Surface Plasmons

[@tonyacoffey5568]

Thanks everyone. Glad you enjoyed it.

[@divakarsharma829]

can u send me litrature elated to surface plasmon resonance.

[@andrewaitken3976]

Thanks for the explanation, it was very helpful.

[@rahulfromkerala]

The best explanations on KZbin on surface plasmons... Thanks a lot..

[@bhushanthakur6469]

Thank you so much ma'am!

[@BruinChang]

Thank you!

[@sarafishman7130]

I understand! I understand! Thanks for a wonderful explanation, with the conceptual material so well presented before even a breath of mathematics. You are a wonderful teacher!

[@Sierra7329]

I graduated awhile ago and still come back to your lecture. Keeps my brain fresh

[@Scott-if3ce]

Im in my third year Nanoscience undergrad....and this is the best explanation I've found explaining surface plasmons compared to any research paper or notes I've read.

[@soumyaa4230]

can you suggest any other resources?

[@Scott-if3ce]

I'm not sure since I'm in photonics, but try any grad level text book that has like "Surface Plasmons and Nanophotonics" by Mark L. Brongersma, Pieter G. Kik

[@Scott-if3ce]

@@soumyaa4230 I'm not sure since I study photonics, and only briefly know LSPR and SPR, but you could try any grad level textbooks like "Surface Plasmons Nanophotonics" by Mark L. Brongersma, Pieter G. Kik

[@soumyaa4230]

@@Scott-if3ce thank you so much for replying, I'll surely check out that book Actually I'm doing an internship on surface plasma wave induced higher harmonic generation on metal semiconductor interface It's my first time studying this topic So thank you again

[@Scott-if3ce]

@@soumyaa4230 You're welcome and good luck!

[@Salarzani]

You explained so many questions to me, that I had since I started my chemistry studies, with this video. Thank you for your precise explonations!

[@emilyf9288]

Thank you from a freshman chemistry student struggling through a lab on this!!

[@erickbsb]

I'm so glad I found your channel. If you have anything on surface enhancement Raman and IR, I'll buy tickets to the first row, please

[@pancakes1233-o1]

Thanks Tonya for your valuable lecture, we scientists often miss the -read between the lines- information in technical books and your information regarding the physical picture at what happens inside the bulk and surface are really nice. The phase difference between incoming and radiated plasmon light can be understood due from the dispersion relation of the classically damped harmonic oscillator phase lag for high frequency (e.g. visibe light) and your explanation regarding quantum confinement of nanoparticles can also be understood from the particle in a box model I am sure you already know all this stuff and its always nice to see things from a physical picture framework as you explained.

[@hasanasim3980]

So helpful! This is the simplest definition of surface plasmons I have found on the web.

[@RajendraKumar-qq2xz]

Superb lecture..clearly explained the surface plasmons. Thanks a lot.

[@marcomikkers7310]

You are wonderful, I study Tax Law and yet I understood this fully (except from the math). You are a very talented communicator and science educator :)

[@srividhyag.b.738]

One line. You're the best, professor.

[@Z_aya]

I really confused about this topic on my thesis and you really good to explained about it. Thank you. You have helped many people. ☺

[@aemier9869]

Very educational insight about plasmonics. Thank you.

[@M888HGAAAWNKLMTOZLNLSSSKKHHZBB]

Thank so much for posting this! Clear, concise and excellent presentation.

[@marinaazeredo1355]

Great explanation! For the first time I understand surface plasmons and how they are formed :))

[@LoanwordEggcorn]

Thanks for sharing a very clear explanation of surface plasmons with the world!

[@ulamss5]

7:15 are those waves in the metal phonons?

[@jirispousta86]

Bose-Einstein statistic cannot be applied on electrons, since they are fermions. I guess it was just a momentary black out. Otherwise, very nice explanation.

[@GodfatherRobert]

This Is a great video the microphone hurts my ear slightly so i keep volume halfway all in all this is an absolutely awesome explanation I just started to learn about Plasmons and this is the tip of the iceberg Fermions really make more sense of it all now. Thank you for this lecture I have subscribed now.

[@tejobhiru1092]

wow..! what a crsytal clear explanantion of a a concept so difficult to visualize..! thank you so much... respect and gratitude..!

[@TylerLarson]

I'm not taking this class.. I graduated 20y ago in an entirely different field. But I still thought this video was interesting and explained something in a satisfactory way that has puzzled me for years.

[@chasecolin22]

Hey Dr Coffey! Miss attending your lectures. Hope everything is well for you.

