25-06-18, 2:00 pm: Colloquium - Prof. Dr. Roman Schnabel:
'Gravitational-wave detection and the role of 100kg-sized crystalline-silicon mirrors'

 

On Monday, 25-06-18, 2:00 pm


Prof. Dr. Roman Schnabel

Institut für Laserphysik und Zentrum für Optische Quantentechnologien, Universität Hamburg


is holding a presentation on the topic:

"Gravitational-wave detection and the role of 100kg-sized
crystalline-silicon mirrors"


Abstract:
Heavy high-quality mirrors that are suspended as pendulums are a key ingredient of gravitational-wave (GW) detectors. All GW detectors today use Suprasil 3001 as the mirror substrate material. Future GW detectors will use cryogenically-cooled crystalline mirrors, most likely made from crystalline silicon. The international GW community, which consists of more than a thousand researchers, is highly interested in know-how about minimizing the optical absorption of crystalline silicon bulk and surface between 1.55µm and 2.1µm. We aim for less than a few ppm/cm, and an absorption of superpolished surfaces down to below 1ppm. Solving this challenge will strongly push the realization of the next-generation of GW detectors such as the European Einstein Telescope.


Guests are welcome to join.

 

Venue:

Leibniz-Institut für Kristallzüchtung

Raum 316, Geb. 19.31,

Max-Born-Str. 2

12489 Berlin-Adlershof

 

02-07-18, 2:00 pm: Colloquium - Prof. Dr. Brice Gautier:
'Gravitational-wave detection and the role of 100kg-sized crystalline-silicon mirrors'

 

On Monday, 02-07-18, 2:00 pm


Prof. Dr. Brice Gautier

INSA, Lyon


is holding a presentation on the topic:

"Nanoscale measurement of the electrical properties of ferroelectric thin films and crystals for the control and the engineering of domains and domain walls"


 

Abstract:

The goal of the presentation will be to present the research topics and past work from our INL team, in connection with ferroelectric materials, and also perspectives for the future. I will focus on results obtained with Piezoresponse Force Microscopy especially on the influence of water on the electrical properties of thin dielectrics and apparent growth speed of ferroelectric domains. Then I will switch on the limits of the PFM technique and development of new ways to assess ferroelectricity at the nanoscale based on current measurements. Eventually, I will present our projects around the control of ferroelectric domains and conductive domain walls.

Several words about the team :
Francis Calmon and I are the leaders of the "electronic devices" team of the Institute of Nanotechnology of Lyon. The team aims at studying and developing new types of transistors, memories and sensors in close collaboration with people involved in the microelectronics (including industrial partners like STMicroelectronics). My own work focuses on near field microscopies, and more precisely on the electrical measurement at the nanoscale using techniques derived from Atomic Force Microscopy (especially Conductive AFM, Piezoresponse Force Microscopy etc).

 


Guests are welcome to join.

 

Venue:

Leibniz-Institut für Kristallzüchtung

Raum 316, Geb. 19.31,

Max-Born-Str. 2

12489 Berlin-Adlershof

 

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