Air-suspended TiO2-based HCG reflectors for visible spectral range
Paper i proceeding, 2015

For GaN-based microcavity light emitters, such as vertical-cavity surface-emitting lasers (VCSELs) and resonant cavity light emitting diodes (RCLEDs) in the blue-green wavelength regime, achieving a high reflectivity wide bandwidth feedback mirror is truly challenging. The material properties of the III-nitride alloys are hardly compatible with the conventional distributed Bragg reflectors (DBRs) and the newly proposed high-contrast gratings (HCGs). Alternatively, at least for the top outcoupling mirror, dielectric materials offer more suitable material combinations not only for the DBRs but also for the HCGs. HCGs may offer advantages such as transverse mode and polarization control, a broader reflectivity spectrum than epitaxially grown DBRs, and the possibility to set the resonance wavelength after epitaxial growth by the grating parameters. In this work we have realized an air-suspended TiO2 grating with the help of a SiO2 sacrificial layer. The deposition processes for the dielectric layers were fine-tuned to minimize the residual stress. To achieve an accurate control of the grating duty cycle, a newly developed lift-off process, using hydrogen silesquioxan (HSQ) and sacrificial polymethyl-methacrylate (PMMA) resists, was applied to deposit the hard mask, providing sub-10 nm resolution. The finally obtained TiO2/air HCGs were characterized in a micro-reflectance measurement setup. A peak power reflectivity in excess of 95% was achieved for TM polarization at the center wavelength of 435 nm, with a reflectivity stopband width of about 80 nm (FWHM). The measured HCG reflectance spectra were compared to corresponding simulations obtained from rigorous coupled-wave analysis and very good agreement was found.

dielectric materials

high-contrast grating

gallium nitride

TiO2

vertical-cavity surface-emitting laser

Författare

Seyed Ehsan Hashemi

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

Jörgen Bengtsson

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

Johan Gustavsson

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

STEFAN CARLSSON

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

Georg Rossbach

Ecole Polytechnique Federale de Lausanne (EPFL)

Åsa Haglund

Chalmers, Mikroteknologi och nanovetenskap, Fotonik

Proceedings of SPIE - The International Society for Optical Engineering

0277786X (ISSN) 1996756X (eISSN)

Vol. 9372 93720D
978-162841462-2 (ISBN)

High Contrast Metastructures IV
San Francisco, USA,

Ämneskategorier

Bearbetnings-, yt- och fogningsteknik

Nanoteknik

DOI

10.1117/12.2078951

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Senast uppdaterat

2021-02-19