Field-programmable silicon temporal cloak

Abstract

Temporal cloaks have aroused tremendous research interest in both optical physics and optical communications, unfolding a distinct approach to conceal temporal events from an interrogating optical field. The state-of-the-art temporal cloaks exhibit picosecond-scale and static cloaking window, owing to significantly limited periodicity and aperture of time lens. Here we demonstrate a field-programmable silicon temporal cloak for hiding nanosecond-level events, enabled by an integrated silicon microring and a broadband optical frequency comb. With dynamic control of the driving electrical signals on the microring, our cloaking windows could be stretched and switched in real time from 0.449 ns to 3.365 ns. Such a field-programmable temporal cloak may exhibit practically meaningful potentials in secure communication, data compression, and information protection in dynamically varying events.

Structural engineering of 3D hierarchical Cd0.8Zn0.2S for selective photocatalytic CO2 reduction

“…In the CO2-TPD measurements (Fig. 4(a)), two typical adsorption peaks were found at 220 and 370 °C, corresponding to the weak and strong alkaline adsorption centers on the surface of C8Z2S-F, respectively [38,39]. In the second alkaline adsorption center, either the desorption temperature or desorption strength of C8Z2S-F was significantly higher than that of C8Z2S-NP (located at 320 °C).…”

Platinum‐ and CuOx‐Decorated TiO2 Photocatalyst for Oxidative Coupling of Methane to C2 Hydrocarbons in a Flow Reactor

“…Thus, harsh reaction conditions, overoxidation, and the deposition of coke could be theoretically avoided. In the past two decades, a wide range of products have been successfully obtained through photocatalytic methane conversion, such as methanol, ethanol, ethane/ethylene, benzene, and syngas, in batch reactors, but with very moderate efficiency due to the following major causes. First, the high recombination rate of photoinduced carriers in the intrinsic semiconductor greatly limits their quantum efficiency, thus resulting in low conversion.…”

Recent Advances in Heterogeneous Photo‐Driven Oxidation of Organic Molecules by Reactive Oxygen Species

“…The in situ production of H 2 O 2 coupled with the oxidation of methane does not require any additional H 2 O 2 , which improves the atomic economy of the reaction. Zhou et al . proposed a methane‐methanol‐ethanol pathway using a copper modified polymeric carbon nitride (Cu/PCN) photocatalyst, which can obtain H 2 O 2 through H 2 O oxidation.…”