@misc{oai:repo.qst.go.jp:00082157,
 author = {Kamitsubo, Y. and Sekiguchi, T. and Yuta, Masuyama and Taniguchi, T. and MIyakawa, M. and Shinei, C. and Shinobu, Onoda and Seiichi, Saiki and Shuya, Ishii and Teraji, T. and Takeshi, Ohshima and Iwasaki, T. and Hatano, M. and Yuta, Masuyama and Shinobu, Onoda and Seiichi, Saiki and Shuya, Ishii and Takeshi, Ohshima},
 month = {Dec},
 note = {The nitrogen-vacancy (NV) center in diamond is extensively studied for a next-generation high-sensitivity magnetometer. The DC magnetic sensitivity can be improved by extending the inhomogeneous spin dephasing time through suppressing the effects of inhomogeneous fluctuations or by increasing the number of effective NV centers through expanding the sensor volume. It has been demonstrated that strain-induced dephasing can be suppressed by double quantum (DQ) technique with two-tone microwaves (MW), and spin bath-induced dephasing can be suppressed by spin bath drive (SBD) technique with multi-tone radio-frequency (RF) to drive the P1 centers. To combine these T2* -extension  techniques with a bulk diamond, it is necessary to apply MW and RF uniformly to the sample. A coplanar waveguide (CPW)  circuit has been reported to be useful for uniform microwave irradiation to a bulk sample. In this study, we reports the newly designed and fabricated a cross-aligned two-layer CPW circuit., 3rd IFQMS},
 title = {Crossed two-layer coplanar-waveguide circuit for extending spin dephasing time T2* of ensemble NV centers in a bulk diamond},
 year = {2020}
}