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!
@tonyacoffey5568
6 жыл бұрын
Thanks everyone. Glad you enjoyed it.
@divakarsharma829
4 жыл бұрын
can u send me litrature elated to surface plasmon resonance.
@andrewaitken3976
4 жыл бұрын
Thanks for the explanation, it was very helpful.
@rahulfromkerala
3 жыл бұрын
The best explanations on KZitem on surface plasmons... Thanks a lot..
@bhushanthakur6469
3 жыл бұрын
Thank you so much ma'am!
@BruinChang
3 жыл бұрын
Thank you!
@Sierra7329
Жыл бұрын
I graduated awhile ago and still come back to your lecture. Keeps my brain fresh
@Scott-if3ce
5 жыл бұрын
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
2 жыл бұрын
can you suggest any other resources?
@Scott-if3ce
2 жыл бұрын
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
2 жыл бұрын
@@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
2 жыл бұрын
@@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
2 жыл бұрын
@@soumyaa4230 You're welcome and good luck!
@emilyf9288
3 жыл бұрын
Thank you from a freshman chemistry student struggling through a lab on this!!
@Snow-tm9ic
Жыл бұрын
That guy Bose a Bengali Physicist what an unsung hero. His work rediscovered years later. The discoverer of Boson...
@Salarzani
5 жыл бұрын
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!
@Z_aya
5 ай бұрын
I really confused about this topic on my thesis and you really good to explained about it. Thank you. You have helped many people. ☺
@TylerLarson
2 жыл бұрын
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.
@pancakes1233-o1
4 жыл бұрын
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.
@srividhyag.b.738
3 жыл бұрын
One line. You're the best, professor.
@seyedehmaedehmozneb4801
3 жыл бұрын
Perfect Description. My Dissertation and defense owe it to you and your lecture. Thank you.
@hasanasim3980
3 жыл бұрын
So helpful! This is the simplest definition of surface plasmons I have found on the web.
@erickbsb
6 жыл бұрын
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
@RajendraKumar-qq2xz
5 жыл бұрын
Superb lecture..clearly explained the surface plasmons. Thanks a lot.
@dickinsontanner
3 жыл бұрын
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 :}
@GodfatherRobert
Жыл бұрын
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.
@michelletheatom
5 ай бұрын
That was such a great explanation! Thank you for sharing this.
@alis5893
4 жыл бұрын
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
@aemier9869
6 ай бұрын
Very educational insight about plasmonics. Thank you.
@marinaazeredo1355
2 жыл бұрын
Great explanation! For the first time I understand surface plasmons and how they are formed :))
@LoanwordEggcorn
4 жыл бұрын
Thanks for sharing a very clear explanation of surface plasmons with the world!
@tejobhiru1092
3 жыл бұрын
wow..! what a crsytal clear explanantion of a a concept so difficult to visualize..! thank you so much... respect and gratitude..!
@folepi7995
3 жыл бұрын
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.
@zitopopper
7 жыл бұрын
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
7 жыл бұрын
That's nice to hear. By the end of your PhD, you can come give a guest lecture to my class. Good luck.
@sehreenhafiz4540
2 жыл бұрын
The theory is so precisely explained. Thankyou
@muhammadmahmudulhasan2863
3 жыл бұрын
Excellent explanation of the plasmons. Thank you so much
@jirispousta86
Жыл бұрын
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.
@M888HGAAAWNKLMTOZLNLSSSKKHHZBB
4 жыл бұрын
Thank so much for posting this! Clear, concise and excellent presentation.
@hyunwoopark131
Жыл бұрын
Metals are shiny! I didn't know the surface plasmon was doing this!
@ellisguernsey4892
3 жыл бұрын
Great video, best I have seen online.
@TheAxelDude
3 жыл бұрын
Thank you and very well delivered! Even a self-learner understood.
@kritika1315
5 жыл бұрын
This video just made my life easier!!👍👌
@amberk6375
6 жыл бұрын
Thank you so much for the explanation, it's very clear and helps a lot.
@alimehrjooy8807
5 жыл бұрын
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.
@aranzavillasenor287
2 жыл бұрын
You made it look simple! Thank you for the amazing explanation.
@chasecolin22
4 жыл бұрын
Hey Dr Coffey! Miss attending your lectures. Hope everything is well for you.
