Edson P. Bellido Sosa. Emission Transmission Modulation Signal processing Detection Sensing .

Nanowire Photonics

Edson P. Bellido Sosa

Emission Transmission Modulation Signal processing Detection Sensing

Photonics

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{explanation is needed}

Consumer equipment

Telecommunication

Military

Entertainment

Photonics applications

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Medicine

Spectroscopy

Photonic computing

Photonics applications

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Miniaturization of devices low cost (?) low power consumption Confinement in two dimensions tunable bandgap Dislocations free nanoscopic and macroscopic world

Why Nanowires?

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“vapour–liquid–solid” (VLS) growth

Nanowire growth

Peter J. Pauzauskie, Peidong Yang, Nanowire photonics, Materials Today, Volume 9, Issue 10, October 2006, Pages 36-45

{explanation is needed}Use a few bullets to explain}

Tuning InGaN nanowires

Kuykendall, T., Ulrich, P., Aloni, S. & Yang, P. Complete composition tunability of InGaN nanowires using a combinatorial approach. Nature Mater. 6, 951–956 (2007).


Tuning InGaN nanowires(100) (002) (101)


GaN

InN

In

10–50nm X 0.5–1 μm

100–250nm x 1–2 μm




{Explain shortly what are these figures}


In

In



Photonics has a great potential for future applications in all areas of technology

Nanowires represent an important class of photonic building blocks

They have demonstrated the ability to tune the composition and energy gap of InGaN nanowires.

This nanowires had exceptional optical. Absorption and EELS spectroscopy were used

for the characterization.

Conclusions

Large scale integration of nanowires Self powered nanowire devices Nanowire toxicity Multi-core nanowires Single photon sources Photonic computing

Proposed research

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Questions?

G1Rebuttal: Nanowire photonics

Edson P. Bellido Sosa

Comment: The introduction part didn’t include basic concepts from spectroscopy, necessary to be able to interpret the results from the presented research work.

Yes, I did not considered necessary to mentioned those basic concepts of characterization techniques since I thought the audience had this knowledge. However, during the presentation I have noticed that this was not the case.

Comment: It should have been illustrated the design requirements and working principle of at least one potential application such as the procedure to make a logic in a photonic computer or the remote detection of threat agents. I chose to only talk about one application in detail since the time of the presentation was limited.

Comment: Hard to understand diagrams without explanation

I did not want to include much text on slides. I wanted to include important diagrams in the same slide to compare the different characterization techniques. But I explain the details on the talk.

Comment: The presentation was based in only one paper, which refrained the audience from evaluating how the presented research stands on the whole field. I chose to talk about one application in detail since the time of the presentation was limited and photonics is very wide field.

Comment: We have talked about toxicity of nanowires for half-semester long but no one yet came to a conclusion. I Agree. However I think the problem is that not much research is being doing in this field in comparison with research doing in applications and basic science of nanowires and other nanostructures.

Review G2-Photonics

Alfredo Bobadilla

Photonic nanowires – Lecture review

The introduction part didn’t include basic concepts from spectroscopy, necessary to be able to interpret the results from the presented research work.

It was shown in detail only the procedure to synthesize the nanowires.It should have been illustrated the design requirements and working principle of at least one potential application such as the procedure to make a logic in a photonic computer or the remote detection of threat agents.

Elemental devices like‘optical microcavity’ or ‘ring resonators’ which enable many photonic applications were not mentioned.

Limitations on the controlled connection or assembly of nanowires, which isfundamental to enable potential applications, were not illustrated.

Alfredo D. Bobadilla

G3 REVIEW:NANOWIRE PHOTONICS

By: Mary Coan3-30-10

Review

Listed applications for Photonics Gave positive aspects of Nanowires Discussed Formation of Nanowires

Hard to understand diagrams without explanation

Used graphs and diagrams to convey message Did not use bulletins so I can not follow

Review G4-Photonics

Diego A Gomez-Gualdron

Photonics• Consist in the technical application of light (generally visible) in order

to perform a task (e.g. sensing, information processing)

A signal transmitted by light traveling through optic fibers

www.digitalization.wordpress.com

www.wikipedia.com

mechanism

• The decay of an excited electron (with energy E2) to a non-excited state (with energy E1) is accompanied with the emission of a photon with energy hv=E2-E1

Nanowires

A nanowire emitting light Structure of a Silica nanowire

www.nersc.govwww.fas.harvard.edu

* Nanowire are cylindrical structures (typically semiconductors) with a high aspect ration an a diameter in the nano scale. Being semiconductors, the light they emit depends on their band gap (the energetic difference between the valence and conduction band)

• If one can tune the nanowire band gap, then you can control what light wavelength is emitted

• ‘ALLOY’ COMPONENTS!!!

Tuning the Band GapA rule of thumb is that if one mixes component A with a band gap EA and component B with a band gap EB, such that the resulting fraction are XA and XB, the resulting band gap is given by:

EAB=XAEA+XBEB (1)

Let us mix GaN and InN in a nanowire!!!

Increase of In molar fractionNature Mater. 6, 951–956 (2007).

•Change in the emitted light with composition

•Equation (1) holds•Change in the emitted light with composition

Incr

ease

of I

n m

olar

frac

tion

REVIEW• The speaker made a good job explaining the material contained in

the slides. However, the presentation fell short in its scope. Photonics is a very wide field. Although understandable that it can hardly be covered in 50 min, a greater effort in making the overview should have been made, so the bigger picture of the field could have been captured

• The presentation was based in only one paper, which refrained the audience from evaluating how the presented research stands on the whole field. Moreover, the paper presented was likely not the latest advance on the field as it was published three years ago.

REVIEW• The presentation was too short (13 slides), and the speaker missed the

opportunity to compensate the use of just one paper, by explaining it thoroughly, more specifically, the experimental procedure. Even when the synthesis of nanowires was covered in the first presentation of the semester, there was more to it. For instance, there are problems specifically related to the alloying of GaN and InN.

• Also, the speaker misinterpreted the experimental procedure. Particularly, how the control of the concentration was made. The speaker interpreted that this was made by changing the distance of the substrate to the nozzle, when in fact is made by controlling the vapor pressure of the Ga an In precursors (therefore the independent heating sources), as it can be read in the actual paper.

Review G6-Photonics

Norma L. Rangel

Nanowire Photonics, by Edson Bellido

• Edson’s presentation mentioned applications for Photonics, an overview of nanowires, fabrication and perspectives. These topics are a very complete and important outline for this presentation.

• However the presentation looks very brief and the outline was not covered in a considerable dept for the audience.

• The presentation could have been more educational, more details about the state of the art applications may have made the presentation more fruitful.

• Since only one paper was presented more concepts or details about the topic could have been presented.

Review G6-Photonics

Jung Hwan Woo

• Details on these research fields can really help improve the conclusion of the presentation

• What are the fields that can take advantage of large scale integration?• We have talked about toxicity of nanowires for half-semester long but no one yet

came to a conclusion. Maybe it is time for some of the presenters to come up with something remotely close to supporting for or against the usability of nanowires on human body based on the toxicity.

• Example of photonic computing could help the audience to understand what it is. Same for single photon sources

Edson P. Bellido Sosa. Emission Transmission Modulation Signal processing Detection Sensing .

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