t****g
发帖数: 35582 | 1 我不懂这个呀，但是我们公司估计有人感兴趣，他们要做diode laser的waveguide
structure。
你有tech support不？ |
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x5
发帖数: 27871 | 2 Suspended Si Waveguide + 1D PBG? |
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x5
发帖数: 27871 | 3 一层还好吧，其实SOI的工艺还是挺成熟的
Nitride就说不准了，看长膜的工艺了，特别是做waveguide的话是厚膜，没事退退火吧
Ted pella有卖现成的tree-standing Nitride window，厚度可以选，你可以弄来练手 |
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p****r
发帖数: 6 | 4 我今年12月EE PhD毕业，正在找跟半导体或光学器件的工作，有semiconductor
fabrication，photovoltaic和optical waveguide相关经验。
请问各位师兄师姐有opening的能不能refer下工作，十分感谢。 |
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b********t
发帖数: 10 | 5 我想知道190多篇是怎么写出来的?
刚查了他的文章, 有好多, 感觉是他这么多年就没有停过发文章. 那
个朱振海是他的学生吧.
下面是他的文章列表, 也算是体现一下咱的科学精神. 六篇IEEE
Transactions, 共34篇.
Wang J, Yin L, Hong W
Accurate optimization design of millimeter wave diplexers
J INFRARED MILLIM W 19: (4) 297-301 AUG 2000
Shao ZH, Hong W, Zhou JY
A generalized theory on the penetrating boundary conditions
SCI CHINA SER E 43: (3) 275-281 JUN 2000
Yin L, Qian ZP, Hong W, et al.
The application of genetic algorithm in E-plane waveguide
filter design
INT J INFRARED MILLI 21: (2) |
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k**t
发帖数: 1108 | 6 实验室一个阿拉伯家伙整天折腾 2.4 GHz 的 waveguide，没有保护措施
提醒过他这样可能不安全，虽然我不是这个方向的，没概念。 |
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p*l
发帖数: 1359 | 7 成像上他们应该用的不是confocal。confocal对单分子探测有点够呛。我印象里就是个wide field microscope，用EMCCD成像。
所谓zero-mode waveguides，就是激发光只可能在这个纳米大小的小孔内有，漏不出去。所以只有进入了这个小孔的荧分子才可能发光，其他在溶液里的荧光分子，根本不会有信号。成像上不需要考虑背景信号问题，一般的wide field fluorescence就可以了。
SMRT |
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b*********8
发帖数: 97 | 8 Fang, Y. (2010). "Probing Cancer Signaling with Resonant Waveguide Grating
Biosensors." Expert Opin Drug Discov 5(12): 1237-1248.
email: j***[email protected]
跪谢! |
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d*****n
发帖数: 76 | 9 【作者】Y. Enami1, C. T. Derose1, D. Mathine1, C. Loychik1, C. Greenlee1, R.
A. Norwood1, T. D. Kim2, J. Luo2, Y. Tian2, A. K.-Y. Jen2 & N.
Peyghambarian
【文题】Hybrid polymer/sol–gel waveguide modulators with exceptionally
large electro–optic coefficients
【期刊名，年份，卷（期），起止页码】Nature Photonics 1, 180 - 185 (2007)
【全文链接】 http://www.nature.com/nphoton/journal/v1/n3/abs/nphoton.2007.25.html
【求助者联系方式】h********[email protected]
帮国内的同学求的，非常的感谢！！ |
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s*******g
发帖数: 52 | 12 Thank you very much!
1. Formation of Nanofibers from Pure and Mixed Waste Streams Using
Electrospinning, Ind. Eng. Chem. Res., 2015, 54 (37), pp 9057–9063
2.Effect of viscosity of polyvinyl alcohol solution on morphology of the
electrospun mullite nanofibres, Ceramics International Volume 40,Issue 4,
May 2014, Pages 5461–5466
3.Bright Light Emission and Waveguiding in Conjugated Polymer Nanofibers
Electrospun from Organic Salt Added Solutions, Macromolecules, 2013, 46 (15)
, pp 5935–5942 |
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s*s
发帖数: 6 | 13
找
We applied this method to determine the cutoff mode of a dielectric waveguide.
