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OptiLayer:  Your Partner in Design and Post-Production Characterization of Optical Coatings


 Needle Optimization

Needle optimization is a unique feature of OptiLayer, it is especially useful for solving complicated design problems.  Needle optimization is a process in which new layers are inserted into the design being optimized.  In automatic mode, the best place to insert a new layer is found automatically. An optimal thickness for the new layer is computed by a special OptiLayer procedure.

When the number of coating materials exceeds two, an optimal material is chosen among all materials automatically in the most optimal way.

After the insertion of each new layer, the number of layers in the stack is generally increased by two, i.e., a single layer has been divided into two pieces separated by a "new" thin layer which was inserted in it.  The resulting stack is then refined by one of the available optimization algorithms.

OptiLayer exploits the needle optimization technique in its genuine form. This technique is based on complicated mathematical ideas and computational algorithms. You can refer to the book "Basics of Optics of Multilayer Systems" by Sh.Furman and A.Tikhonravov for its detailed description.

Manual Needle Optimization mode assumes experience in optical coating design and used typically for solving complicated design problems. 


needle optimization

needle optimization

See also our videos at YourTube YouTube:

  1. Sh. Furman and A.V.Tikhonravov, "Basics of optics of multilayer systems", Editions Frontiers, Gif-sur Yvette, 1992, 242 p.
  2. A. V. Tikhonravov, M. K. Trubetskov, and G. W. DeBell, "Optical coating design approaches based on the needle optimization technique," Appl. Opt. 46, 704-710 (2007).
  3. A. V. Tikhonravov and M. K. Trubetskov, "Modern status and prospects of the development of methods of designing multilayer optical coatings," J. Opt. Technol. 74, 845-850 (2007).
  4. A. Tikhonravov and M. Trubetskov, "Modern design tools and a new paradigm in optical coating design," Appl. Opt. 51, 7319-7332 (2012).
  5. A. V. Tikhonravov, M. K. Trubetskov, and G. W. DeBell, "Application of the needle optimization technique to the design of optical coatings," Appl. Opt. 35, 5493-5508 (1996).
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Easy to start

Icons 100x100 1OptiLayer provides user-friendly interface and a variety of examples allowing even a beginner to effectively start to design and characterize optical coatings.        Read more...

Docs / Support

Icons 100x100 2Comprehensive manual in PDF format and e-mail support help you at each step of your work with OptiLayer.



Icons 100x100 3If you are already an experienced user, OptiLayer gives your almost unlimited opportunities in solving all problems arising in design-production chain. Visit our publications page and challenge page.


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