SPM Systems with more than one probe that can image independently have always been a dream.This dream has become a reality with the MultiView 4000™ with its AFM, NSOM and SPM multiprobe capabilites and it's optical and electron optical compatibility.
Four probes operate simultaneously and independently, with each probe having its own feedback and scanning capabilities. Measure sophisticated properties only possible with the availability of multiple probes such as electrical, thermal and optical properties of devices. The MultiView 4000 is a novel platform containing multiple probes/AFMs for advanced experiments such as: nanoscale transport, optical pump-probe, and read-write experiments.
The MV 4000 continues the tradition of the MV series, providing total optical flexibility and customization possibilities. Now, AFM Raman and Tip Enhanced Raman Spectroscopy (TERS) can be integrated with the multiprobe capability. In addition, free optical access from above allows easy visualization of all probes and facilitates nanomanipulation.
- Independent scanning of up to four probes for atomic force, near-field optical and all known probes for scanned probe imaging modes
- Unique probes for multiple probe resistance measurements with two, three and four point probe geometries
- Unique thermal probes for multiple probe measurements
- Multiple probe near-field optical (NSOM or SNOM) measurements
- Multiple probe nanochemical writing on a variety of structures with a variety of gaseous, liquid or solid inks with Fountain Pen NanochemistryTM
- Multiple probe nanoindentation with on-line ultra high resolution atomic force imaging of the indented structure
- Multiple probe optical or thermal desorption with tandem collection for mass spectral analysis
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The simultaneous and independent SPM probe operation of up to 4 probes enables full characterization of all dimensions of samples and devices. All forms of SPM are enabled for each individual probe accompanied by total optical integration resulting in access to all modes including AFM, KPM, EFM, ANSOM, NSOM, STM, AFM-Raman, and TERS. Because these probes are designed for multiple probe operation, they can be brought to a nanometric separation distance thus ensuring that the same area is scanned with all the probes.
Multiprobe capability is especially useful for electrical measurements since multiple probes can now be placed over the element to provide bias or probe its conductivity, resistance, etc just like in a probe station.
Two-, three-, or four-point resistance measurements are possible. Multiple probes also enable flexible positioning and manipulation to provide bias, localized I-V measurements, and multichannel imaging.
One probe can be the source of excitation while the second probe follows the transport process with high spatial resolution. Alternatively, optical pump/probe experiments can now be performed using one probe to optically pump while the other probe measures the optical output in a variety of configurations. An example of each type of measurement is shown below.
Thermal transport measurement within an SRAM device where heat is introduced at specific locations and detected at other locations. As contact is made in different regions of the SRAM with the thermal conductivity probe, the probe tip cools to different levels depending on the material's thermal conductivity. The resulting image is obtained by determining the current alterations that had to to be affected in order to keep the current flowing past the point resistance at a constant value.
With two cantilever, near-field optical probes with exposed tips, light is injected through one probe and is guided through the sample which is a fiber. With the second probe in place, this injected light can be collected and analyzed both spatially and temporally. In this image two NSOM probes are seen in AFM contact with the input and output of the fiber waveguide.
See a video showing an example using multiprobe technology to conduct nanothermal measurements here.
With a multiprobe system, resolution and tip quality no longer need to be compromised since each probe is now individualized for each measurement. In classic NSOM setups the NSOM probe would have the dual function of imaging topography and fluorescence where the topography image is compromised by the aperture (wider diameter) needed by the NSOM probe. But in a multiprobe setup, a standard SPM probe can be used the topography without affecting the NSOM fluorescence measurement.
The left and center images are the topography and fluorescence images, respectively, of lumogen dye particles collected in a multiprobe setup with different probes for topography and NSOM. The image on the right is the topography image of the same sample but collected with the NSOM probe, revealing the clear loss of resolution and morphology. The width of each image is 8um.
One probe can be used for moving, cutting, or positioning a sample, while the other probe can be used to image the sample. For example, shown below is a chromosome that has been dissected with one probe (see image on left), while the other probes images the result of the nanomanipulation.