◽

Design And Optimization ◽

Out Of Plane ◽

Plane Direction ◽

Plane Displacement ◽

Helical Buckling ◽

Selection Of

In this work, the compressive buckling of a nanowire partially bonded to an elastomeric substrate is studied via finite-element method (FEM) simulations and experiments. The buckling profile of the nanowire can be divided into three regimes, i.e., the in-plane buckling, the disordered buckling in the out-of-plane direction, and the helical buckling, depending on the constraint density between the nanowire and the substrate. The selection of the buckling mode depends on the ratio d/h, where d is the distance between adjacent constraint points and h is the helical buckling spacing of a perfectly bonded nanowire. For d/h > 0.5, buckling is in-plane with wavelength λ = 2d. For 0.27 < d/h < 0.5, buckling is disordered with irregular out-of-plane displacement. While, for d/h < 0.27, buckling is helical and the buckling spacing gradually approaches to the theoretical value of a perfectly bonded nanowire. Generally, the in-plane buckling induces smaller strain in the nanowire, but consumes the largest space. Whereas the helical mode induces moderate strain in the nanowire, but takes the smallest space. The study may shed useful insights on the design and optimization of high-performance stretchable electronics and three-dimensional complex nanostructures.

Download Full-text

Optical design and optimization study of metrology sector at high energy photon source

Radiation Detection Technology and Methods ◽

10.1007/s41605-021-00241-0 ◽

2021 ◽

Author(s):

Xiaojuan Zhao ◽

Yidong Zhao ◽

Lei Zheng ◽

Kun Tang ◽

Shuhu Liu ◽

...

Keyword(s):

Optical Design ◽

High Energy ◽

High Energy Photon ◽

Energy Photon ◽

Design And Optimization ◽

Optimization Study ◽

Photon Source

Download Full-text

Defect Engineering in 2D Materials: Precise Manipulation and Improved Functionalities

Research ◽

10.34133/2019/4641739 ◽

2019 ◽

Vol 2019 ◽

pp. 1-14 ◽

Cited By ~ 10

Author(s):

Jie Jiang ◽

Tao Xu ◽

Junpeng Lu ◽

Litao Sun ◽

Zhenhua Ni

Keyword(s):

High Performance ◽

2D Materials ◽

Optoelectronic Devices ◽

Deep Understanding ◽

Building Blocks ◽

Research Progress ◽

Defect Engineering ◽

Plasma Chemical ◽

Design And Optimization ◽

Novel Structure

Two-dimensional (2D) materials have attracted increasing interests in the last decade. The ultrathin feature of 2D materials makes them promising building blocks for next-generation electronic and optoelectronic devices. With reducing dimensionality from 3D to 2D, the inevitable defects will play more important roles in determining the properties of materials. In order to maximize the functionality of 2D materials, deep understanding and precise manipulation of the defects are indispensable. In the recent years, increasing research efforts have been made on the observation, understanding, manipulation, and control of defects in 2D materials. Here, we summarize the recent research progress of defect engineering on 2D materials. The defect engineering triggered by electron beam (e-beam), plasma, chemical treatment, and so forth is comprehensively reviewed. Firstly, e-beam irradiation-induced defect evolution, structural transformation, and novel structure fabrication are introduced. With the assistance of a high-resolution electron microscope, the dynamics of defect engineering can be visualized in situ. Subsequently, defect engineering employed to improve the performance of 2D devices by means of other methods of plasma, chemical, and ozone treatments is reviewed. At last, the challenges and opportunities of defect engineering on promoting the development of 2D materials are discussed. Through this review, we aim to build a correlation between defects and properties of 2D materials to support the design and optimization of high-performance electronic and optoelectronic devices.

Download Full-text

Optical design of high performance con-focal microscopy with digital micro-mirror and stray light filters

Optik ◽

10.1016/j.ijleo.2009.07.010 ◽

2010 ◽

Vol 121 (22) ◽

pp. 2073-2079 ◽

Cited By ~ 5

Author(s):

Chuan-Cheng Hung ◽

Yi-Chin Fang ◽

Cheng-Mu Tsai ◽

Chang-Ching Lin ◽

Koung-Ming Yeh ◽

...

