Polarization-sensitive multilayer diffractive structures for document security

2009 ◽  
Author(s):  
Ivo Aubrecht
Keyword(s):  
Document Security ◽  
Diffractive Structures

Diffractive structures holographically recorded in amorphous hydrogenated carbon (a-C:H) films

1997 ◽  
Vol 22 (23) ◽  
pp. 1805 ◽  
Author(s):  
Carlos R. A. Lima ◽  
Leandro L. Soares ◽  
Lucila Cescato ◽  
Marco A. R. Alves ◽  
Edmundo S. Braga
Keyword(s):  
Diffractive Structures ◽  
Amorphous Hydrogenated Carbon

Document Security in the Ancient World

2011 ◽  
pp. 150-156
Author(s):  
Christopher H. Walker
Keyword(s):  
Information Science ◽  
Ancient World ◽  
Cyber Terrorism ◽  
Security Issues ◽  
Document Security ◽  
Information Professionals

While issues of encryption, firewalls, surveillance technologies, and cyber terrorism occupy the day-to- day thoughts of contemporary practitioners on the frontiers of information science, the essential problems they face are old, not new. The concept of document security goes back to some of the earliest eras from which writing survives. Testimony to the efforts of information professionals confronting security issues in the ancient world can be found in business, government, family, and temple contexts.

Pulse delay at diffractive structures under resonance conditions

1998 ◽  
Vol 23 (17) ◽  
pp. 1337 ◽  
Author(s):  
Frank Schreier ◽  
Martin Schmitz ◽  
Olof Bryngdahl
Keyword(s):  
Pulse Delay ◽  
Diffractive Structures

Graded-index diffractive structures fabricated by thermal ion exchange

1997 ◽  
Vol 36 (10) ◽  
pp. 2048 ◽  
Author(s):  
Risto-Pekka Salmio ◽  
Jyrki Saarinen ◽  
Jari Turunen ◽  
Ari Tervonen
Keyword(s):  
Ion Exchange ◽  
Graded Index ◽  
Diffractive Structures

Optical memories for document security

1996 ◽  
Author(s):  
Wayne R. Tompkin ◽  
Rene Staub ◽  
Jean-Frederic Moser
Keyword(s):  
Optical Memories ◽  
Document Security
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