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The invention discloses a slow wave structure based on a semiconductor-filled metal waveguide structure. The slow wave structure comprises a uniform metal hollow waveguide pipe wall, an air gap and a conical filled high-refractive index semiconductor medium strip. In the slow wave structure, by utilizing the abnormal characteristic that the direction of energy flow in the air gap is opposite to that of energy flow in media when electromagnetic waves are transmitted in a high-refractive index semiconductor-filled waveguide structure and selecting parameters of the waveguide structure reasonably, the average energy flow of the electromagnetic waves with different frequencies in air and the average energy flow of the electromagnetic waves with different frequencies in a semiconductor at the corresponding position of waveguide are approximate, so the electromagnetic waves have extremely low group velocity. When the electromagnetic waves enter a port and are transmitted along the waveguide, the group velocity of the electromagnetic waves is reduced gradually, and the energy of the electromagnetic waves is enhanced gradually until the electromagnetic waves reach specific parts corresponding to the frequencies; and waveguide parts in which the electromagnetic waves with the different frequencies can reach are different from one another, so the frequency division, field restriction and reinforcing effects of the electromagnetic waves are realized simultaneously by the structure.

The invention relates to an LED street lamp, which comprises a lamp shell, a heat radiator arranged on one end face of the lamp shell, a lampshade arranged on the other end face of the lamp shell, and a driver arranged in the lamp shell, wherein heat transfer devices are arranged in lamp shell cavities which are positioned on the heat radiator and are coaxial with the lampshade respectively, the bottom of the heat transfer device is connected with a high-brightness light source, and a reflecting shade of which the covering surface corresponds to a transparent surface of the lampshade is clamped between the bottom of the heat transfer device and the high-brightness light source. The heat transfer device consists of a sealed cavity formed by a conical shell and the heat radiator, and a heatconducting fusing agent filled in the sealed cavity. The LED street lamp uses vaporization heat transfer and liquefaction heat exchange to heat the heat transfer liquid by the heat generated in the working process of an LED module through the heat transfer shell, and when the temperature reaches the boiling point of the heat transfer liquid, the liquid is boiled and vaporized, the gas can quicklytransfer the heat to the heat radiator, and the heat radiator liquefies the gas into liquid which falls back to the heat transfer shell for transferring heat continuously after the heat exchange between the heat radiator and the heat transfer gas.