Photoconductive THz near-field detector

TeraSpike
TD-800-Z

A near-field microprobe sensitive to THz field components longitudinal to the tip axis — with 8 µm spatial resolution. Together with the X-series it gives access to the field polarization in all three dimensions.

Request a quote Technical data
Cantilever design · Z-series Z-SERIES
Z-series cantilever design: LT-GaAs tip with photo-switch electrodes arranged for the longitudinal field component.
8 µm
Max. spatial resolution
700–860 nm
Excitation wavelength
Longitudinal (z)
Field sensitivity
Probe design & specifications

Out-of-plane fields, resolved.

Each probe is individually tested and ships with a manual and test certificate.

Two tip options

  • N — no resonant antenna element; somewhat higher bandwidth, photo-switch gap 2 µm.
  • A-500G — integrated antenna element for enhanced sensitivity around 0.5 THz, gap 5 µm.
  • Both options resolve 8 µm and run on standard 700–860 nm femtosecond lasers.
  • Available with the wave-trap (WT) and robust XR cantilever options.

Z-series probes detect the field component along the probe-tip axis (z). In the standard configuration the probe stands perpendicular to the sample, so z is the out-of-plane field — the component that X-series probes cannot see.

Technical data

ParameterNA-500G
Max. spatial resolution8 µm8 µm
Photo-switch gap size2 µm5 µm
Dark current @ 1 V bias< 0.4 nA< 0.4 nA
Photocurrent @ 1 V bias> 0.1 µA> 0.2 µA
Excitation wavelength700–860 nm700–860 nm
Average excitation power0.1–4 mW0.1–4 mW
Connection typeSMPSMP
Where it's used

Completing the field picture.

Terahertz research

Metamaterials & resonators

Map the z-component of resonant surfaces, where the strongest near-field often points out of the plane.

Metamaterials & plasmonics →
Guided waves

Waveguide mode profiles

Image guided THz modes on planar metal and dielectric waveguides with low invasiveness.

On-chip spectroscopy →
Ready to specify

Request a TD-800-Z quote.

Tell us your excitation source and target frequency range — we'll recommend N or A-500G and the right options.

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