Flexible and Ultranarrow Transmissive Color Filters by Simultaneous Excitations of Triple Resonant Eigenmodes in Hybrid Metallic–Optical Tamm State Devices

Abstract

We demonstrate a flexible transmissive color filter based on a hybrid metallic–optical Tamm state device composed of a thin metallic film on top of dual dielectric distributed Bragg reflectors (DBRs) to simultaneously excite the Tamm plasmon (TP), the optical Tamm state (OTS), and the Fabry–Pérot (FP) resonant eigenmodes for spectrally achieving triple transmittance peaks in the visible light range. We show that the resonant eigenmodes confined inside the device can be tuned at will by simply adjusting the designed Bragg wavelengths of the dual DBRs and retain an ultranarrow bandwidth regardless of resonant wavelength, creating the desired chromaticity points and constructing a large color gamut space in the CIE coordinate. We further show that, due to the fabrication simplicity of our color filter involving only thin-film deposition, the proposed structure can be easily integrated onto flexible substrates, leading to tunable transmittance spectrum as well as the color appearance by simply changing its bending curvature. The tunable color filter reported herein can be employed for various applications such as aesthetical color decorations in architectures, low-cost and portable spectral analyzers, and optical strain/deformation sensors.

Achieving High Transmission and Q Bragg Filter via Balancing Dissipation and Radiation Loss

“…Also, the average T exceeds 90%. In contrast to other kinds of filters, the FWHM and T of our structures are almost unchanged with resonance frequencies because of the relatively fixed radiation loss and dissipation loss of structures [19], [25]. Thanks to the features of the structure and the material, we can independently adjust the dissipation loss and radiation loss rate of the resonator precisely to achieve required Q and T of applications by changing the coating process parameters and the number of stacks.…”

“…[17], [18]. Numerous optical systems based on DBR have been widely applied for color filters, lasers, photodetectors, bio-sensors and thermal radiators [19]- [21].…”

Photonic and Plasmonic Metasensors

“…Confinement of the electromagnetic fields in such configurations is related to the negative dielectric constant of metallic layers and the photonic stop band of the Bragg mirror. Possessing a zero in-plane wavevector, polarization independency, and broadband tunability of the excited modes through varying the stop band of the distributed Bragg mirror, researchers exploited this technology for the development of a wide range of devices, [307] such as wavelength-selective thermal emitters, [308,309] refractive index sensors, [310] light sensing, [311,312] narrow-band color filters, [313] single-photon emission and enhancement of spontaneous emission. [314,315] Famous for having ultranarrow lineshapes, high-Q Tamm states have recently received growing attention to build sensi-tive biosensing tools.…”

Recent Advances in Solution‐Processable Organic Photodetectors and Applications in Flexible Electronics

“…The development of flexible optical filters remains a challenge. [50][51][52] The filter-free spectral selective OPD techniques are desired. Filter-free OPDs have been demonstrated via novel device designs and the dynamics of the photogenerated charge carriers.…”