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Explore Photonics

18. Juni 2020

Die Max Planck School of Photonics bietet über verschiedene Formate interessierten Zuhörern auf der ganzen Welt die Möglichkeit, Einblicke in spannende Forschung rund um Photonik zu gewinnen. Die Teilnahme ist immer kostenlos, eine Registrierung vorab ist jedoch notwendig. Hier finden Sie die Termine und Registrierungslinks für alle anstehenden Veranstaltungen.

MPSP Lecture Series

Wir sind stolz darauf, die besten deutschen Wissenschaftler auf dem Gebiet der Photonik zu unseren Fellows der Max Planck School of Photonics zu zählen. In einer Vorlesungsreihe geben sie Einblicke in diese Forschung. Wir freuen uns daher auf interessierte Zuhörer, die nach spannenden Präsentationen unserer Fellows an der Diskussion teilnehmen. Bitte melden Sie sich für jede virtuelle Vorlesung der Vorlesungsreihe über den jeweiligen Link an!
Controlling electrons on attosecond time scales - with a focus on the accelerator on a chip (01.07.2020, 5-6 pm MESZ) <br> Prof. Dr. Peter Hommelhoff

Controlling electrons on attosecond time scales - with a focus on the accelerator on a chip (01.07.2020, 5-6 pm MESZ)
Prof. Dr. Peter Hommelhoff

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Controlling electrons on attosecond time scales offers fascinating physics insights because electronic coherence is preserved on ultrafast times scales, even insight of solids. I will show a few examples along these lines and will then turn to how we can control free electrons on attosecond time scales with the help of nanophotonics, namely with our recent advances around the accelerator on a chip.
3D Laser Nanoprinting (15.07.2020, 5-6 pm MESZ) <br> Prof. Dr. Martin Wegener

3D Laser Nanoprinting (15.07.2020, 5-6 pm MESZ)
Prof. Dr. Martin Wegener

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This webinar follows a recently published review and perspectives article on 3D laser nanoprinting (V. Hahn et al., Opt. Photon. News 30(10), 28-35 (2019)). I will review the underlying physical principles, describe the state-of-the art in the context of many other alternative 3D additive manufacturing approaches, and emphasize two challenges: (i) Substantially faster and scalable 3D printing with sub-micrometer voxel sizes, and (ii) multi-material 3D nanoprinting. (i) I will present recent results of MPSP PhD student Vincent Hahn on rapid multi-focus 3D laser nanoprinting leading to printing rates around 10^7 voxels/s at sub-micrometer voxels sizes. For example, this has led to 3D mechanical metamaterials with more than 100 thousand unit cells and more than 300 billion voxels total. Furthermore, I will sketch our ideas to go well beyond this by introducing light-sheet 3D laser nanoprinting. (ii) I will discuss three different approaches towards multi-material architectures: (a) integrated microfluidic chamber, (b) stimuli-assisted 3D laser nanoprinting, and (c) meta-inks.
Ultrafast and ultrasmall: Attosecond chronoscopy and reaction nanoscopy (29.07.2020, 5-6 pm MESZ) <br> Prof. Dr. Matthias Kling

Ultrafast and ultrasmall: Attosecond chronoscopy and reaction nanoscopy (29.07.2020, 5-6 pm MESZ)
Prof. Dr. Matthias Kling

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One of the most fundamental processes in nature is light-induced photoemission of electrons. Attosecond chronoscopy with ultrashort laser pulses has revealed small but measurable delays in photoionization, characterized by the ejection of an electron upon absorption of a single photon. Ionization delay measurements in atomic targets provide a wealth of information about the timing of the photoelectric effect, resonances, electron correlations and transport. The extension of this approach to molecules, however, presents great challenges. In addition to the difficulty of identifying correct ionization channels, it is hard to disentangle the role of the anisotropic molecular landscape from the delays inherent to the excitation process itself. In the talk, I will show measurements of ionization delays from ethyl iodide around the iodine 4d giant dipole resonance employing attosecond streaking spectroscopy.
Improved Sensing of Circular Dichroism Using Dielectric Photonic Structures (12.8.2020, 5-6 pm MESZ) <br> Prof. Dr. Carsten Rockstuhl

Improved Sensing of Circular Dichroism Using Dielectric Photonic Structures (12.8.2020, 5-6 pm MESZ)
Prof. Dr. Carsten Rockstuhl

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Measuring the circular dichroism (CD), i.e. the differential absorption of left and right handed circularly polarized light, from a chiral molecular solution is a canonical method to distinguish the two different enantiomers. It is particularly important in pharmacy but also in other fields of science. However, as only the difference in absorption is measured, the signal is tiny and long integration times are needed. This is undesirable and many efforts are currently put in place to explore supporting photonic materials that enhance the CD signal. Here we summarize our recent efforts in this field. We argue that a suitable photonic structure should be (a) achiral, (b) helicity preserving, and (c) optically resonant. Only if the first condition is met, the CD signal depends on the chiral absorption properties of the molecule. If the second condition is met, the enhancement of the CD signal for a given ability of the structure to enhance the field is maximized. We show that suitably shaped dielectric discs perfectly accommodate all requirements [1]. Making cavities out of such material allows to obtain enhancement factors averaged across the cavity volume as large as 100 [2]. The maximum enhancement in some selected spatial locations can be even as large as 2000! [1]. Graf F. et al., ACS Photonics, (2019), 6, 482 [2]. Feis J. et al., Physical Review Letters, (2020), 124, 033201

MPSP Lunch/Coffee Break

Nicht nur unsere Fellows geben Einblicke in ihre Forschung - die "MPSP Lunch/Coffee Break" bietet Studierenden der Max Planck School of Photonics sowie externen Doktoranden die Möglichkeit zu einem virtuellen wissenschaftlichen Austausch.

Die MPSP Lunch/Coffee Break ist eine virtuelle Konferenz, bei der sich Menschen mit einer Leidenschaft für Physik und Photonik austauschen und kennenlernen können. In jeder Lunch Break gibt es ein oder zwei kurze Präsentationen von Doktoranden, Fellows, eingeladenen Spezialisten, Professoren etc. Am Ende können wir über die Themen diskutieren.

Die Themen der nächsten Lunch Break und den Registrierungslink finden Sie unten. Schreiben Sie uns bitte gerne zwei Wochen im Voraus, wenn Sie ihre eigene Arbeit vorstellen möchten, an photonics@maxplanckschools.de.

Nächste MPSP Coffee Break:  Montag, 06.07.2020,  5 pm (MEZ = UTC+2)

Nächste MPSP Coffee Break: Montag, 06.07.2020, 5 pm (MEZ = UTC+2)

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If you want to learn more about the topics of the next MPSP Lunch Break, visit our Social Media Channels:
Instagram: @mps.photonics
Facebook: maxplanckschools.of.photonics
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