Optical vortex phase plate on a fiber

Our optical vortex phase plate is fabricated directly on top of an optical fiber. This makes it extremely easy to use. No need for optical alignment or bulky free-space optics. Simply connect the fiber to your laser of choice and the output is a vortex beam!

optical vortex beam generator on fiber
SEM image of the fiber that generates an optical vortex beam
Spiral phase plate on fiber
SEM image of the spiral phase plate imprinted on a fiber

 

An optical vortex – also known as twisted light – is a special type of beam that carries orbital angular momentum. The phase of such beam changes with the azimuthal angle. As a result, in the center of a beam a phase singularity appears. The singularity leads to a characteristic donut-shape beam with a zero intensity on the axis. The two main features of the beam, angular momentum and donut shape, result in two types of applications. Angular momentum is used in telecommunications to transmit information or in optical trapping to rotate microparticles. Zero intensity at the axis is used in STED microscopy to achieve subdiffraction imaging. Typically, vortex beam is created using either bulky and expensive spiral phase plate or an even bulkier optical setup with a spatial light modulator. Instead, our approach is to use nanoimprint technology to fabricate spiral phase plate directly on the edge of the fiber.

Vortex phase plate on fiber specification:

Wavelength, nmBeam divergence full angle, degreesTopological chargeRefractive index of the phase plateFiberConnector
405 – 1550*3 – 151 – 41.51 – 1.70Single modeFC/PC, FC/APC

*Optical measurements are only available for 405-1100 nm wavelength range

By combining the vortex phase plate with our Fiber Collimator, we can control the beam divergence of the vortex beam that comes out of the optical fiber. Below you can see the far field from the fiber generating optical vortex with M=1 topological charge. The only difference between the fibers is the beam divergence. Choosing output angle of the beam makes it easy to match the vortex fiber with your optical setup.

Spiral phase plate far field
Far field output from a fiber with a regular spiral phase plate
Vortex collimator far field
Far field from a fiber with a vortex collimator lens
Focal spot from a fiber with vortex phase plate. The FWHM of the vortex fiber dark spot is 240 nm.
Focal spot from a fiber with vortex phase plate. The FWHM of the vortex fiber dark spot is 240 nm.

Applications of the optical vortex:

  • STED microscopy
  • Telecommunication
  • Optical trapping

Advantages of our vortex phase plate:

  • No optical alignment is necessary
  • Stability and reproducibility
  • Ease of integration
  • Small size

Download vortex phase plate specification

Contact us to purchase fiber vortex phase plate or to customize them for your application.