More Like this

1. Emerging applications of wavelength conversion

   https://doi.org/10.1109/IPC48725.2021.9592892  

   Shamsshooli, Afshin; Guo, Cheng; Vasilyev, Michael; Parmigiani, Francesca; Li, Xiaoying; Akasaka, Youichi; Palacharla, Paparao (October 2021, 2021 IEEE Photonics Conference (IPC))

   We discuss three emerging applications of wavelength conversion: 1) hybrid amplification outside of EDFA band, based on a combination of two wavelength converters and an EDFA, 2) spatial-mode-selective wavelength conversion, and 3) generation of spatial-mode-entangled photon pairs. 

   more » « less
2. Wavelength-multiplexed single-shot ptychography

   https://doi.org/10.1016/j.ultramic.2021.113418  

   Barolak, Jonathan; Goldberger, David; Squier, Jeff; Bellouard, Yves; Durfee, Charles; Adams, Daniel (March 2022, Ultramicroscopy)
3. Swept-Angle Synthetic Wavelength Interferometry

   https://doi.org/10.1109/CVPR52729.2023.00796  

   Kotwal, Alankar; Levin, Anat; Gkioulekas, Ioannis (June 2023, IEEE)
4. Wavelength-scale optical parametric oscillators

   https://doi.org/10.1364/OPTICA.411708  

   Jahani, Saman; Roy, Arkadev; Marandi, Alireza (February 2021, Optica)

   Despite recent progress in nonlinear optics in wavelength-scale resonators, there are still open questions on the possibility of parametric oscillation in such resonators. We present a general approach to predict the behavior and estimate the oscillation threshold of multi-mode subwavelength and wavelength-scale optical parametric oscillators (OPOs). As an example, we propose an OPO based on Mie-type multipolar resonances, and we demonstrate that due to the low- $Q$nature of multipolar modes in wavelength-scale resonators, there is a nonlinear interaction between these modes. As a result, the OPO threshold, compared to the single-mode case, can be reduced by a factor that is significantly larger than the number of interacting modes. The multi-mode interaction can also lead to a phase transition manifested through a sudden change in the parametric gain as well as the oscillation threshold, which can be utilized for enhanced sensing. We establish an explicit connection between the second-harmonic generation efficiency and the OPO threshold. This allows us to estimate the OPO threshold based on measured or simulated second-harmonic generation in different classes of resonators, such as bound states in the continuum and inversely designed resonators. Our approach for analyzing and modeling miniaturized OPOs can open unprecedented opportunities for classical and quantum nonlinear photonics. 

   more » « less
5. Linear isolators using wavelength conversion

   https://doi.org/10.1364/OPTICA.385639  

   Abdelsalam, Kamal; Li, Tengfei; Khurgin, Jacob_B; Fathpour, Sasan (March 2020, Optica)

   Optical isolators, reliably integrated on-chip, are crucial components for a wide range of optical systems and applications. We introduce a new class of wideband nonmagnetic and linear optical isolators based on nonlinear frequency conversion and spectral filtering among the pump, signal, and idler wavelengths. The scheme is experimentally demonstrated using difference-frequency generation in periodically poled thin-film lithium niobate integrated devices and short- and long-pass optical filters. We demonstrate a wide bandwidth of more than 150 nm, limited only by the measurement setup, and an optical isolation ratio of up to 18 dB for the involved idler and signal waves. The difference of transmittance at the signal wavelength between forward and backward propagation is 40 dB. We also discuss pathways for substantial isolation improvement using appropriate anti-reflection coatings. The integrable isolator, operating in the telecommunication band, is characterized by a perfectly linear output versus input power dependence and can be incorporated into high-speed telecom and datacom systems as well as a variety of other applications. 

   more » « less