Optical Analysis of p‐Type Surface Conductivity in Diamond with Slotted Photonic Crystals

2D slotted diamond‐based photonic crystals (PhCs) with Q factors up to 6500 are fabricated and optically characterized at 1550 nm in order to probe surface molecular modifications. This study focuses on the simplest surface modifications that can modify the diamond PhC optical properties, namely, hy...

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Bibliographic Details
Published in:Advanced optical materials 2013-12, Vol.1 (12), p.963-970
Main Authors: Blin, Candice, Checoury, Xavier, Girard, Hugues A., Gesset, Céline, Saada, Samuel, Boucaud, Philippe, Bergonzo, Philippe
Format: Article
Language:English
Subjects:
Diamonds
Engineering Sciences
Estimates
Materials
Micro and nanotechnologies
Microelectronics
nanocavities
nanocrystalline diamond
Optics
Photonic
Photonic crystals
Q factors
Refractive index
Refractivity
Spectra
surface conductive layers
Three dimensional
transfer doping
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Summary:2D slotted diamond‐based photonic crystals (PhCs) with Q factors up to 6500 are fabricated and optically characterized at 1550 nm in order to probe surface molecular modifications. This study focuses on the simplest surface modifications that can modify the diamond PhC optical properties, namely, hydrogenation and oxidation. Depending on the chemical surface termination, these diamond PhCs exhibit a strong modification of their spectral features. When the surface is tuned from oxidized to hydrogenated, a resonance wavelength shift of the cavity occurs and is accompanied by a decrease of the Q factor. Moreover, experimental evidence is given that this phenomenon is reversible, as the initial value of the Q factor is recovered when the surface is re‐oxidized. This is attributed to the subsurface conductive layer that is due to transfer doping in hydrogenated diamond and which is absent from oxidized diamond. Thanks to 3D finite differences in time domain (FDTD) simulations, an estimate of the effective refractive index of the surface conductive layer at 1.5 μm is given as a function of its thickness. This result highlights the high sensitivity of slotted diamond PhC and the importance of surface control for biosensing with diamond. Chemically induced surface conductivity is optically evidenced on nanocrystalline diamond‐based slotted photonic crystals (PhCs). By simply tuning the surface termination of diamond‐PhCs, a strong modification of the spectral features demonstrates the high sensitivity to the p‐type subsurface conductivity existing in hydrogenated diamond. This leads to a first estimate of the refractive index of this conductive layer as a function of its thickness.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.201300331