研究目的
Investigating the plasmonic photo-thermoelectric conversion as an alternative photodetection mechanism not restricted by semiconductor bandgaps.
研究成果
The study demonstrated a plasmonic photodetector based on thermoelectric conversion triggered by plasmonic local heating. The wavelength dependence of EQE values was consistent with the extinction spectrum of the Ag nanohole, indicating that surface plasmon polaritons at the nanoholes played a dominant role in this photodetection mechanism. The simple device configuration consisting of a single Ag nano-film should help to ignite interest in the development of photodetectors that operate effectively on the nanoscale.
研究不足
The external quantum efficiency and responsivity of the nanohole-array Ag thin-film device are significantly lower than those of commercial Si detectors. There is scope for increasing EQE values via optimization of device configurations, nanohole morphology, and appropriate material selection.
1：Experimental Design and Method Selection:
The study involved the fabrication of a plasmonic photodetector consisting of an ultra-thin silver film with a nanohole array pattern. The photodetection mechanism was based on thermoelectric conversion triggered by plasmonic local heating.
2：Sample Selection and Data Sources:
A positive resist film was prepared on a glass substrate by spin-coating, and a pattern of nanoholes was fabricated by electron beam lithography.
3：List of Experimental Equipment and Materials:
Equipment included a field-emission scanning electron microscopy (FE-SEM), a microscopic spectrometer, a diode laser, and a digital multimeter. Materials included a silver thin film and a positive resist film.
4：Experimental Procedures and Operational Workflow:
The Ag thin film was deposited on the resist film by thermal evaporation. The photocurrent generated in the Ag thin film was measured under illumination.
5：Data Analysis Methods:
The external quantum efficiency (EQE) was calculated by dividing the number of detected electrons by the number of incident photons. Thermoelectric simulations were conducted using COMSOL Multiphysics.
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