Keyword(s):

High Performance ◽

Optical Design ◽

Stray Light ◽

Light Filters

Download Full-text

Self-Screening of the polarized electric field in Wurtzite Gallium Nitride along [0001] direction

Chinese Physics B ◽

10.1088/1674-1056/ac4746 ◽

2021 ◽

Author(s):

Qiu-Ling Qiu ◽

Shi-Xu Yang ◽

Qian-Shu Wu ◽

Cheng-Lang Li ◽

Qi Zhang ◽

...

Keyword(s):

Electric Field ◽

Computer Aided Design ◽

High Performance ◽

High Electron Mobility Transistors ◽

High Electron ◽

Screening Effect ◽

White Leds ◽

Design And Optimization ◽

Electron Mobility Transistors ◽

Dimensional Electron Gas

Abstract The strong polarization effect of GaN-based materials is widely used in high-performance devices such as white-light-emitting diodes (white LEDs), high electron mobility transistors (HEMTs) and GaN Polarization SuperJunctions. However, the current researches on the polarization mechanism of GaN-based materials are not sufficient. In this paper, we studied the influence of polarization on electric field and energy band characteristics of Ga-face GaN bulk materials by using a combination of theoretical analysis and semiconductor technology computer-aided design (TCAD) simulation. The self-screening effect in Ga-face bulk GaN under ideal and non-ideal conditions is studied respectively. We believe that the formation of high-density two-dimensional electron gas (2DEG) in GaN is the accumulation of screening charges. So that, we also clarify the source and accumulation of the screening charges caused by the GaN self-screening effect in this paper and aim to guide the design and optimization of high-performance GaN-based devices.

Download Full-text

Design and Optimization of an Integrated Turbo-Generator and Thermoelectric Generator for Vehicle Exhaust Electrical Energy Recovery

Energies ◽

10.3390/en12163134 ◽

2019 ◽

Vol 12 (16) ◽

pp. 3134 ◽

Cited By ~ 3

Author(s):

Prasert Nonthakarn ◽

Mongkol Ekpanyapong ◽

Udomkiat Nontakaew ◽

Erik Bohez

Keyword(s):

Diesel Engines ◽

High Performance ◽

Thermoelectric Generator ◽

Waste Heat ◽

Electrical Energy ◽

Vehicle Exhaust ◽

Gasoline Engines ◽

Design And Optimization ◽

Charging Station ◽

Turbo Generator

The performance of turbo-generators significantly depends on the design of the power turbine. In addition, the thermoelectric generator can convert waste heat into another source of energy. This research aims to design and optimize an integrated turbo-generator and thermoelectric generator for diesel engines. The goal is to generate electricity from the vehicle exhaust gas. Electrical energy is derived from generators using the flow, pressure, and temperature of exhaust gases from combustion engines and heat-waste. In the case of turbo-generators and thermoelectric generators, the system automatically adjusts the power provided by an inverter. Typically, vehicle exhausts are discarded to the environment. Hence, the proposed conversion to electrical energy will reduce the alternator charging system. This work focuses on design optimization of a turbo-generator and thermoelectric generator for 2500 cc. diesel engines, due to their widespread usage. The concept, however, can also be applied to gasoline engines. Moreover, this model is designed for a hybrid vehicle. Charging during running will save time at the charging station. The optimization by variable van angles of 40°, 50°, 62°, 70°, and 80° shows that the best output power is 62°, which is identical to that calculated. The maximum power outputted from the designed prototype was 1262 watts when operating with an exhaust mass flow rate of 0.1024 kg/s at 3400 rpm (high performance of the engine). This research aims to reduce fuel consumption and reduce pollution from the exhaust, especially for hybrid vehicles.

Download Full-text