Coupled Tamm Phonon and Plasmon Polaritons for Designer Planar Multiresonance Absorbers

Abstract

Wavelength‐selective absorbers (WS‐absorbers) are of interest for various applications, including chemical sensing and light sources. Lithography‐free fabrication of WS‐absorbers can be realized via Tamm plasmon polaritons (TPPs) supported by distributed Bragg reflectors (DBRs) on plasmonic materials. While multifrequency and nearly arbitrary spectra can be realized with TPPs via inverse design algorithms, demanding and thick DBRs are required for high quality‐factors (Q‐factors) and/or multiband TPP‐absorbers, increasing the cost and reducing fabrication error tolerance. Here, high Q‐factor multiband absorption with limited DBR layers (3 layers) is experimentally demonstrated by Tamm hybrid polaritons (THPs) formed by coupling TPPs and Tamm phonon polaritons when modal frequencies are overlapped. Compared to the TPP component, the Q‐factors of THPs are improved twofold, and the angular broadening is also reduced twofold, facilitating applications where narrow‐band and nondispersive WS‐absorbers are needed. Moreover, an open‐source algorithm is developed to inversely design THP‐absorbers consisting of anisotropic media and exemplify that the modal frequencies can be assigned to desirable positions. Furthermore, it is demonstrated that inversely designed THP‐absorbers can realize same spectral resonances with fewer DBR layers than a TPP‐absorber, thus reducing the fabrication complexity and enabling more cost‐effective, lithography‐free, wafer‐scale WS‐absorberss for applications such as free‐space communications and gas sensing.

Angular‐Dispersive Narrowband Absorption Induced by Quasi‐BIC in SiO2‐Au Metamaterial

“…As the non-radiative loss originates from the intrinsic absorption of materials, such as Ohm loss, lattice vibration absorption, exciton absorption, and so on, to effectively narrow the absorption bandwidth, some optically transparent dielectrics can be used to replace metallic structures (i.e., reducing nonradiative loss). [15] Meanwhile, novel physical mechanisms such as surface lattice resonance (SLR), [16,17] Tamm plasmon resonance, [18,19] guide mode resonance, [20] and bound states in the continuum (BIC) [21,22] are considered to weaken the radiative loss.…”

Tamm phonon-polaritons triggered in hyperbolic material hexagonal boron nitride

“…Besides, Hua et al utilized the distributed Bragg reflector (DBR)/germanium (Ge) cavity/SiC/Ge substrate to excite TPhPs, which can achieve and control perfect infrared frequency absorption [41]. Since TPhPs are first proposed and experimentally observed, this new electromagnetic wave mode has been proposed in many applications [42][43][44][45]. Until now, TPhPs have primarily been explored in SiC with a PC [46][47][48][49].…”