Michael Helgert
Overview
Explore the profile of Michael Helgert including associated specialties, affiliations and a list of published articles.
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Articles
8
Citations
21
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Recent Articles
1.
Schulze M, Damm M, Helgert M, Kley E, Nolte S, Tunnermann A
Opt Express
. 2012 Oct;
20(16):18348-55.
PMID: 23038385
We fabricated stochastic antireflective structures (ARS) and analyzed their stability against high power laser irradiation and high temperature annealing. For 8 ps pulse duration and 1030 nm wavelength we experimentally...
2.
Weber T, Kasebier T, Helgert M, Kley E, Tunnermann A
Appl Opt
. 2012 Jun;
51(16):3224-7.
PMID: 22695553
In this paper, we present a broadband wire grid polarizer with a spectral working range down to a wavelength of 193 nm. Tungsten is chosen as grating material because it...
3.
Pacholski C, Morhard C, Spatz J, Lehr D, Schulze M, Kley E, et al.
Appl Opt
. 2012 Jan;
51(1):8-14.
PMID: 22270407
Antireflective subwavelength structures (ARS) resembling nanostructures found on the cornea of night-active insects reduce the reflection of light by providing a gradual change in the refractive index at the interface....
4.
Lehr D, Helgert M, Sundermann M, Morhard C, Pacholski C, Spatz J, et al.
Opt Express
. 2010 Dec;
18(23):23878-90.
PMID: 21164733
Laterally structured antireflective sub-wavelength structures show unique properties with respect to broadband performance, damage threshold and thermal stability. Thus they are superior to classical layer based antireflective coatings for a...
5.
Szeghalmi A, Sklarek K, Helgert M, Brunner R, Erfurth W, Gosele U, et al.
Small
. 2010 Nov;
6(23):2701-7.
PMID: 21069891
A flexible, nondestructive, and cost-effective replication technique for nanostructures is presented. The advantages of the process are: 1) it allows for tailoring structural parameters of the replica (e.g., line width)...
6.
Morhard C, Pacholski C, Lehr D, Brunner R, Helgert M, Sundermann M, et al.
Nanotechnology
. 2010 Sep;
21(42):425301.
PMID: 20858934
Antireflective surfaces composed of biomimetic sub-wavelength structures that employ the 'moth eye principle' for reflectance reduction are highly desirable in many optical applications such as solar cells, photodetectors and laser...
7.
Szeghalmi A, Helgert M, Brunner R, Heyroth F, Gosele U, Knez M
Appl Opt
. 2009 Mar;
48(9):1727-32.
PMID: 19305471
Al(2)O(3) and TiO(2) thin films have been deposited on Si wafers, quartz, BK7 glass, and polycarbonate substrates by atomic layer deposition (ALD). The refractive indices and growth rates of the...
8.
Lohmuller T, Helgert M, Sundermann M, Brunner R, Spatz J
Nano Lett
. 2008 Apr;
8(5):1429-33.
PMID: 18412400
We report an innovative approach for the fabrication of highly light transmissive, antireflective optical interfaces. This is possible due to the discovery that metallic nanoparticles may be used as a...