attoCFM I rotation
free-beam rotational confocal microscope
sphere of confusion always within the field of view
easy retrieval of region of interest for ± 90° rotation
cryogenic high-NA apochromatic objectives
broadband collection with low focal displacement
free-beam Faraday and Voigt geometry available
benefiting from high in-plane magnetic fields
The attoCFM I rotation is a confocal microscope that integrates a nanorotator and a 9-3 T vector magnet. Via in-situ sample rotation, with minimal wobble and run-out, one gets full access to strong in-plane field (3 T) in arbitrary direction and at low cost. 2D magnets typically have higher in-plane magnetic field than 3D magnets, and are also cheaper, which comes as a double benefit for users.
Moreover, even when very high in-plane field (9 T) is required in experiments, one can easily switch from the Faraday configuration to the Voigt configuration and thus utilize the 9 T field in the sample plane, in z-direction.
The attoCFM I rotation has been developed to offer a maximum flexibility for a convenient adaption to a large number of different applications in magnetooptics and quantum optics. This is realized by an external optics head, positioned outside the cryostat. The free-beam optical design allows for completely independent adjustment of the excitation and collection port.
The easy handling opens up new possibilities in quantitative surface characterization in the sub-micron range. All parts of this confocal microscope are non-magnetic, and are compatible with dry cryostats attoDRY1000 and attoDRY2100.
Proof-of-principle measurement
The measurement exemplifies Excursion of the region of interest (ROI) over the ± 90° rotation.
Specifications
| General Specifications | |
|---|---|
| type of instrument | free-beam rotational confocal microscope with room temperature optics head and cryogenic objective |
| sensor head specifics | unique low temperature compatible achromatic objectives with high numerical aperture, optimized for different wavelength ranges |
| rotator | ANR240 RES+, max. rotation ± 90° |
| sphere of confusion | < 1/2 FOV (for rotation of ± 90°) |
| Confocal Unit | |
| configuration | compact and modular design, two or more optical channels; standard configuration: one excitation and one detection channel |
| key benefits | quick and reliable alignment of each channel, steering mirror for combined beams long-term stability |
| quick-exchange of optical components | beamsplitters, filter mounts for up to 4 filters/polarizers, (1" diameter); optional piezoelectric rotator with filter mount |
| pinhole configuration | two pinholes (fiber apertures), different illumination and collection wavelength possible |
| pinhole size | dependent on fibers, typically 3 .. 9 µm mode field diameter |
| compatible LT-objective | LT-APO/VIS, LT-APO/VISIR, LT-APO/NIR (see accessory section for more information) |
| inspection unit | sample imaging with large field of view: ~54 µm (attoDRY) |
| Illumination | |
| excitation wavelength range | 650 nm |
| illumination port specification | FC/ APC-connector for single mode fibers or free-beam configuration |
| Detection | |
| detection mode | e.g. reflection, luminescence, fluorescence, Raman (optional) |
| detection wavelength range | detector upon user`s choice, typically Si detector (coupling of the light to other detectors) |
| detection port specification | FC/ APC-connector for single mode fibers or free-beam configuration |
| transmission option | low temperature compatible detector below the sample for transmission measurements (intensity) |
| Sample Positioning | |
| total travel range | 5 x 5 x 4.8 mm³ (closed loop, resistive encoder, sensor resolution approx. 200 nm, repeatability 1-2 µm) |
| sample holder | ASH/QE/8/CFM quick exchange sample holder and integrated heater with calibrated temperature sensor |
| step size | 0.05 .. 3 µm @ 300 K, 10 .. 500 nm @ 4 K |
| Suitable Operating Conditions | |
| temperature range | 1.8 K .. 300 K (dependent on cryostat); mK compatible setup available on request |
| magnetic field range | 0..12 T (dependent on magnet) |
| operating pressure | designed for He exchange gas (vacuum compatible version down to 1E-6 mbar on request) |
| Suitable Cooling Systems | |
| titanium housing diameter | 48 mm |
| bore size requirement | designed for a 2" (50.8 mm) cryostat/magnet bore |
| compatible cryostats | attoDRY1000/2100 |
| Compatibility with Electronics | |
| scan controller and software | ASC500 basic (optional; for detailed specifications please see attoCONTROL section) |
| laser | LDM600 laser/detector module (for detailed specifications please see attoCONTROL section) |
| Options and Upgrades | |
| fine scan range | 5 x 5 x 4.8 mm³ (closed loop, resistive encoder, sensor resolution approx. 200 nm, repeatability 1-2 µm) |
| ultra-large scan range upgrade | 80 x 80 µm² @ 300 K, 125 x 125 µm² @ 4 K |
| in-situ inspection optics | incl. with CFM I external optics head |
| sample holder upgrade | ASH/QE/4TP quick-exchange sample holder (8 electrical contacts, integrated heater & T-sensor); available only in combination with scanners |
| Voigt geometry upgrade | optional scanner for Voigt & Faraday geometry |
