Optical design of nanowire absorbers for wavelength selective photodetectors

We propose the optical design for the absorptive element of photodetectors to achieve wavelength selective photo response based on resonant guided modes supported in semiconductor nanowires. We show that the waveguiding properties of nanowires result in very high absorption efficiency that can be exploited to reduce the volume of active semiconductor compared to planar photodetectors, without compromising the photocurrent. We present a design based on a group of nanowires with varying diameter for multi-color photodetectors with small footprint. We discuss the effect of a dielectric shell around the nanowires on the absorption efficiency and present a simple approach to optimize the nanowire diameter-dielectric shell thickness for maximizing the absorption efficiency.

[1]  Zongfu Yu,et al.  Detailed balance analysis and enhancement of open-circuit voltage in single-nanowire solar cells. , 2014, Nano letters.

[2]  Chennupati Jagadish,et al.  Ultralow surface recombination velocity in InP nanowires probed by terahertz spectroscopy. , 2012, Nano letters.

[3]  P. Krogstrup,et al.  Single-nanowire solar cells beyond the Shockley-Queisser limit , 2013, 1301.1068.

[4]  D. J. Hill,et al.  Doubling absorption in nanowire solar cells with dielectric shell optical antennas. , 2015, Nano letters.

[5]  Yongtao Li,et al.  High-Performance Few-layer Mo-doped ReSe2 Nanosheet Photodetectors , 2014, Scientific Reports.

[6]  Paul W. Leu,et al.  Tunable and selective resonant absorption in vertical nanowires. , 2012, Optics letters.

[7]  Paul Steinvurzel,et al.  Multicolored vertical silicon nanowires. , 2011, Nano letters.

[8]  J. Rivas,et al.  Nanowire antenna absorption probed with time-reversed fourier microscopy. , 2014, Nano letters.

[9]  J. Gómez Rivas,et al.  Nanowire antenna emission. , 2012, Nano letters.

[10]  Yan Li,et al.  High performance few-layer GaS photodetector and its unique photo-response in different gas environments. , 2014, Nanoscale.

[11]  Hongqi Xu,et al.  Efficient light management in vertical nanowire arrays for photovoltaics. , 2013, Optics express.

[12]  Linyou Cao,et al.  Engineering light absorption in semiconductor nanowire devices. , 2009, Nature materials.

[13]  S. Mokkapati,et al.  Semiconductor Nanolasers , 2012, IEEE Photonics Journal.

[14]  Shanhui Fan,et al.  Light management for photovoltaics using high-index nanostructures. , 2014, Nature materials.

[15]  C. Z. Ning,et al.  Semiconductor nanolasers , 2010 .

[16]  J. Rivas,et al.  Enhanced and directional emission of semiconductor nanowires tailored through leaky/guided modes. , 2013, Nanoscale.

[17]  Leaky mode engineering: A general design principle for dielectric optical antenna solar absorbers , 2013, 1305.5969.