Plasmonics

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4 What are graphene challenges and problems especially in THz region and transistor?
By Reza Hekmati · Amirkabir University of Technology

Reza Hekmati · Amirkabir University of Technology

Thanks for your answers

Thanks for your answers

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9 Why is there a split in single particle resonance dip (in transmission spectra) when the periodicity of nanoantenna arrays is increased?
By Upkar Kumar · Cochin University of Science and Technology

Sriram Guddala · University of Hyderabad

Hi Upkar, If I understand well your structure, these are two kinds of resonances due to the longitudinal and transverse nature of surface plasmon reso... [more]

Hi Upkar, If I understand well your structure, these are two kinds of resonances due to the longitudinal and transverse nature of surface plasmon resonance (SPR) of cylindrical Ag nano rods (antenna). One is due to dipole contribution and second one a multi polar contributions. The longer wavelength peak shift as a function of length of the rod is expectory. But in your case the length of the rod is fixed, so there should be contribution from the periodicity. This kind of periodic plasmonic structures are well studies to great extent by prof. Jermy J.baumberg from University of Cambridge. Better your refer to their publications. Here is the home page of the group. http://www.phy.cam.ac.uk/people/baumbergj.php Good luck Sriram.G

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13 How to find out whether surface polaritons are getting strongly coupled with quantum dots or not?
By Upkar Kumar · Cochin University of Science and Technology

Upkar Kumar · Cochin University of Science and Technology

Dear Himanshu, I was about to put the same point that as R.I of the quantum dot is more than that of air, there should be a red shift. But as you rig... [more]

Dear Himanshu, I was about to put the same point that as R.I of the quantum dot is more than that of air, there should be a red shift. But as you rightly said CdSe/Zns absorbs around 650nm (613nm for the QD I have), the blue shift is essentially due to absorption by quantum dots. Thanks for you explaination. It was very helpful. Upkar

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4 With plasmonic nanostructures at resonance, the extinction and scattering cross sections are at their maximum.
By Leo-Jay Black · University of Southampton

Bedir Yosif · Kafrelsheikh University

The sum of absorption and scattering is called extinction. for large particles extinction is dominated by scattering whereas for small particles it is... [more]

The sum of absorption and scattering is called extinction. for large particles extinction is dominated by scattering whereas for small particles it is associated with absorption. This effect can be used to detect extremely small metal particles down to 2.5 nm diameter which are used as labels in biological samples. The transition between the two size regimes is characterized by a distinct color change. For example, small gold particles absorb green and blue light and thus render a red color. On the other hand, larger gold particles scatter predominantly in the green and hence render a greenish color. A very nice illustration of these findings is colored glasses.

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1 Which resistance would be better for silver nanodot fabrication using EBL?
By Upkar Kumar · Cochin University of Science and Technology

Jens Bolten · AMO GmbH

The circularity of your nanodots will depend on a variety of parameters such as the diameter of the dots, the thickness of the Ag layer, the ebeam too... [more]

The circularity of your nanodots will depend on a variety of parameters such as the diameter of the dots, the thickness of the Ag layer, the ebeam tool and the PMMA development process used, and so on. As you mention a MMA/PMMA double layer resist stack I assume that you want to fabricate the nanodots via a lift-off process. For larger (d>200nm) and/or thicker (t>20nm) Ag dots a stack like this might be a good or even the only choice. For very small dots and a very thin Ag layer a single PMMA might be the better option, depending on your tool and process. If you both resist materials available I would simply give both options a try on a test sample and then chose the one showing the better results.

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2 What conditions make silver nanoparticles oxidize easily?
By Syifa Hamdan · University of Malaya

Syifa Hamdan · University of Malaya

thank you so much Martin

thank you so much Martin

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7 Nanoparticle plasmon resonance position.
By Maxim Shcherbakov · Lomonosov Moscow State University

Bedir Yosif · Kafrelsheikh University

I think the problem is in wrong data for the Au refractive index that you use. or the wrong data for the (water) H2o refractive index. the type of wa... [more]

I think the problem is in wrong data for the Au refractive index that you use. or the wrong data for the (water) H2o refractive index. the type of water and its purity will changes your results. the plasmon resonance depends on the shape, material , size and surrounding medium. please check these parameters.

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28 How can I extract the values of data plotted in a graph which is available in pdf form?
By Jagmeet Sekhon · Sant Longowal Institute of Engineering and Technology

Yuxin Jia · Bekaert

As Mr. Silva recommended, windig will be enough for you. More important, it is free. :)

As Mr. Silva recommended, windig will be enough for you. More important, it is free. :)

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6 What if Applied Physics Letter publishes a junk paper without your consent?
By Amir Mohammadizia

Arunandan Kumar · Université de Bourgogne

Dear Sir, You are a contributing author in this paper and if something is false in this paper, you should have noted it before communicating the manus... [more]

Dear Sir, You are a contributing author in this paper and if something is false in this paper, you should have noted it before communicating the manuscript. Since you are a contributing authors, you also share this misconduct and if in any case, the corresponding authors has not shown you the manuscript before submission, you can complaint against the paper to editorial board. Since Applied Physics Letters is a very reputed journal, this type of thing should be stopped right away and as a contributing author it is your responsibility.