[@ellisguernsey4892]

Great video, best I have seen online.

[@muhammadmahmudulhasan2863]

Excellent explanation of the plasmons. Thank you so much

[@dickinsontanner]

i typed "Do mirrors reflect UV light?" into google and now im here asking what a plasmon is.haha This was very helpful and i appreciate it :}

[@alis5893]

Fantastic Introductory and conceptual explanation of plasmons. Very nice and efficient compared to videos where the instructor sprays you with math and quantum physics (who themselves usually don't understand very well) prior to giving an intuitive and conceptual lecture. Thank you

[@sehreenhafiz4540]

The theory is so precisely explained. Thankyou

[@michelletheatom]

That was such a great explanation! Thank you for sharing this.

[@abhishekpatel.phy0176]

plese send pdf of these ppt

[@amberk6375]

Thank you so much for the explanation, it's very clear and helps a lot.

[@folepi7995]

The Figure with the two spheres is super confusing. It almost looks like the distance between the NPs must be 1/2 wavelength. But thats not the case. The distance between the NPs are topic of plasmonic surface lattice resonances.

[@kritika1315]

This video just made my life easier!!👍👌

[@TheAxelDude]

Thank you and very well delivered! Even a self-learner understood.

[@hyunwoopark131]

Metals are shiny! I didn't know the surface plasmon was doing this!

[@alimehrjooy8807]

It is a straightforward way to explain and thank you for your nice lecture. Although I am not a physics student, it helped me so much. Cheers.

[@kyr26]

wow this is amazing!! such a clear explanation! thank you so much :))

[@jsf9066]

17:05 at plasma frequency, does the metal ‘absorb’ the energy and make energy loss? It looks that plasma frequency(ω_p) and LSPR frequency is quite different. It would be glad if I can get you answer. Thanks for the great lectures!

[@aranzavillasenor287]

You made it look simple! Thank you for the amazing explanation.

[@dhimanroyturzo6620]

Clear and clean explanation! Thanks a lot!

[@ggggg6249]

Nice explanations and slides! Great work

[@Alamsacademy]

@tonya coffey can you please share the slides

[@nazifawali9699]

Thank you so much for explaining this so well!! i have been struggling to understand this for some time now,and your lecture really helped

[@tonyacoffey5568]

Thanks! I'm glad it helped.

[@prajnan4497]

Why we call it as UV-Visible absorption spectra instead of extinction spectra? Why we tell absorption peak of nanoparticles instead of extinction peak..?

[@MrGeragon]

What about the plasmons in XPS ?

[@3abwareth]

Thank You so much for the simple and great explanation!

[@ahmedmohsen656]

great work and hope to continue you simple method of teaching and intense information confined with an easy water-like method of explanation!, keep it up :)

[@gabrielsanderson7257]

WALLAH BEST ONE AMAZING GOD BLESS SHUKRAN

[@revatidixit9335]

Thank you for making this video and making me clear all my doubts regarding SPR 🙂

[@zitopopper]

Thanks for sharing this lecture! I've just started my PhD on plasmonic catalysis with absolutely no theoretical knowledge about it, after watching your video it all makes sense now :)

[@tonyacoffey5568]

That's nice to hear. By the end of your PhD, you can come give a guest lecture to my class. Good luck.

[@jakubsacharczuk5863]

Excellent, made it nice and easy to understand.

[@dr.rejithrs9747]

excellent explanation for surface plasmon resonance

[@srestsomay3533]

Best explanation ever!!

[@kangkanakalita9323]

Thank you so much for the video. I'm kind of new to this field so your video helped me understand everything very easily. Thanks a lot!

[@hrishikesh7905]

Thank you for such a beautiful explanation and apt illustration s

[@israrahmad6637]

thank you very much ,i got much information from your this video wish you all the best

[@gene4094]

These hypothetical scenarios need an energy system principle that can replace fossil fuels energies.

[@LenaPrincess]

Very good explanation. Thanks, Tonya!

[@alaskanmooseman5975]

I'm confused. For metals, I thought the Fermi energy was the energy difference between the highest and lowest occupied single-particle states in a quantum system of non-interacting fermions at absolute zero temperature, with the lowest occupied state typically taken to mean the bottom of the conduction band.

