Global Patent Index - EP 1255971 A1

EP 1255971 A1 2002-11-13 - SHORT FABRY-PEROT FILTER WITH METALLIC LAYERS

Title (en)

SHORT FABRY-PEROT FILTER WITH METALLIC LAYERS

Title (de)

KURZER FABRY-PEROT-FILTER MIT METALLISCHEN SCHICHTEN

Title (fr)

FILTRE FABRY-PEROT COURT A COUCHES METALLIQUES

Publication

EP 1255971 A1 (FR)

Application

EP 01907709 A

Priority

  • FR 0100343 W
  • FR 0001871 A

Abstract (en)

[origin: WO0159415A1] The invention concerns a tuneable optical filter (1) of the short Fabry-Perot interferometer type with metal layers, designed to filter an electromagnetic radiation passing through it along a transverse direction ZZ' and whereof the wavelength spectrum is centred on a wavelength lambda o comprising two parallel plates (2, 4; 12, 14) separated from each other by at least one spacer (3; 10) such that there exists between said plates an air gap having a thickness e of the order of lambda o. The surfaces of the two plates facing each other respectively receive a lower (6) and an upper (7) metal layer. Tunability means (8, 9; 10, 18 19) designed to modify the air gap e are arranged between the plates to tune the filter. To obtain maximum transmission Tmax higher than 1 % and a width at mid-height DELTA lambda less than 80 mn in the wavelength domain ranging between 1.55 and 1.85 mu m centred on the wavelength lambda o substantially equal to 1.7 mu m, the metal layers (6, 7) are made from a metal selected among the group comprising tantalum and gold.

IPC 1-7 (main, further and additional classification)

G01J 3/26

IPC 8 full level (invention and additional information)

G01J 3/26 (2006.01)

CPC (invention and additional information)

G01J 3/26 (2013.01)

Citation (search report)

See references of WO 0159415A1

Designated contracting state (EPC)

DE FR GB IT NL

EPO simple patent family

WO 0159415 A1 20010816; AU 3561201 A 20010820; EP 1255971 A1 20021113; FR 2805052 A1 20010817

INPADOC legal status


2004-05-26 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION)

- Designated State(s): DE FR GB IT NL

2004-03-10 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20030802

2002-11-13 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020807

2002-11-13 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

2002-11-13 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI