Preparation of high energy throughput SNOM probes

• In this technical note we present technological steps of fabrication of high energy throughput SNOM probes. The core-metal coating interface of probes is corrugated what enhances photon-to-plasmon coupling. A strong evanescent field allows for reduction of aperture diameter, which together with skin depth of metal used for coating decide upon resolution. Probes are made of Ge-doped silica glass fibre, which is hydrogenated to increase its photosensitivity. A Bragg grating is recorded in the cores with UV light diffracted into +1 st/1st diffraction orders on a sinusoidal phase mask. Modulation of the refractive index is connected with different etch rates. Etching with the Turner method is made in aqueous solution of HF acid. A corrugated tapered fibre is then coated with aluminium in a special rotating holder. We present results of this novel multi step technology.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Annan teknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Other Engineering and Technologies (hsv//eng)

Nyckelord

SNOM

Coating interfaces

Refractive index

Corrugated metal

resolution

Aperture diameter

Hydrofluoric acid

High energy

Ge-doped silica

Silica

Skin depth

Metal coatings

Technical notes

Protective coatings

Bragg gratings

Fiber optic networks

Metals

Etch rates

Multi-step

Diffraction orders

aperture metal-coated probes

HF acid

Probes

Germanium

Bragg grating

Phase masks

Evanescent fields

High energy physics

Transparent optical networks

Doping (additives)

corrugated tapered probes

Glass fibers

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