US Government As Represented by the Secretary of the Army

Domenico De Ceglia

Michael Scalora

Maria Antonietta Vincenti

Mirko Giuseppe Cappeddu

Giusseppe V Bianco

Pio Capezzuto

Marco Grande

Antonella D'Orazio

Giovanni Bruno

An optically transparent graphene-based wire-grid polarizer for operating at microwave frequencies (X band) has a glass substrate having multiple strips or layers of SOCldoped graphene. The strips are separated by portions of the glass substrate such that the strips are arranged in parallel. The SOCldoped graphene strips have a quasi-metallic quality allowing for the transmission of an electric field with horizontal polarization in the horizontal direction while reflecting the vertical portion of the electric field.

Optically transparent microwave polarizer based on quasi-metallic graphene

A photonic bandgap structure having multiple stacked layers has a thickness from the top of its top layer to the bottom of its bottom layer of less than one micron. Metal conducting layers having negative real dielectric constants are positioned between semiconductor layers having positive dielectric constants. The layers are arranged and stacked, and the thicknesses and materials for the semiconductor layers and conductive layers are selected to realize desired absorption, transmission, and reflection characteristics.

Photonic bandgap structure

A photovoltaic cell having multiple stacked layers has a thickness from the top of its top layer to the bottom of its bottom layer of less than one micron. Metal conducting layers are positioned between semiconductor layers with semiconductor layers having higher bandgaps being located above semiconductor layers having lower band gaps. The layers of the photovoltaic cell are arranged and stacked, and the thicknesses and materials for the semiconductor layers and conductive layers are selected to realize desired absorption, transmission, and reflection characteristics. The geometry and thicknesses of the respective layers of the cell allows incident light of various angles to be absorbed by all of the semiconductor layers of the cell.

Photonic bandgap solar cells

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Huntsville, AL, United States of America

Domenico De Ceglia