You can find it in some traditional electromagnetic books. |
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H*****l
发帖数: 702 | 14 哥哥
光电 chinese fresh Phd有多少戏？
老实搞silicon
silicon photonics当然没戏
基本扯淡。。。。现在几个大组号称silicon photonics,其实silicon modulator,
silicon waveguide,passive 的哈
真正active的没有
还有号称作silicon photonics,结果搞了一个bio safety level 2/3的lab
当人民群众是 傻子。。。 |
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c******k
发帖数: 1140 | 15 我们制作了一个Photonic Chip with size 1mm x 1mm，上面有3个半导体光放大器（
SOA）和一些无源waveguide device,SOA需要接电流， 它的p type镀有Ti/Pt/Au 电极
，chip背面是N type, 镀有Ni/Au 的薄模。
现在要设计一个Submount，就是为了给SOA供电，自己对这种Submount不太懂，是这样
设计的：一片PCB的上面分割成两个单独的区域，A区域是是接正电极，B区域接负电极
。正电极和chip的p type连接用 wire bonding的方式，那chip的N type 如何连接PCB
的负电极？用什么导电胶来粘，还是怎么办？
另外，我的这种Submount设计对吗，似乎google不到相关的资料。谢谢建议 |
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c******k
发帖数: 1140 | 16 自己制作的半导体光放大器，用的那种multi-QW 的InP的材料，作个ridge waveguide,
波导长度~800um.发现奇怪的是加几个mA电流，都有光发出来。本来是用来做成光放大
器的，现在有光出来，就不好了。
查了商业的半导体光放大器，典型的工作电流都在500mA, 我做的怎么加几个mA 就出光
了？要命的是就想让它有放大作用，不能出光啊，难道增加偏置电流会确会使半导体光
放大器变成一个light source？ 谢谢解惑！ |
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j****n
发帖数: 3465 | 17 首先检查一下绝缘层SiO2质量，有可能SiO2层绝缘性能不够造成漏电；其次，也许在开
SiO2窗口那一步控制得不好，造成窗口过大，偏置电流从侧向加载进去了；再者，仔细
检查一下Electrode Pad及其附近区域是否有漏电现象。
另外，SOA其实从其增益原理上讲，与FP激光器并无区别，只不过采用镀膜手段抑制了
光反馈效应，从而抑制了lasing。
从你叙述的现象来看，基本可以肯定所产生的光是荧光，不会有几个mA就能激射的情况
。你有没有测过产生的光功率是多大？
waveguide, |
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c******k
发帖数: 1140 | 18 请帮忙做个题：看似简单，但不知怎么做
InP Fabry-Perot 激光器的 L-I curves （见图）, 有三个不同的阈值电流，对应三个
不同的cavity lengths：150um, 300um, and 600um.
其他条件： 激光器发射1.55um的光, confinement factor:0.3,
an effective index of InP: n=3.2, a device width of 2um,
an active region thickness of 200nm,
a bimolecular recombination coefficient of B=10^-10 cm^3/s.
请帮忙估计一下internal waveguide loss。或者给点指点，怎么算， 多谢了！！！ |
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c******k
发帖数: 1140 | 19 制作了一个长条 ridge waveguide 的Fabry-Perot laser,这个长条一共有三段波导可
以加driving bias,分别是波导1（270um）,中间波导（500um），波导3 (270um).
单独给波导1 或者 中间波导加current, 或者给波导1＋中间波导加current, 他们的激
射波长有很大的不同，不太懂FP laser, 怎么理解这一实验现象,请熟悉的朋友讲讲激
射波长跟其他参数的关系？ 谢谢! |
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R****a
发帖数: 199 | 20 What happens if you inject current to all three contacts?
Also, you made the laser or you buy/get it from somewhere else?
A schematic drawing of your laser might also be helpful (including the
waveguide structure and material).
1574nm)
this
bigger |
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c******k
发帖数: 1140 | 21 Thank you for your interest.
1.To keep the same current density on the waveguide, the bias current for
the middle contact is always 1.8 times larger than that of the contact 1 and
contact 3. If I inject current for all three contacts, the center lasing
wavelength would be around 1546nm. See the attached picture.
2.We made this FP laser on our own with a pretty standard procedure, and the
commercial available substrate is InP with 6 AlGaInAs quantum wells (Well:
6nm Al0.27GaIn0.71As Barrier: 10n |
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g**h
发帖数: 15 | 22 Don't know if the issue solved or not. But here are my 2 cents.
You also need to consider the heating effect. I noticed that the driving
current is so different: injection with all regions 20mA, region2 80mA, and
region3 120mA. 20mA is the pretty standard for this type of laser.
