Pis’ma v ZhETF, vol. 114, iss. 7, pp. 435 - 436

Plasmonic metasurface filter with full color sensitivity and narrow

band-pass in visible region

R. Zhang^+∗1), X. Guo^+∗, H. Qiu^+∗, X. Liu^+∗, M. Han^+∗, T. Jia^+∗, H. Cheng^+∗1)

⁺Science and Technology on Low-Light-Level Night Vision Laboratory, Electronic Fourth Road, Yanta District, 710065 Xi’an, China

^∗Kunming Institute of Physics, Jiaochang East Road, 650221 Kunming, China

Submitted 14 August 2021

Resubmitted 27 August 2021

Accepted 1 September 2021

DOI: 10.31857/S1234567821190010

Recently, metasurfaces have attracted extensive in-

In this work, we design and demonstrate a meta-

terests in imaging with desirable wavelength, realizing

surface filter as shown in Fig. 1a, where the metasurface

full or multicolor holograms [1, 2], printing [3], and im-

consists of a metal layer and a SiO₂ substrate layer with

age sensor [4] applications. Among these applications,

thicknesses of t_m = 10 nm and t_s = 100 nm, respectively.

discrete wavelength selection from white light plays a

Inspired by the typical SRR structure, the metal layer

key role in optical information recording and imaging

is designed as complementary SRR dimer arrays, which

processes. Plasmonic metasurface filters provide rich

are etched on the aluminum layer. Compared with gold

platforms for readily realizing desirable wavelength se-

and silver, aluminum is low cost and abundant, which is

lection due to color tunability, reliability, and multi-

a kind of high-quality plasmonic material with plasmon

functionality. The advantages of metasurface filters be-

tunability ranging from UV to visible light [6].

yond traditional filters are ascribed to three aspects.

Since the resonant wavelengths of metasurfaces de-

First, plasmonic color filters are based on the resonant

pend on the design of unit cell, we select the resonant

interaction between incident electromagnetic field and

wavelengths of the metasurfaces by scaling the peri-

the micro/nanoscale structures, which selects required

odic parameters, SRR length and the gap distance. Po-

wavelength via optimal design of optical elements in-

larization properties of micro/nanostructured metasur-

cluding size, shape, thickness, chosen materials, and pe-

faces are important for practical photonic devices [7].

riodicity of unit cell arrays. Second, plasmonic meta-

Herein, for the visible light with linearly polarized along

surface filters are stable and insensitive to the ambi-

x-axis (E_in,x), transmission peaks of the metasurface

ent environment including humidity, high temperature,

filter present at 543, 595, 646, 694, 741, and 787 nm

and even ultraviolet (UV) radiation, which is superior to

with increasing the geometric parameters, realizing vis-

some organic filters. Third, plasmonic metasurfaces can

ible color filters ranging from green light to red light,

be employed as on-chip filter to directly integrate with

as shown in Fig.1b. The transmission maxima of the

a complementary metal oxide semiconductor (CMOS)

metasurface filter are constant as ∼ 47 % and the line-

image sensor [4, 5], promoting the development of ad-

widths (full width at half maximum) are ∼ 32 nm for

vanced image sensor technology.

these specifications. As for the visible light with linearly

Currently, plasmonic-metasurface-based filtering

polarized along y-axis (E_in,y) transmission peaks of the

ranging from UV to terahertz region have been in-

metasurface filter present at 417, 458, 494, and 527 nm

vestigated with proper design of unit cells and their

with increasing the geometric parameters, realizing vis-

arrangements. However, for most-investigated visible

ible color filters ranging from violet light to green light,

color filters, filtering with only primary color, weak

as shown in Fig.1b. The transmission maxima of the

transmission, and unsatisfied band width remains a

metasurface filter are constant as ∼ 41 % and the line-

bottleneck, which may limit the performance of com-

widths are ultranarrow as

16 nm for these specifica-

plex full-color imaging. How to realize full-color filter

tions.

with high-quality is a main issue for the investigation

Transmission spectra are closely related to the plas-

of plasmonic filters.

monic resonances. Based on the plasmonic mode anal-

ysis of E_in,x and E_in,y, plane waves, we can make some

conclusions as follows: (1) basic magnetic dipoles are

¹⁾zhangruoyu19920220@gmail.com; chh600@163.com

induced in the metasurface filter when transmit E_in,x

Письма в ЖЭТФ том 114 вып. 7 - 8

2021

435

436

R. Zhang, X. Guo, H. Qiu et al.

Fig. 1. (Color online) (a) - Schematic illustration of the metasurface filter under linearly polarized white light illumination.

(b) - Transmission spectra of the plasmonic metasurface filters with different periodic parameters for linearly polarized visible

light along x-axis (543 ∼ 787 m) and y-axis (417 ∼ 527 nm)

plane wave, while electric dipoles are generated for E_in,y

This is an excerpt of the article

“Plasmonic

plane wave; (2) plasmonic modes are basically iden-

metasuface filter with full color sensitivity and

tical as increasing periodic parameters at their reso-

narrow band-pass in visible region”. Full text of

nant wavelengths for both E_in,x and E_in, y plane waves;

the paper is published in JETP Letters journal.

(3) magnetic or electric field can be generated in the

DOI: 10.1134/S0021364021190024

gap region with proper gap distance between SRRs,

which originates from mutual interaction between the

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4. S. Yokogawa, S. P. Burgos, and H. A. Atwater, Nano

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2021