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Физики остановили видимый свет

Группа исследователей из Нидерландов и США получила метаматериал, в котором фазовая скорость света близка к нулю, а коэффициент преломления становится отрицательным, пишет Lenta.ru.

Ученые утверждают, что их разработка стала первым трехмерным метаматериалом, который демонстрирует подобные свойства для видимого света.

Придать образцу необычные свойства физикам удалось за счет создания собой структуры, элементы которой были существенно меньше длины волны излучения. Для этого на поверхности экспериментальной пластинки из нитрида кремния ученые нанесли серию параллельных дорожек из серебра. Их получали методом парофазного осаждения.

Создание упорядоченной структуры привело к появлению эффекта, теоретически предсказанного еще в 1967 году Виктором Веселаго. Фазовая скорость света, то есть скорость, с которой движутся горбы и впадины световой волны (но не та скорость, с которой происходит перенос энергии), в материале упала почти до нуля. За 400 нанометров, которые свет проходил в образце, его фаза сдвигалась всего на 90 градусов, то есть на четверть длины волны. Измерения показали падение диэлектрической проницаемости до нуля и ниже, причем материал оказался достаточно прозрачным и работал в видимом свете с длинами волн до 400 нанометров.

Метаматериалы с отрицательным коэффициентом преломления позволяют реализовать ряд недостижимых в обычной оптике эффектов. Авторы новой разработки считают, что она позволит повысить эффективность светодиодов, а также поможет в создании устройств, которые изменяют заданным образом волновой фронт светового сигнала: это, в свою очередь, необходимо в оптоэлектронных системах.

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    Seven wonders of Kiev
    Kiev is the heart of Ukraine. There are a lot of ancient houses, priceless monuments of culture, famous churches, beautiful parks and squares, wonderful places worth visiting. Quite recently Ukrainians and guests of the city chose seven most amazing places in Kyiv and named them miracles. We offer to immerse in an old atmosphere of Kiev, see the main attractions and beauties in our best tour "Seven Wonders of Kiev"


    Meet in Hotel
    Our guide will come to your hotel (lobby area) or any other indicated address. You will see: St. Vladimir Cathedral, the Golden Gate, St. Sophia Cathedral, St. Andrew's Church, Vydubitsky Saint Michael Monastery, Kiev-Pechersk Lavra Monastery and House with Chimaeras.

    We suggest start our trip with the most visited tourist attraction of the capital. St. Vladimir Cathedral is the main temple of the Ukrainian Orthodox Church, one of the most beautiful monuments of neo-Byzantine architecture, not only in the capital, but through out Ukraine

    Andreevsky Descent is the oldest street in Kiev. The street was named in honor of St. Andrew's Church, which was established at the beginning of the descent in the middle ofthe VIII century. There is a legend, earlier on the place of the Dnieper was the sea, when the apostle Andrew came and installed a cross on a hill, the sea obeyed, and the water left


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    Mezhyhirya - is a former residence of Viktor Yanukovich in the village Novye Petrovtsy, Kiev region. The history of this place is extremely interesting. By sources, history begins In the X century, when the Greek monks led by the first Kyiv Metropolitan, were founded a monastery on this pictures queslopes. A lot has happened to this famous landmark over the time of its history and you will see what remains . The place has not lost its charming natural beauty. During the time of Yanukovych's presidency, this place was called a symbol of corruption of a presidential scale and a museum of corruption. Now this place has been returned to the people and primarily is an amazing place of beauty ! A large-scale natural complex, clean air, interesting infrastructure and entertainment for every taste, fountains and ponds, animals and birds, this place is definitely worth seeing and will leave warm memories in your heart even with its previous history.|


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