АНАЛИЗ ОБРАЗОВАНИЯ ПЕРИОДИЧЕСКИХ НАНОСТРУКТУР НА ПОВЕРХНОСТИ ЗОЛОТА ПРИ ВОЗДЕЙСТВИИ ЛАЗЕРНЫХ УЛЬТРАКОРОТКИХ ИМПУЛЬСОВ ВБЛИЗИ ПОРОГА ПЛАВЛЕНИЯ

Предмет исследования. Механизм структуризации поверхности сверхкороткими лазерными импульсами включает много взаимосвязанных быстрых неравновесных процессов в твердом теле. Анализ экспериментальных данных не может охватить все механизмы наноструктурирования. В работе проведено прямое сравнение данных моделирования и экспериментальных результатов по наномодификации поверхности одним лазерным импульсом пикосекундной длительности. Метод. Экспериментальные результаты получены при воздействии лазерного излучения с длиной волны 248 нм и длительностью импульса 1,6 пс. Проекция маски (дифракционной решетки) на поверхность золота создает распределения интенсивности синусоидальной формой с периодом 500 нм. Образовавшиеся структуры проанализированы на сканирующем и просвечивающем электронных микроскопах. Для моделирования воздействия лазерного импульса на толстую золотую мишень применена гибридная модель, сочетающая молекулярную динамику и анализ на основе непрерывной (континуальной) двухтемпературной модели, способная проанализировать механизмы, ответственные за процесс наноструктурирования. Основные результаты. Показано хорошее совпадение результатов моделирования и экспериментальных данных, подтверждающее, что предлагаемый подход может стать мощным инструментом выявления физических процессов наноструктурирования поверхности металлов, который обеспечит микроскопическое представление о динамике процессов их структурирования. Представленная модель является важным шагом на пути к новым вычислительным инструментам в прогнозировании реакции материалов на воздействие ультракороткого лазерного импульса в атомном масштабе и свойств модифицированных поверхностей. Практическая значимость. Детальное понимание динамики процесса даст возможность разрабатывать топологии функциональных поверхностей на нано- и микромасштабах. 

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