Use Of Fiber-optic Components Research Articles

Laser Interference Nanolithography with a 405nm Fiber Semiconductor Laser

This paper presents a method of laser interference nanolithography for the formation of interference patterns on the resist using a fiber semiconductor laser with a wavelength of 405nm. In the method, surface pattern structures are fabricated through the control of the incident angles of two interfering beams, the exposure dose of laser radiation and the development time. The angle adjustment becomes more convenient and the influence of environmental variations on the system has been reduced due to the use of fiber optic components. In the work, a feature size of down to 63nm and a pattern period of 215nm were achieved. The experimental results have shown that the method can be used for low cost micro and nano fabrication of periodical surface patterns with the features of low cost, simplicity and flexibility.

Transmission medium and full fiber-optic setup for quantum key distribution applications

A fiber-optic-based coupled waveguide transmission medium is proposed to distribute secret keys in a single-photon polarization-based quantum cryptography setup. Polarization maintenance properties and coupling phenomena of the transmission medium are exploited to achieve accuracy and security of the transferred key. Elliptic fibers and fiber couplers are used to prepare the transmitted photons at the sender as well as analyze them at the receiver. The uniqueness of the setup stands on the exclusive use of fiber-optic components, enabling its construction on a single fiber line.

Raman spectroscopy with a fiber-optic probe

Considerations affecting the use of fiber-optic components in Raman measurements for quantitative analysis are described. Bidirectional single-fiber probe systems and a unidirectional multi-fiber probe are compared. Results are given for a system employing a 1 × 6 bifurcated probe. In situ monitoring of a reaction for formation of a conducting polymer, polypyrrole, is described. A spatial averaging advantage for the fiber-optic system in measurements on solid samples is described, and results for some purine and pyrimidine mixtures are reported.