118 citations · 427 across the 19 of their papers we have counts for
19 papers
Nitrogen Vacancy Centers in Diamond for Quantum Biosensing: Magnetometry Techniques, Platforms and Applications
Sirsendu Ghosal, Umakant Prajapati, Sachin Negi +3
Quantum sensing using nitrogen-vacancy (NV) centers in diamond has emerged as a powerful platform for detecting ultra-low magnetic fields under ambient conditions. Owing to their l…
A Hybrid Jump-Diffusion Model for Coherent Optical Control of Quantum Emitters in hBN
Saifian Farooq Bhat, Michael K. Koch, Sachin Negi +2
Hexagonal boron nitride (hBN) has emerged as a promising two-dimensional host for stable single-photon emission owing to its wide bandgap, high photostability, and compatibility wi…
Femtosecond laser-written nano-ablations containing bright antibunched emitters on gallium nitride
Yanzhao Guo, Giulio Coccia, Vibhav Bharadwaj +5
Femtosecond laser-writing offers distinct capabilities for fabrication, including three-dimensional, multi-material, and sub-diffraction-limited patterning. In particular, demonstr…
Optical and microstructural studies of femtosecond laser treated amorphous germanium thin coatings
L. Kotsedi, A. Abdelmalek, V. Bharadwaj +8
The study of the relaxation mechanism of amorphous germanium after femtosecond laser irradiation is presented in this work. In particular, a thin germanium coating was deposited on…
Vector Magnetometry Using Shallow Implanted NV Centers in Diamond with Waveguide-Assisted Dipole Excitation and Readout
Sajedeh Shahbazi, Giulio Coccia, Argyro N. Giakoumaki +8
On-chip magnetic field sensing with Nitrogen-Vacancy (NV) centers in diamond requires scalable integration of 3D waveguides into diamond substrates. Here, we develop a sensing arra…
Laser-written waveguide-integrated coherent spins in diamond
Yanzhao Guo, John P. Hadden, Federico Gorrini +12
Quantum emitters, such as the negatively charged nitrogen-vacancy center in diamond, are attractive for quantum technologies such as nano-sensing, quantum information processing, a…
Determining Strain Components in a Diamond Waveguide from Zero-Field ODMR Spectra of NV Center Ensembles
M. Sahnawaz Alam, Federico Gorrini, Michał Gawełczyk +13
The negatively charged nitrogen-vacancy (NV) center in diamond has shown great potential in nanoscale sensing and quantum information processing due to its rich spin physics.…
Limits for coherent optical control of quantum emitters in layered materials
Michael K. Koch, Vibhav Bharadwaj, Alexander Kubanek
The coherent control of a two-level system is among the most essential challenges in modern quantum optics. Understanding its fundamental limitations is crucial, also for the reali…
On-chip single-photon subtraction by individual silicon vacancy centers in a laser-written diamond waveguide
Michael K. Koch, Michael Hoese, Vibhav Bharadwaj +6
Modifying light fields at single-photon level is a key challenge for upcoming quantum technologies and can be realized in a scalable manner through integrated quantum photonics. La…
An integrated magnetometry platform with stackable waveguide-assisted detection channels for sensing arrays
Michael Hoese, Michael K. Koch, Vibhav Bharadwaj +8
The negatively-charged NV-center in diamond has shown great success in nanoscale, high-sensitivity magnetometry. Efficient fluorescence detection is crucial for improving the s…
Laser-Inscribed Diamond Waveguide Resonantly Coupled to Diamond Microsphere
Nurperi Yavuz, Mustafa Mert Bayer, Hüseyin Ozan Cirkinoğlu +6
An all-diamond photonic circuit was implemented by integrating a diamond microsphere with a femtosecond-laser-written bulk diamond waveguide. The near surface waveguide was fabrica…
Quantum micro-nano devices fabricated in diamond by femtosecond laser and ion irradiation
Shane M. Eaton, J. P. Hadden, Vibhav Bharadwaj +12
Diamond has attracted great interest as a quantum technology platform thanks to its optically active nitrogen vacancy center (NV). The NV's ground state spin can be read out optica…
Chromium Oxide Formation on Nanosecond and Femtosecond Laser Irradiated Thin Chromium Films
L. Kotsedi, V. Furlan, V. Bharadwaj +9
Thin coatings of Chromium oxide have been used for applications as absorbing material in solar cells, as protections for magnetic data recording devices and as shields in flexible…
Femtosecond laser written diamond waveguides - a step towards integrated photonics in the far infrared
Vibhav Bharadwaj, Yuchen Wang, Toney Teddy Fernandez +3
A first demonstration and complete characterization of mid-infrared waveguides in diamond are reported in detail. Waveguides were designed for 2.4 um and 8.6 um waveguiding, with t…
Femtosecond laser inscription of nonlinear photonic circuits in Gallium Lanthanum Sulphide glass
María Ramos Vázquez, Belén Sotillo, Stefano Rampini +6
We report on femtosecond laser writing of single mode optical waveguides in chalcogenide Gallium Lanthanum Sulphide (GLS) glass. A multiscan fabrication process was employed to cre…
Polarized micro-Raman studies of femtosecond laser written stress-induced optical waveguides in diamond
B. Sotillo, A. Chiappini, V. Bharadwaj +7
Understanding the physical mechanisms of the refractive index modulation induced by femtosecond laser writing is crucial for tailoring the properties of the resulting optical waveg…
Femtosecond laser inscription of Bragg grating waveguides in bulk diamond
V. Bharadwaj, A. Courvoisier, T. T. Fernandez +7
Femtosecond laser writing is applied to form Bragg grating waveguides in the diamond bulk. Type II waveguides are integrated with a single pulse point-by-point periodic laser modif…
Integrated waveguides and deterministically positioned nitrogen vacancy centers in diamond created by femtosecond laser writing
J. P. Hadden, V. Bharadwaj, B. Sotillo +11
Diamond's nitrogen vacancy (NV) center is an optically active defect with long spin coherence times, showing great potential for both efficient nanoscale magnetometry and quantum i…
Diamond photonics platform enabled by femtosecond laser writing
Belen Sotillo, Vibhav Bharadwaj, J. P. Hadden +14
We demonstrate the first buried optical waveguides in diamond using focused femtosecond laser pulses. The properties of nitrogen vacancy centers are preserved in the waveguides, ma…