When you only inject current into certain region of your laser waveguide,
the other region becomes absorber, and force you to inject more current into
it to get enough gain. If no temperature effect, the more current you |
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j****n
发帖数: 3465 | 23 嗯，process工艺是不难，feature size都暴大，远远超出你我做waveguide的人的想象
，呵呵。不过packeging还是有一定讲究的 |
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c******k
发帖数: 1140 | 24 由于我们本来是想制作一个半导体光放大器的，但是出来laser bar 以后，由于
waveguide facet 镀膜及加工7度角成本较大，就没作。如果没做这些处理的话，出来
的是一个标准的FP laser diode。这个laser diode 在30mA 就发激光@1540nm
wavelength.
请问：在加电流小于30mA时，这个laser diode 能用作semiconductor optical
amplifier吗？自己简单测了一下，好像不能放大光在1540nm.但不清楚为甚么？还是我
的测量有问题？ 谢谢！！ |
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m*******r
发帖数: 16 | 25 It can be called SOA below thrshold. But the fiber-to-fiber gain might be too small (cannot compensate your loss due to the fiber coupling etc). You coupling loss depends on your alignment, waveguide structure, fiber type etc, could be more than 6 dB easily.
AR coating should be about $1000 per run. |
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c******k
发帖数: 1140 | 26 我就是用那种精密 XYZ positioner 将fiber的光耦合进FP waveguide, 然后用fiber
把输出光再耦合出来。
NND，看不到回帖。还得去家页，咋整的，这BBS＃￥％……※……※×，整天抽风 |
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c******k
发帖数: 1140 | 27 是的，感觉fiber-to-fiber gain太低，或者几乎没有。
也就是说FP laser diode还是不能作为有效的SOA用。
请问：什么公司肯接这种AR coating 的活？多谢！
too small (cannot compensate your loss due to the fiber coupling etc). You
coupling loss depends on your alignment, waveguide structure, fiber type etc
, could be more than 6 dB easily. |
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a*****e
发帖数: 4577 | 28 原来学过物理的电动力学，但是对于
waveguide, scattering, radiation 这些和EE联系紧密的一块不是很熟
不知道有没有什么Online的书可以推荐？
最好是讲picture讲的比较好的，不是那种除了公式啥都没有的EM书 |
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c********n
发帖数: 258 | 29 谢谢.
HFSS的manual里面是这么写的:
HFSS assumes that each wave port you define is connected to a semi-
infinitely long waveguide that has the same cross-section and material
properties as the port. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~~~~~~~~~~~~~~~~~~~~
When solving for the S-parameters, HFSS assumes that the structure is
excited bythe natural field patterns (modes) associated with these cross-
sections. The 2D field solutions generated for each wave port serve as
boundary conditions at |
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c******k
发帖数: 1140 | 30 请问run 这个slab waveguide 的slab mode时的slab宽度设置多少合适？
不同的slab宽度的1st order slab mode的Neff 还不一样啊，
比如现在设成
20um width: Neff=3.363936（1st order slab mode）
10um width: Neff=3.363858（1st order slab mode）
Nref |
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c******k
发帖数: 1140 | 31 You help me a lot! Two more questions:
1.The calculated Neff of a 0th slab mode with various widths as follows:
1.6um: 3.364379
10um: 3.363858
20um: 3.363936
50um: 3.364155
100um: 3.364166
You suggest me to choose a slab width that is close to a real situation.But
in fact we can consider the slab width to go infinite.So right now I have to
choose Neff with 3.364 as an average value. Any comments about this value?
2. If I keep other parameters same for a ridge waveguide, but just change a
ridg |
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c******k
发帖数: 1140 | 32 Another thing in Rsoft BeamProp simulation that really bother me is how to
choose right compute step sizes for XYZ directions.
For example, to calculate the Neff of 0th order mode in a slad waveguide,
say 15um slab width, keeping a same X domain as -50um~50um for all the cases
. 0.05 step size will have Neff=3.360727, and 0.02 step size will produce 3.
363853, and 0.01 size will lead to 3.364009. Smaller compute size will
always have a better accurate result?? But take too much time.
Could you |
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c***u
发帖数: 843 | 33 现在有一个coplanar waveguide (CPW)，想把他的characteristic impedance做的比较
高（slightly
higher than 50 ohms），尽量minimize conductor loss,所以得把signal和ground之
间的间距做的比
较大，但是因为我们用来测量cpw的picoprobe的pitch比较小，所以在cpw的两端必须要
把这个间距降
低。但是降低间距的话，characteristic impedance就会降低，这样和probe之间就有
了一个
impedance mismatch。
大牛们觉得怎么在减小cpw间距的同时minimize loss？？简单的用一个linear taper可
以吗？
或者有什么文章可以推荐看看的？ 万分感谢！！！ |
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w****j
发帖数: 237 | 35 定本microwave journal或者RF Microwave Magazine,看看里面的广告？ |
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y***q
发帖数: 98 | 36 Job Title: Research Assistant (Post Doctoral Fellow)
Department: Institute of Nanoscale of Material Science and Engineering /
Nano
Annual Salary: Salary will be commensurate with experience and education
.
