Lifetime Reduction and Enhanced Emission of Single Photon Color Centers in Nanodiamond via Surrounding Refractive Index Modification.,Scientific Reports

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Lifetime Reduction and Enhanced Emission of Single Photon Color Centers in Nanodiamond via Surrounding Refractive Index Modification.
Scientific Reports ( IF 3.8 ) Pub Date : 2015-Jun-25 , DOI: 10.1038/srep11179
Asma Khalid ₁ , Kelvin Chung ₁ , Ranjith Rajasekharan ₂ , Desmond W M Lau ₁ , Timothy J Karle ₁ , Brant C Gibson ₁ , Snjezana Tomljenovic-Hanic ₁

Affiliation

The negatively-charged nitrogen vacancy (NV(-)) center in diamond is of great interest for quantum information processing and quantum key distribution applications due to its highly desirable long coherence times at room temperature. One of the challenges for their use in these applications involves the requirement to further optimize the lifetime and emission properties of the centers. Our results demonstrate the reduction of the lifetime of NV(-) centers, and hence an increase in the emission rate, achieved by modifying the refractive index of the environment surrounding the nanodiamond (ND). By coating the NDs in a polymer film, experimental results and numerical calculations show an average of 63% reduction in the lifetime and an average enhancement in the emission rate by a factor of 1.6. This strategy is also applicable for emitters other than diamond color centers where the particle refractive index is greater than the refractive index of the surrounding media.

中文翻译：

通过周围折射率修改，减少纳米金刚石中单光子色心的寿命并增强其发射。

金刚石中带负电的氮空位（NV（-））中心由于其在室温下具有非常理想的长相干时间，因此对量子信息处理和量子密钥分配应用非常感兴趣。它们在这些应用中使用的挑战之一涉及需要进一步优化中心的寿命和发射特性。我们的结果表明，通过改变纳米金刚石 (ND) 周围环境的折射率，可以缩短 NV(-) 中心的寿命，从而提高发射率。通过在聚合物薄膜上涂覆 ND，实验结果和数值计算表明，寿命平均缩短 63%，发射率平均提高 1.6 倍。该策略也适用于钻石色心以外的发射器，其中颗粒折射率大于周围介质的折射率。

更新日期：2015-06-26

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