You are invited to attend a lecture

(Selected) Frontiers in plasma science

:By

Shurik Yatom

Princeton University, Princeton Plasma Physics Laboratory

Abstract

Plasma is a partially of fully ionized gas, comprising the 99 % of the visible matter in the universe. The physical plasma is scarce in nature on Earth, however is continuingly gains popularity in the science and technology fields, since being described by Langmuir in 1920s. Currently, multiple directions of plasma related research are prominent in a variety of scientific and technological fields: from the quest for fusion energy, through plasma propulsion for space-travel, to plasma medicine, agriculture and material fabrication and functionalization.  The potential for applications is indeed vast, however so are the scientific challenges that emerge in the context of the above applications. In this talk I will concentrate on two exciting areas: plasma-assisted synthesis of nanomaterials and the plasma interactions with liquids, biological tissues and cells. Both of these research areas are incredibly complex, owing to multiple different interacting species with a wide variety of energies, sizes and chemical potentials, interacting across all the possible phases of matter, from gas to liquid, solid and crystal phases, presenting many exciting physical challenges. Notably, both these areas consider multiphase environment, posing many scientific challenges, such as: large density and temperature, unknown plasma characteristics, the control of the reactivity transfer at the plasma–liquid/solid interface, interfacial charging, droplet transport and self-organization of plasmas in contact with liquid/solid. Similar challenges occur in the interface of plasma with biological tissues and cells. The phenomenon of plasma self-organization into coherent structures and patterns is particularly interesting, because it modulates the characteristics of the plasma, influencing the density and the energy of the charged particles, chemical composition, species transport along and across the plasma-tissue/liquid interface, radiation and electric fields. The aim of this seminar is to introduce these selected frontiers of plasma science, discuss their promise, challenges and the experimental approach to their investigation.

On Thursday, Nov 22, 2018, 15:00

Room 011, Kitot building

You are invited to attend a lecture

Chip-scale metrology: taming atoms, frequency combs and cavities

:By

Liron Stern

National Institute of Standards and Technology (NIST), Time & Frequency division, 325 Broadway Boulder CO, USA

Metrology, the science of measurement, strives to push the limits of human ability to measure quantities such as time, frequency, distance, temperature and mass. This ongoing global effort provides us with a reference “ruler” which is crucial both for understanding the fundamental nature of our universe, as well as an enabling and driving new technologies. Central to such measurements are quantum sensors, such as atomic clocks, magnetometers and superconducting voltage standards which are continuously driving today’s technological revolutions. Nowadays, we are witnessing a universal endeavor to miniaturize such “measuring machines” with two prime motivations: understanding the fundamentals of light-matter interactions at these extreme limits, and enabling new applications in disciplines such as telecommunication, space exploration and medical devices.

In this talk, I will present how we move forward to enable chip-scale frequency metrology. First, I will introduce the recently discovered microresonator based Kerr-soliton frequency combs, and experiments and calculations where we have used these as a spectroscopic tool to directly interact with atomic vapour. I will present experimental results where we construct a new type of micro-machined atomic vapour cells where diffractive optics are merged with atomic physics. I will describe how these devices map atomic states to the spatial distribution of diffracted light, and how we can utilize these effects to allow offset frequency locks with high stability. Finally, I will present a miniaturized cavity with a quality factor of a billion, interfaced with an atomic micromachined atomic cell, providing ~100 Hz of linewidth and stable optical frequency. To conclude, I will show how interfacing atoms, Kerr-combs, and miniaturized cavities paves the way to a fully chip-scale metrology system, and discuss the huge impact such system may cast on science and technology.

On Sunday, November 18, 2018, 13:00

Room 011, Kitot building

סיור במעבדות של אימפקט לאבס

Impact Labs  

מעבדת המייקרים הגדולה בישראל, פועלת בשיתוף פעולה עם WeWork  

מאפשרת לחבריה בחלל של 1000 מ"ר, גישה ותמיכה לטכנולוגייתhigh end 

ניפגש ביום שני 17.12.18

18:45-19:15 התכנסות, מינגלינג ובו זמנית יועברו סיורים במקום

בהמשך הערב הכרות והסבר על  IMPACTLABS והרצאה בנושא 

פיתוח אבות טיפוס (Prototypes)

זמן משוער לסיום 20:45

לפרטים והרשמה לחצו כאן