[OPTICAL REVIEW Vol. 10, No. 4 (2003) 241-245]
© 2003 The Optical Society of Japan

Miniaturisation of High-NA Objectives for Optical Recording

Benno H. W. HENDRIKS, Marco A. J. VAN AS and Pascal J. H. BLOEMEN1

Philips Research Laboratories, Prof. Holstlaan 4, 5656 AA Eindhoven, The Netherlands
1Philips Lens Technology Center, Zwaanstraat 2a, 5600 JB Eindhoven, The Netherlands

(Received February 12, 2003; Accepted May 27, 2003)

High-NA objectives for optical recording have received a lot of attention due to the investigation of the Blu-ray Disc system. More recently to enable optical storage in portable devices, small building height optical drives have been studied requiring miniaturised high-NA objectives. Previously reported miniaturised objectives consist of two elements and are, therefore, less suited for mass production. In this paper the design and manufacturing of a miniaturised single element high-NA objective is reported. Furthermore, with the aid of non-periodic phase structures the tolerances of the objectives can be further expanded.

Key words: high numerical aperture, miniaturisation, optical recording, non-periodic phase structures