Metamaterials: Leading light waves astray
"The production of metamaterials for the manipulation of microwaves presents no special technological challenges -- but finding technically feasible ways of controlling the behavior of visible light in a similar fashion is a much more difficult task, because optical wavelengths are much shorter, on the order of half a micron," says Professor Heinz Langhals of the Department of Chemistry at LMU. The first attempts to overcome the technical hurdles depended on the use of elaborate nanotechnological methods that cannot easily be scaled up. However, Langhals and his colleague Alexander Hofer have now synthesized metamaterials based on organic molecules as building blocks. This approach has several advantages over the metallic nanostructures previously used, as the synthetic procedures are more efficient, the components are smaller and their structures can be varied at will. The special geometry required for their metafunction is created entirely by chemical means.
The wrong way around
"We utilize organic compounds with so-called conjugated double-bond systems, which allow the electrons to circulate freely within the molecule," Langhals explains. The necessary electromagnetic resonances arise from the presence in the compound of chromophores, which give the molecule a characteristic color. Chromophores resonantly absorb light in the visible portion of the spectrum. The crucial feature of the newly synthesized molecules is that they contain chromophore electron systems that are arranged in parallel, separated by spacers that permit length-dependent control of interactions between chromophores. This particular spatial configuration alters the refractive properties of the new materials, and in ways that give rise to novel effects. If the sign of the refractive index can be turned negative, light impinging on the material is bent in the opposite direction to light that interacts with a naturally occurring material or medium. "So metamaterials could guide rays of visible light around an object, effectively rendering it invisible," says Langhals.
Although this goal is still some way off, the new organic metamaterials provide the thread from which an invisibility cloak might one day be woven. The fabric itself can perhaps be put together with the help of suitable liquid-crystal structures. At all events, further work on the design of enhanced metamaterials is underway. "Such materials have a broad range of potential uses, and perhaps even more interesting than a simple cloaking function are applications in the area of light-based information technology -- the manufacture of ultrathin optical lenses, for instance. We can certainly expect some exciting developments in the future," Langhals concludes.
Welcome to SUV System Ltd!
SUV System Ltd is ISO 90012008 Certified electronics distributor with 10 years of experiences.
We have built up long term business relationship with about many companies which are stockers and authorized agents. we have a steady and reliable supply to meet customer's demands to the greatest extent .Confidently, we are able to lower your cost and support your business with our years of professional service.
SUV System Ltd is Electronic Components Distributor Supplies,Find Quality Electronic Components Supplies Products IC(Integrated Circuits),Connectors,Capacitor,Resistors,Diodes,Transistors,LED at Suvsystem.com. Sourcing Other Energy, Environment, Excess Inventory Products from Manufacturers and Suppliers at Suvsystem.com
Electronic Components distributor:http://www.suvsystem.com
Connectors Distributor:http://www.suvsystem.com/l/Connectors-1.html
IC Distributor:http://www.suvsystem.com/l/IC(Integrated-Circuits)-1.html
LED Distributor:http://www.suvsystem.com/l/LED-1.html
Capacitor Distributor:http://www.suvsystem.com/l/Capacitor-1.html
Transistor Distributor:http://www.suvsystem.com/l/Transistors-1.html
Resistor Distributor:http://www.suvsystem.com/l/Resistors-1.html
Diode Distributor:http://www.suvsystem.com/l/Diodes-1.html
SUV System Ltd insists on the managing faith ofsincereness,speciality,foresight, win-win,so we build up stable-relationship customers located all over the world, including the States, Europe, Argentina, UAE, Malaysia, Australia,and India etc
we are focus on the following fields,and hope we can help you.
CR0805-FX-28R7ELF CR0805-FX-28R7E CR0805-FX-28R0ELF CR0805-FX-28R0E CR0805-FX-2873ELF CR0805-FX-2873E CR0805-FX-2872ELF CR0805-FX-2872E CR0805-FX-2871ELF CR0805-FX-2871E CR0805-FX-2870ELF CR0805-FX-2870E CR0805-FX-2803ELF CR0805-FX-2803E CR0805-FX-2802ELF CR0805-FX-2802E CR0805-FX-2801ELF CR0805-FX-2801E CR0805-FX-2800ELF CR0805-FX-2800E CR0805-FX-27R4ELF CR0805-FX-27R0ELF CR0805-FX-27R0E CR0805-FX-2743ELF CR0805-FX-2743E CR0805-FX-2742ELF CR0805-FX-2742E CR0805-FX-2741ELF CR0805-FX-2741E CR0805-FX-2740ELF CR0805-FX-2740E CR0805-FX-2703ELF CR0805-FX-2703E CR0805-FX-2702GLF CR0805-FX-2702G CR0805-FX-2702ELF CR0805-FX-2702E CR0805-FX-2701ELF CR0805-FX-2701E CR0805-FX-2700GLF
http://www.suvsystem.com/a/2369.aspx