@caiohussene9923
2 жыл бұрын
Incredible lecture. I AM Synthesising Ag Nanoparticles, it helped a lot 🙃
@revatidixit9335
4 жыл бұрын
Thank you for making this video and making me clear all my doubts regarding SPR 🙂
@tesfayefeyisa6170
2 жыл бұрын
thank you very much. really I got basic science. please add more one by different method.
@ahmedmohsen656
5 жыл бұрын
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 :)
@joewebster903
5 жыл бұрын
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
5 жыл бұрын
Yes of course there is always more to be understood. This is an introductory lecture for a nanoscience class that I teach.
@joewebster903
5 жыл бұрын
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
5 жыл бұрын
Keyboard warrior
@LoanwordEggcorn
4 жыл бұрын
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
4 жыл бұрын
@@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.
@nazifawali9699
6 жыл бұрын
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
6 жыл бұрын
Thanks! I'm glad it helped.
@kangkanakalita9323
5 жыл бұрын
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!
@gene4094
5 ай бұрын
These hypothetical scenarios need an energy system principle that can replace fossil fuels energies.
@jsf9066
2 ай бұрын
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!
@alexlucassen8489
Жыл бұрын
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
@hrishikesh7905
3 жыл бұрын
Thank you for such a beautiful explanation and apt illustration s
@israrahmad6637
4 жыл бұрын
thank you very much ,i got much information from your this video wish you all the best
@3abwareth
3 жыл бұрын
Thank You so much for the simple and great explanation!
@dhimanroyturzo6620
5 жыл бұрын
Clear and clean explanation! Thanks a lot!
@LenaPrincess
7 жыл бұрын
Very good explanation. Thanks, Tonya!
@ggggg6249
5 жыл бұрын
Nice explanations and slides! Great work
@mehdi_jafari
3 жыл бұрын
Hello friends 🌹 I had a few questions, if anyone knows, thank you for your help 🙏 I am researching structures based on spoof surface plasmon polariton in the microwave regime. I would appreciate it if you help me...... I had three questions: 1- How can I prove that these structures work based on surface plasmon in cst?(What should I observe in the structure to prove this?) 2- What is the advantage of using these structures? Because we have a lot of similar structures without this corrugated part that they are smaller and simpler. 3- What diagrams do I need in cst to prove sspp? 4- What is a light line? Why assign a wave number to it? And do they measure with it? What are the ups and downs of the Light Line ? Why does up is PP and Down SPP? What is its formula? 5- How to find the formula of MS, SIW, CPW lines? can not find anything in it that the air line in leaky wave antennas becomes the same as the light line? Or are they different? If you have any books, articles or sources, thank you for introducing them
@dr.rejithrs9747
5 жыл бұрын
excellent explanation for surface plasmon resonance
@prajnan4497
Жыл бұрын
Why we call it as UV-Visible absorption spectra instead of extinction spectra? Why we tell absorption peak of nanoparticles instead of extinction peak..?
@gabrielsanderson7257
2 жыл бұрын
WALLAH BEST ONE AMAZING GOD BLESS SHUKRAN
@thanawitsagulthang6471
5 жыл бұрын
I never understand SPR through the read of many article and lecture from my professor but now I do! Great explanation! Thanks a lot!
@jakubsacharczuk5863
6 жыл бұрын
Excellent, made it nice and easy to understand.
@franzfischer3631
Жыл бұрын
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.
@javierdavidmartinromera2778
4 жыл бұрын
Thank you very much for your explanation, it was very clear and it's been really helpful.
@kafisharma962
2 жыл бұрын
Thank you so much. It helped me a lot.
@Jefferypan2011
5 жыл бұрын
I learnt a lot! Thank you so much! Great video!
@pagey1529
4 жыл бұрын
Great video, great explanation!
@antatolii79
2 жыл бұрын
Thank you! It is very helpful.
@ahmaddarweesh2677
4 жыл бұрын
This is a great job! Thanks.
@sidewaysfcs0718
5 жыл бұрын
I personally wouln't say that light is *absorbed* and re-emitted by the metallic surface, emission is a non-parametric process and also is completely random is phase, if light really was absorbed and re-emitted by metals, then they would *appear* to scatter the light just like a rough colourless crystal would, in all directions and appear white and exert diffuse reflection instead of clean reflection. Reflection is a parametric process and therefore depends on angle of incidence. It's an elastic scattering phenomenon and respects the laws of reflection, emission (namely spontaneous emission) does not. From wiki: " Light of frequencies below the plasma frequency is reflected by a material because the electrons in the material screen the electric field of the light. Light of frequencies above the plasma frequency is transmitted by a material because the electrons in the material cannot respond fast enough to screen it. In most metals, the plasma frequency is in the ultraviolet, making them shiny (reflective) in the visible range. Some metals, such as copper[4] and gold,[5] have electronic interband transitions in the visible range, whereby specific light energies (colors) are absorbed, yielding their distinct color. " It's well known that most metals are translucent to ultraviolet light.
