Metamaterial Perfect Absorber Analyzed by a Meta-cavity Model Consisting of Multilayer Metasurfaces

Bhattarai, Khagendra; Silva, Sinhara; Song, Kun; Urbas, Augustine; Lee, Sang Jun; Ku, Zahyun; Zhou, Jiangfeng

doi:10.1038/s41598-017-10520-w

Cited by 70 publications

(34 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The red dashed line in Figure a corresponds with the red transmittance and absorptance curves in Figure b, which demonstrates near‐unity absorptance at an AR = 0.41 (dimensions d = 2.9 µm, h = 1.2 µm, and period p = 5.835 µm) and a free‐space wavelength of 13.1 µm. One advantage of using this architecture for thermal emission is the transmittance remains high outside the absorption band, which is in contrast with past demonstrations of metamaterial perfect absorbers that utilize reflective backplanes causing strong reflection outside of the absorption band …”

Section: Resultsmentioning

confidence: 84%

Near‐Unity and Narrowband Thermal Emissivity in Balanced Dielectric Metasurfaces

Howes

Nolen

Caldwell

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

Nanostructured materials have provided new freedoms for tailoring thermal emissivity in an ultracompact footprint. However, while many designs have demonstrated large absorption amplitude, this often comes at the expense of angular dispersion or the need for a reflective backplane. Furthermore, metal‐based designs generally have broad linewidths due to large nonradiative damping. Here, a unique approach is outlined for obtaining narrowband near‐unity thermal emissivity through spectrally overlapping two orthogonal lossy Mie‐type modes in dielectric metasurfaces operating in the long‐wave infrared. Operating near the transverse optic phonon frequency of a polar dielectric provides a suitably lossy environment, but also one featuring extremely large permittivity, enabling deeply subwavelength resonator sizes, insensitivity to the angle of incidence, and large quality factors even while operating in the long‐wave infrared. Balancing the oscillator strengths and optical losses of the two overlapped resonances maximizes the absorption, resulting in a 3C‐SiC metasurface with 78% absorptance and a quality factor of 170. This balanced metasurface possesses a quality factor on par with some of the narrowest band thermal emitters in the long‐wave infrared, while possessing a simple architecture and prospects for unity emissivity.

show abstract

Section: Resultsmentioning

confidence: 84%

Near‐Unity and Narrowband Thermal Emissivity in Balanced Dielectric Metasurfaces

Howes

Nolen

Caldwell

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…A multiple-layer model [ 45 , 46 , 47 ] was employed to efficiently design the double-layer grating structure and to better understand the underlying mechanism of wave propagation inside the spacer layer bounded by two identical gold (Au) grating layers as illustrated in Figure 1 a. The overall reflection and transmission coefficients of the double-layer grating can be obtained by a transfer matrix model, which depends on the transmission and reflection of each grating layer.…”

Section: Design Of Double-layer Grating Using a Multiple-layer Modmentioning

confidence: 99%

Polarization-Sensitive and Wide Incidence Angle-Insensitive Fabry–Perot Optical Cavity Bounded by Two Metal Grating Layers

Hwang

Jeon

et al. 2020

Sensors

Self Cite

View full text Add to dashboard Cite

Infrared (IR) polarimetric imaging has attracted attention as a promising technology in many fields. Generally, superpixels consisting of linear polarizer elements at different angles plus IR imaging array are used to obtain the polarized target signature by using the detected polarization-sensitive intensities. However, the spatial arrangement of superpixels across the imaging array may lead to an incorrect polarimetric signature of a target, due to the range of angles from which the incident radiation can be collected by the detector. In this article, we demonstrate the effect of the incident angle on the polarization performance of an alternative structure where a dielectric layer is inserted between the nanoimprinted subwavelength grating layers. The well-designed spacer creates the Fabry–Perot cavity resonance, and thereby, the intensity of transverse-magnetic I-polarized light transmitted through two metal grating layers is increased as compared with a single-layer metal grating, whereas transverse-electric (TE)-transmitted light intensity is decreased. TM-transmittance and polarization extinction ratio (PER) of normally incident light of wavelength 4.5 μm are obtained with 0.49 and 132, respectively, as the performance of the stacked subwavelength gratings. The relative change of the PERs for nanoimprint-lithographically fabricated double-layer grating samples that are less than 6% at an angle of incidence up to 25°, as compared to the normal incidence. Our work can pave the way for practical and efficient polarization-sensitive elements, which are useful for many IR polarimetric imaging applications.

show abstract

“…In this work, we focus on a different application, that of perfect absorption. Recentlyproposed metamaterial-based perfect absorbers require elaborate designs with precisely structured metal inclusions and/or multilayer topologies [19][20][21][22][23][24][25]. Achieving efficient operation with simpler structures that do not involve elaborate fabrication techniques is thus of high importance, as highlighted in [26].…”

Section: Introductionmentioning

confidence: 99%

Perfect optical absorption with nanostructured metal films: design and experimental demonstration

Perrakis¹,

Tsilipakos²,

Kenanakis³

et al. 2019

Opt. Express

View full text Add to dashboard Cite

Structuring metal surfaces on the nanoscale has been shown to alter their fundamental processes like reflection or absorption by supporting surface plasmon resonances. Here, we propose metal films with subwavelength rectangular nanostructuring that perfectly absorb the incident radiation in the optical regime. The structures are fabricated with low-cost nanoimprint lithography and thus constitute an appealing alternative to elaborate absorber designs with complex meta-atoms or multilayer structuring. We conduct a thorough numerical analysis to gain physical insight on how the key structural parameters affect the optical response and identify the designs leading to broad spectral and angular bandwidths, both of which are highly desirable in practical absorber applications. Subsequently, we fabricate and measure the structures with an FT-IR spectrometer demonstrating very good agreement with theory. Finally, we assess the performance of the proposed structures as sensing devices by quantifying the dependence of the absorption peak frequency position on the superstrate material.

show abstract

Metamaterial Perfect Absorber Analyzed by a Meta-cavity Model Consisting of Multilayer Metasurfaces

Cited by 70 publications

References 38 publications

Near‐Unity and Narrowband Thermal Emissivity in Balanced Dielectric Metasurfaces

Near‐Unity and Narrowband Thermal Emissivity in Balanced Dielectric Metasurfaces

Polarization-Sensitive and Wide Incidence Angle-Insensitive Fabry–Perot Optical Cavity Bounded by Two Metal Grating Layers

Perfect optical absorption with nanostructured metal films: design and experimental demonstration

Contact Info

Product

Resources

About