MF111_NTF

MF111_NTF - set of 10 SNOM probes, attached to tuning forks (quartz resonator on electrical plate holder), compatible with NT-MDT devices.

Material - single mode optical fiber Nufern 405HP.
Probe tip is coated by Al (70nm)/sublayer V (20nm) .
Tip diameter uncoated by Al (tip aperture) 50-100 nm (75±25)
Angle of fiber - about 20 degrees
Maximum optical input power - 400 microWatt
The probes are prepared by chemical etching method.
This method gives the optical efficiency 10² - 10⁴ times better than those obtained by mechanical pulling.

Geometrical & Mechanical fiber Specifications:

Clad Diameter	125.0 ± 1.5 µm
Coating Diameter	245 ± 15 µm
Core-Clad Concentricity	< 0.5 µm
Coating/Clad Offset	≤ 5 µm
Coating Material	UV Cured, Dual Acrylate
Operating Temperature	-55 to +85 °C
Short-Term Bend Radius	≥ 6 mm
Long-Term Bend Radius	≥ 13 mm
Proof Test Level	≥ 200 kpsi (1.4 GN/m²)

SNOM probe characteristics:

Characteristics	Probe type
Characteristics	MF111_NTF
Basic Nufern Fiber	405-HP
Operating wavelength, nm	400-550
Mode Field Diameter	3.5 ± 0.5 µm @ 515 nm
Second Mode Cut-Off, nm	370 ± 20
Optical efficiency for wavelength 530 nm	5x10^-6 - 5 x 10^-5
Optical efficiency for working wavelength	~ (10^-5- 10^-4)

SNOM probe's end

Probe tip with Al coating.

Aperture is 50-90 nm (70±20).