SPIE, the international society for optics and photonics’ Post

Researchers from UC San Diego have developed an innovative approach to #multispectral #photodetection by alternating layers of #graphene and #colloidal #QuantumDots. By carefully engineering the material stack, the researchers created #photodetectors sensitive to different wavelength bands without additional #optical components. The key innovation lies in using graphene monolayers as independent charge collectors at different depths within a quantum dot absorber layer. https://lnkd.in/eu3zxKkE (Work funded by the National Science Foundation (NSF) and the United States Department of Defense)

Researchers from Helmholtz-Zentrum Dresden-Rossendorf and the University of Salerno have uncovered a non-linear Hall effect in thin films of elemental bismuth. This quantum phenomenon, observed at room temperature, opens doors for controlled terahertz high-frequency signals on electronic chips. The thin films, applicable even on plastic substrates, hold promise for modern high-frequency technology. Potential applications include converting terahertz electromagnetic waves into direct current, paving the way for significantly higher data transmission rates in future wireless communication systems. #QuantumBreakthrough #HighFrequencyTech #TerahertzElectronics

👏Welcome to read 📚The Feature Paper "Key Technologies in Developing Chip-Scale Hot Atomic Devices for Precision Quantum Metrology" 🧑🔬Huiyao Yu, et al. 👉Available at: https://lnkd.in/g9EuAhRc #Micromachines #MEMS cells #hot atomic devices

For a while I've felt that optical interconnects are set to replace traditional electrical methods. This would seem obvious to anybody with any grasp of current physics and technology. However what's interesting are the current challenges that the industry faces toward achieving this end-game. I read a couple of very interesting treatises on this that I think the community should take a gander at. Article 1: https://lnkd.in/ePnTnUJd Article 2: https://lnkd.in/epbWSyct

Reconfigurable free-space metasurfaces with subwavelength-scale tunable nano-scatterers can manipulate light for many applications ranging from bio-medical imaging, light detection and ranging to optical computing. In a recent paper published in IEEE Journal of Selected Topics in Quantum Electronics, we experimentally demonstrate an electrically tunable notch filter at a wavelength of ∼1150 nm on a Sb2S3-cladded silicon-on-sapphire platform. The notch filter is enabled by a 2-dimensional symmetry-protected quasi-bound-state-in-the-continuum (quasi-BIC) metasurface. We experimentally observed a quality factor of up to ∼200 and demonstrated reversible tuning of a record large volume (4.5 μm3) of Sb2S3. Thanks to the large modulation provided by Sb2S3, we observed a resonance shift as high as ∼4 nm in situ using a doped silicon microheater. Our work paves the way for compact and low-power nonvolatile notch filters. Moreover, due to the low loss of Sb2S3 in the visible, this work also lays the foundation for phase-only modulation in the visible using PCMs.

This paper considers a #stacked #intelligent #metasurface (#SIM) with the ability to perform beamforming in the #electromagnetic (#EM) wave domain. The authors develop a path-loss model that allows us to compute the received power of the signal after passing through the SIM. Based on the proposed path-loss model, they formulate an optimization problem to maximize the power at a desired target location in space. They develop a gradient ascent algorithm that can be applied when the phases of the meta-atoms of the SIM can be continuously varied. Also, they develop an #alternating #optimization (#AO) algorithm for the same problem when the meta-atoms can only apply discrete phase shifts. ---- Jiancheng An, Merouane Debbah More details can be found at this link: https://lnkd.in/gUmSJu7k

June 20 In-person Seminar: Quantum Dots for MicroLEDs https://lnkd.in/gE5Xcv6v MicroLEDs promise to play a major role in future display products: they are tiny, bright, power efficient, and long-lasting. However, transferring huge numbers of Red, Green, and Blue devices from the wafer to the display surface adds complexity and cost. MicroLED products can be more easily manufactured by using a single type of LED that can emit R, G, or B. One approach is to use only blue LED’s, then pattern a Color Conversion Layer so that B can also produce R or G. NanoPattern Technologies, Inc. makes Quantum Dot CCL’s without requiring vacuum. This greatly simplifies the deposition and patterning processes. Please join us on June 20 at Eurofins | EAG Laboratories in Sunnyvale with NanoPattern’s CTO, Danielle R. Chamberlin. #quantumdot #microled 

Again on the border of technology. Neuro morphic chip, quantum effects, quantum tunneling transistors and more. And we #IBM are here as always. Imagine a chip with a human brain architecture and with a power consumption less or equal to our brain. Lieutenant Data is here, the so-called Asimov's positrons brain is here. https://lnkd.in/duWKSSEj

In his recent Electronic Specifier article, Dr.Philip Krantz, Quantum Engineering Solutions, discusses ongoing trends that he sees when it comes to building up quantum ecosystems. Quantum technology allows us to harness the fundamental laws of quantum mechanics to solve problems that are either intractable or even impossible using today’s technology. #quantum #futureoftechnology https://lnkd.in/esrzd-Hb?

In his recent Electronic Specifier article, Dr.Philip Krantz, Quantum Engineering Solutions, discusses ongoing trends that he sees when it comes to building up quantum ecosystems. Quantum technology allows us to harness the fundamental laws of quantum mechanics to solve problems that are either intractable or even impossible using today’s technology. #quantum #futureoftechnology https://lnkd.in/gNhQq3dD?