[@tonyacoffey5568]

Yes, that's right. On the slides, I say that "the electron's highest occupied energy state at absolute zero is the Fermi energy." Perhaps I could have been more specific and said "valence electrons" to differentiate between the electrons in the 1s state from the outermost shell, but that is a bit picky, as I was discussing the free electron sea at the time (which are valence electrons). So with that definition, take the lowest energy valence electrons and call that an energy of 0, and then the highest occupied states have the Fermi energy. This is at absolute zero. At higher temperatures, the distribution function is not cut off so sharply, and looks more rounded, and some electrons have energies higher than the Fermi.

[@alaskanmooseman5975]

@@tonyacoffey5568 That makes sense, thanks!

[@SirMilad]

What is the difference between SP and LSPR?

[@pagey1529]

Great video, great explanation!

[@anarchistalhazen7084]

This is great, thank you!

[@ahmaddarweesh2677]

This is a great job! Thanks.

[@caiohussene9923]

Incredible lecture. I AM Synthesising Ag Nanoparticles, it helped a lot 🙃

[@kafisharma962]

Thank you so much. It helped me a lot.

[@Jefferypan2011]

I learnt a lot! Thank you so much! Great video!

[@antatolii79]

Thank you! It is very helpful.

[@marigo5951]

very nice, thank you!

[@javierdavidmartinromera2778]

Thank you very much for your explanation, it was very clear and it's been really helpful.

[@fjtyjty]

what are the uses of surface plasma resonance?

[@dasuvasimalla6265]

it's really good. i have one doubt i.e. how did you get different type of responses for different wavelengths? i mean , have you use any equation or coding?

[@joewebster903]

We have experienced Plasmonic mechanisms with semiconductive transition metal oxides on a mulligan insulator when in proximity to organic absorbers provides both bathochromic red shifts in the organic absorber and hyperchromicity that is extraordinary. Clearly the level of energy quantanized by exposure to light transfers the Plasmonic energy to the adjacent organic absorber to induce hyperchromicity effects. This industrial example is now utilized commercially to provide broad permanent absorption over a range of 200 to 800 nm and into the mid and far infrared region Therefore Plasmonic and Plasmonic effects are no longer limited by nanogold or nanosilver examples but rather among other more prevalent and far cheaper species yet to be discovered to date. Spectral enhancers that function by Plasmonic mechanisms clearly broaden those more expensive and fugitive organics with their own physical chemical limitations. Nice lecture but there is much more to be understood!

[@tonyacoffey5568]

Yes of course there is always more to be understood. This is an introductory lecture for a nanoscience class that I teach.

[@joewebster903]

We have yet to fully grasp the full implications of the science ! When we think we know something we discover we knew nothing . We need to let knowledge come to us and not the other way around

[@dylanmckelvey6734]

Keyboard warrior

[@LoanwordEggcorn]

She never said that gold and silver were the only materials that can have surface plasmons. They're commonly used in school laboratories, so a reasonable example to cite in a brief introductory lecture.

[@LoanwordEggcorn]

@@joewebster903 She's teaching basic principles and did a superb job at it. If you don't like it, make some of your own videos.

[@wakka247]

thx, getting my nobel prize next year

[@Ravi7jassal]

Thank you so much.

[@abib1487]

A really good video, thanks a lot.

[@ywk7282]

Are confined metal particles the same as quantum dots??

[@rmarinero]

Bravo! very good explanation, thank you so much!

[@adele8203]

can you share the power point or images?

[@miadiamia]

hell yeah i understand resonance raman a bit better now

[@animeshdas572]

pls provide the ppt file.

[@tesfayefeyisa6170]

thank you very much. really I got basic science. please add more one by different method.

[@maxkarl4852]

Very useful, thanks

[@chdrums9]

In the graphs shown at 14:00 , does the peak absorbance always occur at a nanoparticle's SPR wavelength? or not necessarily?

[@tonyacoffey5568]

Hmmm. I believe the answer is not necessarily. In a UV VIS spectrum, all it means is that the energy of that particular wavelength is absorbed by the material. This can be due to exciting a transition in the material that happens to have that energy, in addition to the SPR phenomenon. So it would depend on what material the nanoparticle is made of. You would have to make sure that there are no corresponding excitations in the bulk material at those energies, among other possibilities, before jumping to any conclusions. Hope that helps.

[@elyazidassade1514]

Thank you soooo much you explain very well !

[@nowynope1861]

Thank you for this explanation :)

[@Chennai2scotla]

Hi this video is very useful. i would like to know how do you plot a SPR graph with reflectivity vs angle? As i have made a matlab program and generated graph. but i do not know how to plot a graph for reflectivity vs angle for different thickness?i hope to hear fromyou...thank you

[@franzfischer3631]

Erratum: As you said, Electrons are Fermions and they obey the Fermi Dirac Statistic and not the Bose Einstein Statistic. The graph that you have shown with the Fermi Energy was the one for Fermi Dirac but you were wrongfully talking about Bose Einstein. In the Bose Einstein Statistic, all particles can have the same ground state.