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8 How to prepare monodisperse silver nanoparticles (<10 nm) without using any organic capping agent?
By Himanshu Tyagi · Indian Institute of Technology Bombay

Ahsanulhaq Qurashi · King Fahd University of Petroleum and Minerals

@ tyagi use ascorbic acid

@ tyagi use ascorbic acid

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Question:
Open How to put polystyrene microspheres into a uniform, close-packed structure?
The particles are of different sizes, how can the particle size be reduced? I have tried with acetone but I'm not getting a size reduction. I am keepi... [more]

The particles are of different sizes, how can the particle size be reduced? I have tried with acetone but I'm not getting a size reduction. I am keeping my sample in acetone for ten seconds. Does anyone know the reason? How long should I keep sample in acetone for? After reducing the size, what are the different techniques to make a uniform close-packed structure from polystyrene microspheres?

By Kishan Menghrajani · Vellore Institute of Technology

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4 Is there any advantage of Ag (Silver) core-- Au ( Gold) shell nanoparticles over Au ( core)- Ag ( shell) nanoparticles ??
By Radhakant Singh · Cochin University of Science and Technology

Ward Brullot · KU Leuven

As Robin already pointed out, the dipole plasmon frequency of the hybrid particles will change depending on the core/shell materials and their relativ... [more]

As Robin already pointed out, the dipole plasmon frequency of the hybrid particles will change depending on the core/shell materials and their relative radii/volumes. If your particles are spherical, the plasmon frequency of the hybrid molecules can be analytically calculated using Mie theory. One easy to use program for this purpose is Mielab (http://sourceforge.net/projects/scattering/files/MieLab/). Since you want to perform SERS, the position, intensity, FWHM and quality factor of the plasmon resonance of your material is of utmost importance. Not only for the molecules you want to detect, but also related to the method/setup used for detection. As such, since plasmon parameters depend on the material properties, the composition of the nanoparticles does have a major influence on the SERS signal. Whether the Ag/Au or the Au/Ag Core/shell configuration is best for your experiments further indeed depends on toxicity, oxidative and chemical resistance of the shell and probably quite some other biological/chemical/physical parameters.

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Question:
Open Can somebody suggest a way of cleaning thin (1-2 mm diameter), long (~5 cm) capillaries (sealed on one end) from gold nanoparticle solutions?
Gold spheres, rods and cages; unconjugated.

Gold spheres, rods and cages; unconjugated.

By Serge Grabtchak · University of Prince Edward Island

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30 Superposition does not conserve energy?
By Peng Zhang · University of Michigan

Fritz Caspers · CERN

Hi Mikhail Kozlov maybe we can continue that discussion by normal e-mail in more details if your are interested. Fritz.Caspers@cern.ch

Hi Mikhail Kozlov maybe we can continue that discussion by normal e-mail in more details if your are interested. Fritz.Caspers@cern.ch

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5 Can some one explain the 'mirror effect' phenomenon in metal enhanced fluorescence?
By Badri Aekbote · Hungarian Academy of Sciences

Soraya Zaiba · University of Science and Technology Houari Boumediene

unfortunately, my licence expired, otherwise I'll do it for you. sorry. for FDTD look at this website www.lumerical.com

unfortunately, my licence expired, otherwise I'll do it for you. sorry. for FDTD look at this website www.lumerical.com

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Answer added to:
3 How to synthesize spherical gold nanoparticles?
By Upkar Kumar · Cochin University of Science and Technology

Dusan Bozanic · University Carlos III de Madrid

Hi, Apart from the energy of the evaporated species, the final morphology of gold nanostructures can also depend on the type of substrate used for PL... [more]

Hi, Apart from the energy of the evaporated species, the final morphology of gold nanostructures can also depend on the type of substrate used for PLD. The energy can be lowered by introducing inert gas (like Ar) in the deposition chamber, for example. Take a look here : http://dx.doi.org/10.1002/pssr.201004046 Hope this helps! D.

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1 Is here anybody with access to plasmon surface resonance?
By Tomáš Hluska · Palacký University of Olomouc

Parthasarathi Gangopadhyay · Indira Gandhi Centre for Atomic Research

We have system to study or analyze surface plasmon resonance.

We have system to study or analyze surface plasmon resonance.

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3 Surface Plasmon
By Sumathi Ayyalusamy · Manipal University

Victor Dolores-Calzadilla · Technische Universiteit Eindhoven

Hi Sumathi, A surface plasmon as any other mode stores energy itself, however it decays very fast due to high metal loss, which results in heat genera... [more]

Hi Sumathi, A surface plasmon as any other mode stores energy itself, however it decays very fast due to high metal loss, which results in heat generation. There are some approaches to store electromagnetic energy with plasmonic and metallic cavities, which can actually be used for the design of plasmonic/metallic lasers.

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Question:
Open Symposium on Recent Advances in Optical, Acoustic, and Other Emerging Metamaterials (MRS Fall meeting, deadline for Abstract: June 19, 2012)
This symposium aims to bring together researchers working in the broad areas of physics, chemistry, materials science, mechanical engineering, and ele... [more]

This symposium aims to bring together researchers working in the broad areas of physics, chemistry, materials science, mechanical engineering, and electrical engineering to share recent progress in the broad metamaterial scope, to identify critical problems, and to provide promising solutions for creating functional metamaterials and devices. Session topics will include (but will not be limited to): Theory and new physics Path to control loss and dispersion in metamaterials Metamaterial-enabled imaging and light emission and absorption

http://www.mrs.org/f12-cfp-bb/ ×

By Nicholas Fang · Massachusetts Institute of Technology

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