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Diamond Photonic Crystal Slab with Enhanced Photoluminescence Extraction Efficiency

  • Lukas Ondič
  • I. Pelant
Conference paper
Part of the NATO Science for Peace and Security Series B: Physics and Biophysics book series (NAPSB)

Abstract

Diamond-based materials exhibit many unique properties, one of them being a broad-band visible photoluminescence (PL) due to a variety of color centers. However, the PL extraction from the diamond layer is inefficient due to high material refractive index. One possibility of increasing the extraction efficiency is by employing a shallow two-dimensional photonic crystal (2D-PhC) at the top of the layer. Then light generated inside the layer and coupled to guided modes can interact with the periodic index modulation and can be Bragg scattered into surrounding air in case that the phase matching condition is fulfilled [1].

Here we report on enhanced extraction efficiency of intrinsic PL from a nanocrystalline diamond (NCD) layer achieved by introducing the 2D-PhC consisting of NCD columns ordered into the square lattice. A 420 nm thick NCD layer was grown on silica substrate by microwave plasma assisted CVD process [2]. Its surface was then patterned employing electron beam lithography into the form of 2D-PhC, the dimensions of which were chosen carefully such that they allow effective light extraction within the whole visible region.

Spectrally resolved micro-PL measurements, detected within a broad angle from the top of the structure, revealed up to 6-fold enhancement of PL from the PhC compared to the uncorrugated layer [3]. Angle and spectrally resolved measurements of PL and optical transmittance allow us to map the photonic band diagram of our sample [4]. The results show good agreement with the computed photonic band diagram suggesting that mainly the PhC effect contributes to the PL enhancement. To the best of our knowledge, this is the first observation of an effect of this kind in NCD and is promising for taking advantage of the diamond PL in optical, optoelectronic, and biological applications.

Keywords

Extraction Efficiency Electron Beam Lithography Light Extraction Nanocrystalline Diamond Diamond Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Boroditsky M et al (1999) Light extraction from optically pumped light-emitting diode by thin-slab photonic crystals. Appl Phys Lett 75:1036–1038ADSCrossRefGoogle Scholar
  2. 2.
    Kromka A et al (2008) Formation of continuous nanocrystalline diamond layers on glass and silicon at low temperatures. Chem Vap Depos 14:181–186CrossRefGoogle Scholar
  3. 3.
    Ondič L et al (2011) Effective extraction of photoluminescence from a diamond layer with a photonic crystal. ACS Nano 5:346–350CrossRefGoogle Scholar
  4. 4.
    Ondič L et al (2011) Enhanced photoluminescence extraction efficiency from a diamond photonic crystal via leaky modes. New J Phys 13:063005CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Institute of PhysicsAcademy of Sciences of the Czech RepublicPrague 6Czech Republic
  2. 2.Faculty of Mathematics and PhysicsCharles UniversityPrague 2Czech Republic

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