Efficient photon detection from color centers in a diamond optical waveguide
| Autor: | Sage, D. Le, Pham, L. M., Bar-Gill, N., Belthangady, C., Lukin, M. D., Yacoby, A., Walsworth, R. L. |
|---|---|
| Rok vydání: | 2012 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.85.121202 |
| Popis: | A common limitation of experiments using color centers in diamond is the poor photon collection efficiency of microscope objectives due to refraction at the diamond interface. We present a simple and effective technique to detect a large fraction of photons emitted by color centers within a planar diamond sample by detecting light that is guided to the edges of the diamond via total internal reflection. We describe a prototype device using this "side-collection" technique, which provides a photon collection efficiency of approximately 47% and a photon detection efficiency of approximately 39%. We apply the enhanced signal-to-noise ratio gained from side-collection to AC magnetometry using ensembles of nitrogen-vacancy (NV) color centers, and demonstrate an AC magnetic field sensitivity of 100 pT/\sqrt{Hz}, limited by added noise in the prototype side-collection device. Technical optimization should allow significant further improvements in photon collection and detection efficiency as well as sub-picotesla NV-diamond magnetic field sensitivity using the side-collection technique. Comment: 4 pages, 3 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|