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1. (WO2013114075) SUPER-OSCILLATORY LENS DEVICE

Pub. No.:    WO/2013/114075    International Application No.:    PCT/GB2013/050114
Publication Date: Fri Aug 09 01:59:59 CEST 2013 International Filing Date: Sat Jan 19 00:59:59 CET 2013
IPC: G02B 27/58
G02B 27/44
Applicants: UNIVERSITY OF SOUTHAMPTON
Inventors: ZHELUDEV, Nikolay Ivanovich
SAVO, Salatore
ROY, Tapashree
SAVINOV, Vassili
DENNIS, Mark
ROGERS, Edward Thomas Foss
LINDBERG, Jari
Title: SUPER-OSCILLATORY LENS DEVICE
Abstract:
A super-oscillatory lens (10) having a pre-defined pattern to spatially modulate the light beam in amplitude and/or phase which has a blocking element (6) formed integrally with the lens, or as a separate component adjacent to the lens, which is opaque to the light beam to cause diffraction of the light beam around the blocking element and formation of a shadow region (20). The lens and blocking element focus the light beam to form an elongate needle-shaped focus (15) in the shadow region (20). In any application in which it is necessary to scan a small spot over a surface, compared with a conventional objective lens focus the elongate shape of the focus relaxes the requirement on a feedback loop to maintain a constant separation between a scan head and a surface being scanned. The elongate shape is also ideal shape for materials processing applications.