@rmarinero
6 жыл бұрын
Bravo! very good explanation, thank you so much!
@OChemRules
4 жыл бұрын
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
@marigo5951
11 ай бұрын
very nice, thank you!
@wakka247
3 жыл бұрын
thx, getting my nobel prize next year
@srestsomay3533
4 жыл бұрын
Best explanation ever!!
@Ravi7jassal
3 жыл бұрын
Thank you so much.
@dasuvasimalla6265
6 жыл бұрын
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?
@anarchistalhazen7084
3 жыл бұрын
This is great, thank you!
@abib1487
5 жыл бұрын
A really good video, thanks a lot.
@miadiamia
3 жыл бұрын
hell yeah i understand resonance raman a bit better now
@maxkarl4852
3 жыл бұрын
Very useful, thanks
@Chennai2scotla
2 жыл бұрын
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
@alaskanmooseman5975
5 жыл бұрын
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
5 жыл бұрын
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
5 жыл бұрын
@@tonyacoffey5568 That makes sense, thanks!
@nowynope1861
3 жыл бұрын
Thank you for this explanation :)
@mohammadazizian3411
6 жыл бұрын
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
6 жыл бұрын
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
6 жыл бұрын
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
6 жыл бұрын
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
6 жыл бұрын
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
6 жыл бұрын
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.
@tv-invent5201
3 жыл бұрын
Is it me or is this array remind anyone of DNA and also Einstein's theory that light travels in a spiral???? And I believe he theorized that light also had a particle??
@ywk7282
3 жыл бұрын
Are confined metal particles the same as quantum dots??
@chdrums9
6 жыл бұрын
In the graphs shown at 14:00 , does the peak absorbance always occur at a nanoparticle's SPR wavelength? or not necessarily?
@tonyacoffey5568
6 жыл бұрын
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.
@MeganKTN
4 жыл бұрын
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
2 жыл бұрын
time varying electric field component of the electromagnetic incident wave
@elyazidassade1514
6 жыл бұрын
Thank you soooo much you explain very well !
@tilkesh
2 жыл бұрын
Thank you
@qingzhezhang1171
5 жыл бұрын
I am just wondering whether these resonant electrons are from valence band or conduction band.
@elliotstacey1393
2 жыл бұрын
youre a champion tysm
@ulamss5
2 жыл бұрын
7:15 are those waves in the metal phonons?
@luisguillermomendozaluna1540
6 жыл бұрын
Nice video. Thanks a lot
@SirMilad
Жыл бұрын
What is the difference between SP and LSPR?
@MrGeragon
3 жыл бұрын
What about the plasmons in XPS ?
@MoneylessWorld
3 жыл бұрын
"The electric field's oscillatory pattern causes a rippling wave pattern in the spatial distribution of the electrons. However, the response of the electrons is out of phase with the EM wave." I suppose then that our mirror image could not possible be a true reflection of ourselves. The light (EM waves) coming from us, is bounced back in an other form, the rippling in the metal iron gas sea which is out of phase. It's a violent and chaotic view of what our reality is supposed to be really. In a sense, the electron gas sea from the metal is in balance but stationary. The traveling EM radiation is also balanced but in motion. Then there's impact and the ripples of "the clash" travel back to our eyes. What kind of fucked up version then do we see in the mirror, compared to our true resonance?
@bowu2094
4 жыл бұрын
It's very helpful, thx..~!
@Alamsacademy
2 жыл бұрын
@tonya coffey can you please share the slides
@marcelorofer
6 жыл бұрын
Thank you, Dr. Coffey!
@Hassan_zare
6 жыл бұрын
Thanks for this lecture
@sk56789
4 жыл бұрын
But its Fermi-Dirac statistics and NOT Bose-Einstein because electrons are fermions.
@tonyacoffey5568
4 жыл бұрын
Yes, as I corrected in the description above. I am trying to coin a new phrase, the "vypo." It's a verbal typo.
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