Research

We are broadly interested in multi-functional photonics itself and optoelectronic devices using them as follows:

  1. Multi-functional photonic structures

  2. Photonics/devices for energy-saving

  3. Bio-inspired photonics/imaging

  4. Optoelectronics for bio-medical applications

1. Multi-functional photonic structures

2. Photonics/devices for energy-saving

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Sun (~6000 K) and Universe (~3 K) are versatile heat source and sink for Earth. Using them, we implement energy/heat harvester and cold harvester. Useful handling two heat source and sink requires multi-functional photonic structures. By combining the above-mentioned photonic structure with thermal and electrical analyses, our lab is studying radiative cooling, solar photovoltaics, and the integrated system with them.

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Light-matter interaction at nano-/micro-scales has provided multi-functionality such as transparent electrode, colorimetric sensors, near-unity absorption/reflection, ultra-thin lens, and so forth. We understand the working principles through analytical and numerical analyses (e.g., FDTD and RCWA) and further develop the photonic materials with various applicability.

Related publications (Five articles) *equally contributed

 

1. J. H. Lee et al., “Colored, covert infrared display through hybrid planar-plasmonic cavities”, Adv. Opt. Mater. 2100429 (2021). (JCR 7%)

2. G. J. Lee et al., “Spectrally and spatially selective emitters using polymer hybrid spoof plasmonics”, ACS Appl. Mater. Interfaces 12, 53206-53214 (2020).

3. G. J. Lee et al., “Selective and sensitive photon sieve based on III-V semiconductor nanowire forest fabricated by lithography-free process”, Adv. Opt. Mater. 8, 17 (2020). (JCR 7%)

4. G. J. Lee et al. “The Facile Implementation of Soft/Tunable Multiband Optical Filters by Stacking Vertical Silicon Nanowire Arrays for Smart Sensing”, Adv. Intell. Syst. 1900072 (2019).

5. H. S. Song*, G. J. Lee* et al., “Reflective color filter with precise control of the color coordinate achieved by stacking silicon nanowire arrays onto ultrathin optical coatings”, Sci. Reports 9, 3350 (2019).

Related publications (Five articles) *equally contributed

 

1. S.-Y. Heo*, G. J. Lee* et al., “A Janus emitter for passive heat release from enclosures”, Sci. Adv. 6, 36, eabb1906 (2020). (JCR 7%)

2. M. H. Kang*, G. J. Lee* et al., “Outdoor-useable, Wireless/Battery-free Patch-type Tissue Oximeter with Nano-/Micro-voids Polymer”, Adv. Sci. 2004885 (2021). (JCR 6%)

3. G. J. Lee et al., “Colored, Daytime Radiative Coolers with Thin-Film Resonators for Aesthetic Purposes”, Adv. Opt. Mater. 1800707 (2018). (JCR 7%)

4. D. H. Kim*, G. J. Lee* et al., “Thermostat property of Janus emitter in enclosures”, Sol. Energy Mater. Sol. Cells, 230, 111173 (2021).

5. D. H. Kim*, G. J. Lee* et al., “Ultra-thin and near-unity selective emitter for efficient cooling”, Opt. Express 20, 27 (2021). 

3. Bio-inspired photonics/imaging

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Biological eyes have inspired next-generation imaging systems for simple, compact, and miniaturized imaging device. In addition to hardware compactness, various biological eyes have functionalities such as scotopic vision, foveated imaging, amphibious imaging, asymmetric depth of field, and so forth. Our lab is finding new classes of eyes in nature and attempting to engineer the natural eyes using ray-tracing method for advanced imaging systems.

Related publications (Five articles) *equally contributed

 

1. M. S. Kim*, G. J. Lee* et al., “An aquatic-vision-inspired camera using a monocentric lens and a silicon nanorod photodiode array”, Nat. Electronics 3, 546-553 (2020). (JCR 1%)

2. G. J. Lee et al., “Bioinspired Artificial Eyes: Optic Components, Digital Cameras, and Visual Prostheses”, Adv. Funct. Mater. 2018, 1705202 (2018). (JCR 5%)

3. C. Choi et al., “Human eye-inspired soft optoelectronic device using high-density MoS2-graphene curved image sensor array”, Nat. Commun. 8, 15894 (2017). (JCR 10%)

4. C. Choi et al., “Curved neuromorphic image sensor array using a MoS2-organic heterostructure inspired by the human visual recognition system”, Nat. Commun. 11, 5934 (2020). (JCR 10%)

5. G. J. Lee et al., “Robustness of an artificially tailored fisheye imaging system with a curvilinear image surface”, Opt. Laser Technol. 96, 50 (2017).

4. Optoelectronics for bio-medical applications

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Light can deal with from serious diseases to healthcare monitoring by penetrating the skin or tissue layers. A penetration depth of light is seriously restricted due to scattering and absorption of tissues. We are developing the efficient light delivery configuration using Monte-Carlo and FDTD methods. Another issue in wearables, heat management, is also studied by combining radiative cooling.

Related publications (Five articles) *equally contributed

 

1. Y. Lee*, T. Kang*, H. R. Cho*, G. J. Lee* et al., “Localized delivery of theranostic nanoparticles and high-energy photons using microneedles-on-bioelectronics”, Adv. Mater. 2100425 (2021). (JCR 3%)

2. M. H. Kang*, G. J. Lee* et al., “Outdoor-useable, Wireless/Battery-free Patch-type Tissue Oximeter with Nano-/Micro-voids Polymer”, Adv. Sci. 2004885 (2021). (JCR 6%)

3. J.-K. Song et al., “Wearable Force Touch Sensor Array Using a Flexible and Transparent Electrode”, Adv. Func. Mater. 27, 6, 1605286 (2017). (JCR 3%)

4. M. H. Kang*, G. J. Lee* et al., “NFC-based Wearable Optoelectronics Working with Smartphone Application for Untact Healthcare”, Sensors, 21, 878 (2021).

5. M. S. Kim*, G. J. Lee* et al., “Parametric Optimization of Lateral NIPIN Phototransistors for Flexible Image sensors”, Sensors 17, 1774 (2017).