Nanowerk April 25, 2024 Recent advancements have witnessed a significant shift toward the utilization of “flat” optics with thickness at subwavelength scales for the development of quantum light sources. This approach offers notable advantages over conventional bulky counterparts, including compactness, scalability, and improved efficiency, along with added functionalities. In this review researchers in Australia focused on the recent advances in leveraging flat optics to generate quantum light sources. Specifically, the generation of entangled photon pairs through spontaneous parametric down-conversion in nonlinear metasurfaces, and single photon emission from quantum emitters including quantum dots and color centers in 3D and 2D materials […]
Tag Archives: Sensing
High-speed, efficient, and compact electro-optic modulators for free space
Science Daily June 7, 2022 Modulators based on metasurface architectures that modulate free-space light at gigahertz (GHz) speeds can boost flat optics technology by microwave electronics for active optics, diffractive computing, or optoelectronic control. An international team of researchers (USA – Harvard University, University of Washington, Switzerland) has demonstrated a modulator that consists of a thin layer of an organic electro-optic material deposited on top of a metasurface etched with sub-wavelength resonators integrated with microwave electronics. When a microwave field is applied to the electro-optical material, its refractive index changes, changing the intensity of light that is being transmitted by […]
Scientists develop novel DNA logic circuits
Phys.org July 12, 2021 To construct a bipedal DNA walking nanomachine an international team of researchers (USA – University of New York, China) constructed a series of DNA logic circuits based on cascade strand displacement amplification. They modified track DNA probes with the stem-loop structure on the electrode interface. In the upstream homogeneous system, target-triggered strand displacement amplification was introduced to generate a large number of single-stranded sequences. The DNA three-way junction structure was then assembled as a bipedal moved around the electrode interface to enrich electrochemical signal molecules. Using incomplete three-way junction and double-stranded structures, logic gates AND and […]