Planar Microlens Research Articles

Index profiling of distributed-index lenses by a shearing interference method

It is demonstrated that the transverse differential interference method is used as a reliable profiling technique for distributed-index rod lenses, and its accuracy and spatial resolution have been made clear. By the use of this technique the index profile of a distributed-index planar microlens which has 3-D index distribution has been measured.

Optical tap array using distributed-index planar microlens

The letter describes a novel optical tap array by using a two-dimensional array of planar microlenses. The present device is used to monitor a part of light which is transmitted through optical fibres. Planar microlenses to focus the light have been monolithically fabricated by the use of the electromigration technique; the focal length is 3 mm and NA is 0.15. The coupling efficiency of the initial device was 52% for coupling multimode graded-index fibres.

Distributed-index planar microlens array prepared from deep electromigration

Monolithic fabrication of a new distributed index planar microlens array by means of a deep electromigration technique in a glass substrate is reported. The array consists of distributed index lenses of 1.2 mm in diameter with 6.8 mm focal length. The focused spot is as small as 16 μm for λ=0.63 μm. The coupling efficiency of 60% to a multimode VAD fibre has been obtained.