Frequency converter implementing an optical analogue of the cosmological redshift
Artikel i vetenskaplig tidskrift, 2010

According to general relativity, the frequency of electromagnetic radiation is altered by the expansion of the universe. This effect-commonly referred to as the cosmological redshift-is of utmost importance for observations in cosmology. Here we show that this redshift can be reproduced on a much smaller scale using an optical analogue inside a dielectric metamaterial with time-dependent material parameters. To this aim, we apply the framework of transformation optics to the Robertson-Walker metric. We demonstrate theoretically how perfect redshifting or blueshifting of an electromagnetic wave can be achieved without the creation of sidebands with a device of finite length.

frequency conversion

transformation optics


gravitational redshift

gravitational analogue


time-dependent metamaterial


Vincent Ginis

Philippe Tassin

Chalmers, Teknisk fysik, Kondenserade materiens teori

Ben Craps

Irina Veretennicoff

Optics Express

1094-4087 (ISSN)

Vol. 18 5 5350-5355


Nanovetenskap och nanoteknik


Atom- och molekylfysik och optik

Annan elektroteknik och elektronik

Den kondenserade materiens fysik