Nano-Optics for Molecules on Chips

Nano-Optics for Molecules on Chips

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Description: With a goal to gain control of cold molecules in single quantum states realized by means of integrated electric, magnetic, radio frequency, micro wave and optical fields. These are the Strategies that will be used to obtain that goal: 1) Electrostatic deceleration of molecular beams 2) Association of precooled atomic samples 3) Long term storage in integrated magnetic microtraps 4) Detection and addressing via integrated nano-optical elements .

 
Author: Cataliotti (Fellow) | Visits: 1351 | Page Views: 1352
Domain:  High Tech Category: Semiconductors 
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Short URL: http://electronics.wesrch.com/pdfEL1SE1000XKYO

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Contents:
ICT-2007.8.1 Nano-scale ICT devices and systems

NanoNano-Optics for Molecules on Chips

CHIMONO
Fritz-Haber-Institut der Max-Planck-Gesellschaft Universit�t Bonn Johannes Gutenberg-Universit�t Mainz

CHIMONO
ICT-2007.8.1 Nano-scale ICT devices and systems Goal: Control of cold molecules in single quantum states realized by means of integrated electric, magnetic, radio frequency, micro wave and optical fields Strategies: 1 Electrostatic deceleration of molecular beams 1 Association of precooled atomic samples 2 Long term storage in integrated magnetic microtraps 3 Detection and addressing via integrated nano-optical elements

Fritz-Haber-Institut der Max-Planck-Gesellschaft
Design of microstructured Stark decelerator on a chip capable of:
� decelerating polar molecules directly from a pulsed supersonic nozzle beam to standstill � maintaining three dimensionally confined bunches during deceleration � guiding and keeping the bunches of molecules in traps above a chip

CHIMONO
ICT-2007.8.1 Nano-scale ICT devices and systems

Realization on glass or silicon
�Fabrication of various designs in collaboration with TUW and JOGU MAINZ �Development and manufacture of waveform generator producing harmonic potentials from about 3 MHz down to DC up to 300 V peak to peak �Test and characterization of the chip via TOF and PMT using metastable CO molecules in proof of principle experiment

CHIMONO
ICT-2007.8.1 Nano-scale ICT devices and systems

Cryogenic buffer-gas source

Task 1: Formation of cold molecules in single quantum states

Electrostatic deceleration
re nt de ns it

Tuneable optical cavity
w ire

Task 2: Detection of single molecules
Integrated cavity-based single-molecule detectors

ig h

cu r

y

Integrated optical waveguide

Electrostatic comb drive

H

cold atom de Broglie waveguide

cold molecules

Common substrate

Task 3: Long term storage of single molecules and ensembles

CHIMONO
ICT-2007.8.1 Nano-scale ICT devices and systems

Present core expertise of the group is based on: Double well matter wave interferometer
b� adiabatic RF potenials

Micro-optics on the AtomChip
for detection and preparation of quantum states

AtomChip fabrication
� double layer structure � semiconductor structure � access to superconducting technology

interference of two BECs

fluorescence fiber detector

AtomChip with double layer structure

CHIMONO
ICT-2007.8.1 Nano-scale ICT devices and systems

�Implement an atom chip based degenerate mixture of Rubidium and Potassium.

�Investigate different routes (photoassotiation and/or Feshbach resonances) to polar Rb-K ground state molecules (with Imperial).

�Investigate the possibility to use the very strong RF and MW near fields to assist in molecular formation and transfer to the ground state (with TUW).

CHIMONO
ICT-2007.8.1 Nano-scale ICT devices and systems

Quantum interface between cold atoms or molecules and solid state quantum systems: A new experiment will be set up to combine a ultra cold source of atoms (87Rb) or molecules. One of the first tasks will be to establish an apparatus that should allow us to create a sizeable BEC atom chip, as close to a cryogenic surface where a superconducting device can be mounted. Starting from a 4K experiment, the design should allow us to reach the interesting temperature domain of superconducting devices, below 1K. Superconducting microwave resonators will allow quality factors >105 and low noise operation.

A. Wallraff et al, Nature 431, 2004

Existing superconducting devices Possible superconducting resonator on the atom chip in order to couple microwaves to corresponding molecule transitions

Johannes Gutenberg-Universit�t Mainz Universit�t Bonn

CHIMONO
ICT-2007.8.1 Nano-scale ICT devices and systems

Spectroscopy of Thin Molecular Films

PTCDA

F. Warken et al., Opt. Express 15, 11952 (2007).

Johannes Gutenberg-Universit�t Mainz Universit�t Bonn

CHIMONO
ICT-2007.8.1 Nano-scale ICT devices and systems

Sensitivity

� Spectroscopy of less than 1 % of a closed monolayer of molecules with excellent S/N. Realistic limit: 1�100 molecules at ambient conditions! � Sensitivity much higher for laser cooled atoms or molecules at cryogenic temperatures:
10%

90%

100%

G. Sagu� et al., Phys. Rev. Lett., in press (2007).

CHIMONO
ICT-2007.8.1 Nano-scale ICT devices and systems Foreseen Outcome: � Development of "MoleculeChip" the molecular analogue of "AtomChips" developed in FP6 Long Term Goals:
1. Ultimate precision/control of a single atom or molecule functionality, control of the connectivity and of addressability of a single atom/molecule. Control of state and conformation, where the conformation is connected to the function. 2. An appropriate technology to exchange energy, data and instructions within a single atom or molecule and between different atoms or molecules 3. Control and synthesis down to the sub-nano scale, constructing the system oneby-one from atomic and molecular building blocks

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