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Active terahertz metamaterial devices
Hou-Tong Chen1, Willie J Padilla, Joshua M O Zide
1Center for Integrated Nanotechnologies, Materials Physics & Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. chenht@lanl.gov
Nature
|December 1, 2006
Summary
Researchers developed an active metamaterial device for real-time control of terahertz (THz) waves. This breakthrough significantly improves THz wave manipulation, addressing a key challenge in the THz gap.
Area of Science:
- Electromagnetic materials science
- Terahertz (THz) technology
Background:
- Metamaterials enable phenomena not found in natural materials, particularly crucial for the THz frequency range.
- A significant 'THz gap' exists due to limited material response and device components (sources, detectors, modulators) for THz radiation.
- While THz generation and detection have seen progress, THz wave control and manipulation techniques lag behind.
Purpose of the Study:
- To demonstrate an active metamaterial device for efficient, real-time control and manipulation of terahertz (THz) radiation.
- To address the limitations in current THz wave control technologies.
Main Methods:
- Fabrication of an active metamaterial device using an array of gold electric resonator elements on a semiconductor substrate.
- Integration of the metamaterial array and semiconductor substrate to form a functional Schottky diode.
- Utilizing the Schottky diode to actively modulate THz transmission.
Main Results:
- The developed active metamaterial device enables efficient real-time control of THz radiation.
- The device achieves a 50 percent modulation of THz transmission.
- This represents an order of magnitude improvement compared to existing THz manipulation devices.
Conclusions:
- The active metamaterial device effectively bridges the gap in THz wave manipulation techniques.
- This advancement holds significant potential for various applications requiring precise THz control.
- The Schottky diode-based metamaterial offers a promising solution for the 'THz gap'.