[@thanawitsagulthang6471]

I never understand SPR through the read of many article and lecture from my professor but now I do! Great explanation! Thanks a lot!

[@elliotstacey1393]

youre a champion tysm

[@qingzhezhang1171]

I am just wondering whether these resonant electrons are from valence band or conduction band.

[@sk56789]

But its Fermi-Dirac statistics and NOT Bose-Einstein because electrons are fermions.

[@tonyacoffey5568]

Yes, as I corrected in the description above. I am trying to coin a new phrase, the "vypo." It's a verbal typo.

[@mohammadazizian3411]

I enjoyed your lecture very much. Even if it doesn't meant to, it kinda explains the nature of refractive index. What I am puzzled with though is that how (if at all) the resonance might be affected with the polarization of incident EM wave.

[@tonyacoffey5568]

According to the theory, surface plasmons can only be excited by field components that match the parallel wave vectors. If you think about a small, spherical nanoparticle suspended in a liquid, no matter how you orient the incoming wave, there will be a part of the sphere that has a parallel component to it. So the plasmon would still be excited. If you look at this link: www.photonics.ethz.ch/fileadmin/user_upload/Courses/NanoOptics/plasmonss.pdf there is a section that describes what happens for a small spherical particle. The expression is dependent upon the dielectric constant of the materials and the frequency of the light. At least, that's my take on it.

[@mohammadazizian3411]

Thanks for the paper, you are right about single nanoparticles. Yet, I am concerned about their asymmetrical aggregation, specifically in case of gold nano rods. Then, would it be possible to observe different spectrum using polarized and unpolarized light, or based on the polarization; estimate the orientation?

[@tonyacoffey5568]

That sounds like a topic for advanced research. I suggest you do a thorough search of the peer reviewed literature. Microscopy and spectroscopy, specifically AFM, EDS, SEM, etc., is my area of research. Not plasmonics. This is just an introductory lecture on the subject for my Introductory Nanoscience class, which is a survey course in the subject. Good luck!

[@adrianaumbria7232]

Hi! thank you for making this video I would like to ask you the title of the book you just referred in this comment. Greetings from Venezuela and thank you very much for the explanation :)

[@tonyacoffey5568]

Thanks! There's a link to a pdf file in my comment above that you can click on. Not sure if its a book or just a really long paper, but its helpful for plasmon theory. There's a good general intro to nanoscience textbook that I use in the course, "Nanotechnology: Understanding Small Systems" by Rogers, Pennathur and Adams. Hope that helps.

[@MeganKTN]

What is the mechanism that causes the oscillating electrons to re-emit the energy as reflected light instead of hold on to it and continue to oscillate? (re: 9:39 in the video). Is this something analogous to stimulated emission / spontaneous emission when atoms absorb photons? Further, what determines the coherence of the outgoing wave wrt to the incoming wave (if it is even coherent at all?)

[@syedmomshadahmad247]

time varying electric field component of the electromagnetic incident wave

[@RamanpreetKaur-id7hu]

THANK you mam... may you please share this ppt here?

[@GaneshSahooscientistmarsplanet]

very good

[@pradnyachoukekar]

someone PLEASE explain 7:05 to me

[@luisguillermomendozaluna1540]

Nice video. Thanks a lot

[@OChemRules]

Tonya, I think I am catching a bit of surface plasmon resonance but I was just curious as to what happens after absorption of the particular frequency or frequencies. Does this light energy transfer to actual motion of the particles, does it get dispersed as light but not directionally specific as the incident light and last, is the light we see from a nanoparticle the reflected light or is it light that travels straight through without reflection or refraction. Thanks, Dr. P. From Pratt Kansas

[@alexlucassen8489]

Nanogold seems to be very usefull for make the sunlicht wave lengths distribution (1300w/m2) mutch beter suited for the photon energy to ´translate´ to an electron push in the the solar cell p-n layer. Normally the photons sensesible materials work best only in relative small range of the available sun wave lengths By using nanogold the effeciency can be much higher of an photo cel by the `Surface Plasmons` effect of (nano)gold. It seems the first experimental solar panels based on this will be lanced in 2025

[@bowu2094]

It's very helpful, thx..~!