Description: A research assistant (Post Doctoral Fellow) position is ava
ilable at the Institute of Nanoscale of Material Science and Engineering
and the Department of Electrical Engineering to develop novel semicondu
ctor optoelectronics devices such as lasers and detectors and high frequ
en... 阅读全帖 |
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b*********r
发帖数: 33 | 37 if you have hand on experience on Microwave transceiver, waveguide diplexer,
IF band board, system, there is a very good opportunity, got funding for a
start up, very early stage, if you have interest, please contact me: future_
[email protected], include description or resume. |
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Z*I
发帖数: 397 | 38 2012新上的fellow
清华4，交大2，东南2，中科院1
Zhenghe Feng 冯正和
Tsinghua University
Beijing, China
for contributions to smart antennas and mobile communications, and for
leadership in microwave and antenna education
Zhisheng Niu 牛志升
Tsinghua University
Beijing, China
for contributions to collaborative radio resource management in wireless
network
Jiangtao Wen 温江涛
Tsinghua University
Beijing, China
for contributions to multimedia communication technology and standards
Jianping Wu 吴建平
Tsinghua University
Beijing,... 阅读全帖 |
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p********3
发帖数: 853 | 39 前两天有人发过类似的， 我在英国读的silicon photonics的PhD， 个人感觉光做一个
waveguide的project以后找工作还是很辛苦的。说实话， 在英国我目前还没有找到可
以接口的找industry工作的方向， 唯一能做的是process engineering。 美国估计能
好点， 应该会有start up company出现， 还守着硅谷， 应该可以在未来几年雇一批
人。 最好是有点CMOS background， silicon photonics就是CMOS的延续， 基础很重
要啊！ |
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m****k
发帖数: 637 | 40 支持VDI
你有多传统啊？Waveguide， Microstrip， No active devices？ |
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c*********8
发帖数: 75 | 42 同求，跟楼主背景差不多，本人偏waveguide, resonator些。
, |
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y**********9
发帖数: 566 | 43 谢谢大家，有包子送。我的电子邮件地址是[email protected]
(function(){try{var s,a,i,j,r,c,l,b=document.getElementsByTagName("script");l=b[b.length-1].previousSibling;a=l.getAttribute('data-cfemail');if(a){s='';r=parseInt(a.substr(0,2),16);for(j=2;a.length-j;j+=2){c=parseInt(a.substr(j,2),16)^r;s+=String.fromCharCode(c);}s=document.createTextNode(s);l.parentNode.replaceChild(s,l);}}catch(e){}})();
/* ]]> */
DPSK Data Quality Dependencies in a Microring-Based Transmitter and Receiver
L Zhang, Y Li, M Song, RG Beausole... 阅读全帖 |
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c***u
发帖数: 843 | 44 power switching transistor是做silicon的吗？ |
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z********7
发帖数: 57 | 45 material is GaN-on-bulk GaN, structure is vertical transistor |
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s*****t
发帖数: 15 | 47 optical waveguide lightmode spectrometry |
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y***e
发帖数: 6082 | 48 能介绍12么，不懂
optical waveguide lightmode spectrometry |
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z********m
发帖数: 186 | 49 Research Assistant in Optical Sensors, ECE (Boston
Area)
Position: PhD RA in Optical Sensors
Organization: Electrical & Computer Engineering Department, UMASS- Lowell
Location: Lowell, USA
Description:
A highly motivated PhD RA in optical sensors is needed. Our current research includes biosensors, sensors for harsh environment, MEMS technology applied in
optical field, special fiber waveguides, and adaptive optical sensors.
Our center features:
Good facilities: We can access a lot of |
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z********m
发帖数: 186 | 50 Research Assistant in Optical Sensors, ECE (Boston
Area)
Position: PhD RA in Optical Sensors
Organization: Electrical & Computer Engineering Department, UMASS- Lowell
Location: Lowell, USA
Description:
A highly motivated PhD RA in optical sensors is needed. Our current research
includes biosensors, sensors for harsh environment, MEMS technology applied in
optical field, special fiber waveguides, and adaptive optical sensors.
Our center features:
Good facilities: We can access a lot of... 阅读全帖 |
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