- Photonic and Optical Devices
- Quantum optics and atomic interactions
- Photorefractive and Nonlinear Optics
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Terahertz technology and applications
- Quantum Information and Cryptography
- Random lasers and scattering media
- Quantum Mechanics and Applications
- Radiation Shielding Materials Analysis
- Ferroelectric and Piezoelectric Materials
- Nonlinear Dynamics and Pattern Formation
- Advanced X-ray and CT Imaging
- Geophysics and Sensor Technology
- X-ray Spectroscopy and Fluorescence Analysis
- Education Systems and Policy
- Orbital Angular Momentum in Optics
- Neural Networks and Reservoir Computing
- Early Childhood Education and Development
- Magneto-Optical Properties and Applications
Purdue University West Lafayette
2015-2022
Indiana University – Purdue University Indianapolis
2020
Indian Institute of Science Education and Research Kolkata
2014-2016
North Bengal University
1990
The optical analogue of quantum weak measurements has shown considerable promise for the amplification and observation tiny beam shifts, namely Goos–Hänchen (GH) Imbert–Fedorov (IF) shifts. Here, we demonstrate simultaneous value both angular GH IF shifts in partial reflection a fundamental Gaussian at planar dielectric interfaces. We employ pre postselection schemes with appropriate linear polarization basis states these experimentally observed enhancement their dependence on angle...
The spatial and the angular variants of Imbert-Federov (IF) beam shifts Goos-Hänchen (GH) shift contribute in a complex interrelated way to resultant partial reflection at planar dielectric interfaces. Here, we show that two IF effects can be decoupled separately observed by weak value amplification subsequent conversion ↔angular nature using appropriate pre post selection polarization states. Such optimized measurement schemes also enable one nullify effect (either GH or IF) exclusively...
We investigated the optical properties of rare-earth ions (Yb3+ and Er3+) implanted into lithium niobate (LN) crystals observed superluminescent emission from a sheet Yb in Yb-implanted LN crystal (Yb:LN). Moreover, by directly integrating Er-implanted (Er:LN) with silicon photonic chip waveguide resonator structures, we evanescent coupling photoluminescent light Er to modes microcavity. measured an quality factor about 104 modification Er3+ integrated structure. The platform can ultimately...
We introduce our design, simulation, and fabrication for cm-long waveguides micro-ring resonators based on fully-etched thin-film lithium niobate insulator (LNOI) incorporated with rare earth ions. implant ytterbium ions (Yb3+) into the crystalline host study their optical properties at 4 K temperature. measure an intrinsic quality factor of higher than 2×106 after postimplantation annealing. characterize photoluminescence spectrum, lifetime, absorption Yb3+ Incorporation LNOI as a nonlinear...
Abstract Engineering arrays of active optical centers to control the interaction Hamiltonian between light and matter has been subject intense research recently. Collective atomic with photons can give rise directionally enhanced absorption or emission, which enables engineering broadband strong atom-photon interfaces. Here, we report on observation long-range cooperative resonances in an array rare-earth ions controllably implanted into a solid-state lithium niobate micro-ring resonator. We...
We report the result of our study on dependency photon generation and storage to atomic geometry in an optical resonator. show that atoms ensemble can be engineered control collective excitations a way achieve high degree correlation between photons. Moreover, we discuss role such structures efficiently store photons among small number regions.
By engineering atomic geometries composed of nearly 1000 segments embedded in micro-resonators, we observe Bragg resonances induced by the lattice at telecommunication wavelength. The geometrical arrangement erbium atoms into a inside silicon nitride (SiN) microring resonator reduces scattering loss wavelength commensurate with lattice. We confirm dependency light emission to positions and spacing also Fano interference between resonant modes system.
Results for the atomic elastic scattering of photons 59.54 keV lying in vicinity K-absorption edges rare earths ${(}_{68}$Er and $_{70}\mathrm{Yb}$) are presented. An assessment all existing experimental results published last few years has been made terms some most important calculations on photon--bound-electron collisions as a function photon energy momentum transfer that have developed 1980s. The analysis presents trend behavior theoretical cross section incident crosses K-shell...
Spatial distribution of atoms plays an important role in the interaction atomic ensembles and electromagnetic fields. In this Letter, we show that by spatio-spectral tailoring absorption, one can effectively carve out a periodic array from randomly distributed hosted solid-state crystal. Furthermore, observe collective resonances coherent backscattering light rare-earth-doped crystals. Coherent as high 20% was observed for at telecom wavelength Er ions, forming effective with over 5000 centers.
The spatial and the angular variants of Goos-H\"anchen (GH) Imbert-Federov (IF) beam shifts contribute in a complex interrelated way to resultant shift partial reflection at planar dielectric interfaces. Here, we show that GH two IF effects can be decoupled, amplified separately observed by weak value amplification subsequent conversion spatial$\leftrightarrow$angular nature using appropriate pre post selection polarization states. We experimentally demonstrate such decoupling illustrate...
Typical nano-mechanical oscillator arrays exhibit a mechanical frequency distribution arising from the imprecision in nanofabrication process, thus hindering their collective dynamics. We tailor inhomogeneously broadened spectrum of nano-oscillator ensemble to unravel dynamics oscillators an optomechanical array. show that by engineering tunable interactions, instantaneous phase matching between reveals form photon-phonon echo excitation without need for active tuning. Using numerical...
Using ion implantation, on-chip photonic fabrication and heterogeneous integration, we demonstrate a solid-state interface between rare earth ions telecomm photons in various designs. The platforms enable study of collective coherent light-atom interactions on chip.
We investigate the fabrication of lithium niobate micro-ring resonators on insulator and characterize optical properties ytterbium ions implanted in LN thin-film. The photoluminescence lifetime linewidth change cavity around 918nm absorption peak were measured at 4K.
The electromagnetic field from an ordered array of emitters can interfere giving rise to effective emitter-emitter interactions. We study the interaction light with thulium ions in microring lithium niobate resonators. show that rare-earth arranged into collectively emit micro-resonator. achieve this via deterministic implantation nanofabricated on insulator micro-ring at cryogenic temperatures, both Purcell enhancement and cooperative emission be observed these structures.
Using an ion implantation technique, we demonstrate that precisely implanted arrays of thulium ions can be engineered to study collective and coherent light-atom interactions on solid-state lithium niobate ring resonators.
We observed collective atomic resonances and coherent backscattering of light from rare-earth doped crystals by spatio-spectral tailoring absorption. The observation enables creation efficient solid-state subradiant quantum memories superradiant photon sources.
We investigate the optical properties of an array thulium ions implanted into a lithium niobate ring resonator. present data showing that ions' emission rate increases at 4K due to both cavity-induced Purcell enhancement and also array-induced cooperative coupling.