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Spectral Hole-Burning and Related Spectroscopies: Science and Applications

Spectral Hole Burning and Fluorescence Line Narrowing of Si Center in CVD Diamond

A.A. Gorokhovsky, Alexey V. Turukhin, R. R. Alfano, William Phillips

Published Jan 1, 1994• 0 citations
Publisher

Abstract

In this presentation we report on several spectral features associated with Si impurity in diamond related to spectral hole-burning. Diamond, with its hardness and high temperature stability, is a potentially useful material for high temperature hole-burning storage. The first hole-burning in bulk diamonds [1] was observed from color centers in the spectra of N3 at 415 nm, H4 at 496 nm, N-V at 637 nm, and GR1 at 741 nm. Recently, hole-burning was observed for color centers N-V at 637 nm and 574 nm of electron irradiated chemical-vapor deposited (CVD) diamonds [2].

DOI
10.1364/shbs.1994.wd54

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In this presentation we report on several spectral features associated with Si impurity in diamond related to spectral hole-burning. Diamond, with its hardness and high temperature stability, is a potentially useful material for high temperature hole-burning storage. The first hole-burning in bulk diamonds [1] was observed from color centers in the spectra of N3 at 415 nm, H4 at 496 nm, N-V at 637 nm, and GR1 at 741 nm. Recently, hole-burning was observed for color centers N-V at 637 nm and 574 nm of electron irradiated chemical-vapor deposited (CVD) diamonds [2].
The persistent spectral hole burning effect has been observed for the nitrogen vacancy (NV) center and the 2.16 eV center in chemical-vapor deposited (CVD) diamond. This sideband is the first observation of spectral hole burning in CVD diamond. Holes are burned in the inhomogeneously broadened zero-phonon lines of both the centers by dye lasers. The holes were observed by photoluminescence excitation spectroscopy, with monitoring of the phonon-sideband emission, at temperatures up to 130 K for the NV center and up to 100 K for the 2.16 eV center.
Abstract We report on the systematic characterization of the optical properties of diamond color centers based on Pb impurities. An ensemble photoluminescence analysis of their spectral emission was performed at different excitation wavelengths in the 405–520 nm range and at different temperatures in the 4–300 K range. The series of observed spectral features consist of different emission lines associated with Pb-related defects. Finally, a room-temperature investigation of single-photon emitters under 490.5 nm laser excitation is reported, revealing different spectral signatures with respect to those already reported under 514 nm excitation. This work represents a substantial progress with respect to previous studies on Pb-related color centers, both in the attribution of an articulated series of spectral features and in the understanding of the formation process of this type of defect, thus clarifying the potential of this system for high-impact applications in quantum technologies.
Silicon-vacancy (SiV) color centers in diamond offer a promising system for quantum information applications owing to their intense narrowband emission and optically detectable spin states. Here, the fluorescent properties of ensembles and single SiV centers in diamonds obtained by high-pressure high-temperature synthesis from adamantane (below referred to as adamantane diamonds) are investigated at liquid-helium temperatures. Ensembles of SiV centers (~10 3 ) are studied in large diamond crystals (1–2 µm in size). Despite the large number of excited centers, the fine structure of the zero-phonon line, corresponding to four allowed optical transitions between the ground- and excited-state doublets of the SiV center, can be observed in the fluorescence spectra of these crystals. The width of individual lines is in the range of 60–80 GHz, which is explained by their inhomogeneous broadening. Single SiV centers are studied in diamond crystallites with sizes of about 200 nm. The width of the narrowest transition lines observed in the fluorescence spectra of single SiV centers under resonant excitation is almost three orders of magnitude smaller than linewidths in the spectra of SiV ensembles and is as small as 94 MHz; i.e., these lines are so narrow that their width is determined by the lifetime of the upper state of the transition. Therefore, adamantane nanodiamond features the narrowest emission line width of a single SiV center at cryogenic temperatures among other types of SiV-con-taining nanodiamonds of similar sizes obtained by the high-pressure high-temperature and chemical vapor deposition techniques.
Silicon-vacancy (SiV) centers in diamond are promising systems for quantum information applications due to their bright single-photon emission and optically accessible spin states. Furthermore, SiV centers in low-strain diamond are insensitive to perturbations of the dielectric environment; i.e., they show very weak spectral diffusion. This property renders ensembles of SiV centers interesting for sensing applications. We here report on photoluminescence excitation (PLE) spectroscopy on an SiV ensemble in a low strain, chemical vapor deposition-grown high-quality diamond layer, where we measure the fine structure with high resolution and obtain the line widths and splittings of the SiV centers. We investigate the temperature dependence of the width and position of the fine structure peaks. Our measurements reveal line widths of about 10 GHz as compared to a lifetime limited width on the order of 0.1 GHz. This difference arises from the inhomogeneous broadening of the transitions caused by residual strain. To overcome inhomogeneous broadening we use spectral hole burning spectroscopy, which enables us to measure a nearly lifetime limited homogeneous line width of 279 MHz. Furthermore, we demonstrate evidence of coherent interaction in the system by driving a $\mathrm{\ensuremath{\Lambda}}$ scheme. Additional measurements on single emitters created by ion implantation confirm the homogeneous line widths seen in the spectral hole burning experiments and relate the ground-state splitting to the decoherence rate.