Microprobe cantilever design:
The microprobes from the new 1550-X-series are our first probes which can be directly sampled by telecom-wavelength (1500 .. 1600 nm) laser pulses. They are sensitive to electric vector field-components oriented in transversal direction to the probe-tip axis as defined by the x-axis direction in the upper illustration. The model TD-1550-X-HR-WT offers good spatial resolution and clean spectral response due to our patent-pending internal absorber ("wave-trap") structures. The model TD-1550-X-HR-WT-XR provides increased mechanical robustness with only moderate loss of spatial resolution and sensitivity. It is designed for rougher applications e.g. where the sample distance is more difficult to control.
|Max. spatial resolution||40 µm (20 µm(#))||80 µm|
|Photo-switch gap size||1.5 µm||1.5 µm|
|Dark current @ 1 V Bias||< 4.5 µA||< 4.5 µA|
|Photocurrent @ 1 V Bias||> 12 µA (*)||> 12 µA (*)|
|Excitation wavelength||1500 .. 1600 nm|
|Average excitation power||1.5 .. 3.5 mW|
(*) For a focus diameter of circa 20 µm, bias voltage 1 V , average optical excitation power 3 mW.
(#) For front-switch instead of main-switch excitation. Front-switch excitation mode is showing reduced SNR.