Increasing the spatial resolution of direct laser writing of diffractive structures on thin films of titanium group metals

Victor P. Korolkov, Andrey G. Sedukhin, Dmitry A. Belousov, Ruslan V. Shimansky, Vladimir N. Khomutov, Sergey L. Mikerin, Evgeny V. Spesivtsev, Roman I. Kutz

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

6 Citations (Scopus)

Abstract

The important effects, techniques, and factors are considered that aim to increase the spatial resolution of a scanning direct laser writing of diffractive structures on thin films of transition metals from titanium group (Ti, Zr, and Hf). The writing process is based on metal oxidation under the thermal action of a tightly focused laser beam. Scanning speed of the laser beam and film thickness were varied to get a regime of through oxidation (TO) of the metal film under laser heating. It results in strong increase of the film transmission in exposed area. TO ensures a strong threshold due to feedback connected with decreasing of laser power absorption near center of focused gaussian laser spot. To the best of our knowledge, the direct laser writing of amplitude diffractive structures on Zr and Hf films were performed for the first time. The new regime of direct laser writing on thin Zr films was revealed. It allows forming tracks with width of 100 nm and less at laser spot diameter of 700 nm and laser wavelength of 532 nm. In this work, the spectral dependence of the refractive index and extinction coefficient of hafnium films was first experimentally determined in the wavelength range of 250-1100 nm.

Original languageEnglish
Title of host publicationHolography
Subtitle of host publicationAdvances and Modern Trends VI
EditorsAntonio Fimia, Miroslav Hrabovsky, John T. Sheridan
PublisherSPIE
ISBN (Electronic)9781510627260
DOIs
Publication statusPublished - 1 Jan 2019
EventHolography: Advances and Modern Trends VI 2019 - Prague, Czech Republic
Duration: 1 Apr 20194 Apr 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11030
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceHolography: Advances and Modern Trends VI 2019
CountryCzech Republic
CityPrague
Period01.04.201904.04.2019

Keywords

  • direct laser writing
  • thin metal films
  • metal-oxide mask
  • spatial resolution
  • amplitude diffractive structures
  • thermochemical laser writing
  • through oxidation
  • titanium group metals
  • OPTICAL-CONSTANTS
  • OXIDATION
  • TI

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