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Lasing in hybrid metal-Bragg nanocavities.
You, Jong-Bum,Kwon, Kyungmook,Lee, Wook-Jae,Shim, Jaeho,Won, Dongshik,Jung, Youngho,Park, Byounghun,Yu, Kyoungsik Optical Society of America 2013 Optics letters Vol.38 No.10
<P>We report room-temperature lasing from an optically pumped subwavelength-scale cylindrical InGaAsP pillar surrounded by circular Bragg reflectors on a metal substrate with a dielectric spacer layer. By taking advantage of wide in-plane photonic bandgaps and proper vertical antiresonances, three dielectric Bragg pairs produce a sufficient optical feedback capable of low threshold lasing from the fundamental TE011 mode. A large spontaneous emission coupling into the lasing mode is obtained from the cavity-enhanced Purcell effects and effective suppression of nonlasing modes.</P>
You, Jong-Bum,Lee, Wook-Jae,Won, Dongshik,Yu, Kyoungsik Optical Society of America 2014 Optics express Vol.22 No.7
<P>The cavity resonant properties of planar metal-dielectric layered structures with optically dense dielectric media are studied with the aim of realizing omnidirectional and polarization-insensitive operation. The angle-dependent coupling between free-space and cavity modes are revealed to be a key leverage factor in realizing nearly perfect absorbers well-matched to a wide range of incidence angles. We establish comprehensive analyses of the relationship between the structural and optical properties by means of theoretical modeling with numerical simulation results. The presented work is expected to provide a simple and cost-effective solution for light absorption and detection applications that exploit planar metal-dielectric optical devices.</P>
A case of linear nevus sebaceous associated with syringocystadenoma papilliferum
( You Bum Song ),( Jun Gyu Song ),( Moo Kyu Suh ),( Jong Im Lee ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.1
Nevus sebaceous is a benign hamartoma with epidermal, follicular, and apocrine elements and has a well-documented neoplastic potential. Several appendageal tumors have been described presenting within a nevus sebaceous. Syringocystadenoma papilliferum (SCAP) is a rare benign adnexal neoplasm that presented hamartomatous malformation of apocrine and eccrine sweat glands, and occur often in conjunction with a nevus sebaceous. The patient was a 31-year-old female who presented with 6.0 x 1.0 cm sized normal skin colored to yellowish linear verrucous plaques, nodule on the left forehead since childhood. Histopathological examination of a skin biopsy specimen from the lesion revealed 2 distinctly different findings. The nodular portion of lesion showed cystic invaginations extending into the dermis, with numerous papillary projections. The plaque portion of lesion showed papillomatosis, acanthosis in the epidermis, and consisted of many mature sebaceous glands, several ectopic apocrine gland in the dermis. We diagnosed this case as linear nevus sebaceous associated with SCAP on the basis of above clinical and histopathological examination. The patient was treated with surgical excision. The recurrence has not been observed during 3 months of follow up.
A case of linear IgA bullous dermatosis
( You Bum Song ),( Ji Young Yoo ),( Moo Kyu Suh ),( Jong Im Lee ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.1
Linear immunoglobulin A (IgA) bullous dermatosis is a rare vesiculobullous eruption that has an pattern of homogeneous linear IgA deposits at the epidermal basement membrane. Clinical presentations may heterogeneous and often indistinguishable from dermatitisherpetiformis and bullous pemphigoid. It is characterized by combinations of symmetrically presenting papules, bullae and vesicles on the extensor surfaces, including elbows, knees, and buttocks. The patient was a 15-year-old boy who presented with bullous eruptions on the whole face, chest, trunk, back, both arm and hand dorsum for 3 months. Other bullous eruption and mucosal involvement were not observed. Histopathological examination of a skin biopsy specimen from the lesion revealed subepidermal blister and infiltration of neutrophils and lymphocytes in the upper dermis. Direct immunofluorescence revealed linear deposits of IgA and C3 at the basement membrane zone. We diagnosed this case as linear IgA bullous dermatosis on the basis of above clinical and histopathological examination. The patient was treated with dapsone(100mg/day) and topical tarcrolimus. The lesions improved within 1 week and no bullous eruption was observed during 3 months of follow up
Nipple eczema in 15-year-old boy with atopic dermatitis
( You Bum Song ),( Ji Young Yoo ),( Moo Kyu Suh ),( Jae Hong Kim ),( Jong Im Lee ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.1
Atopic dermatitis (AD) is a chronically relapsing skin disorder which is most common in childhiood. The common manifestations of AD is vary according to patient’s age and disease activity. The nipple involvement in AD is rare, but Hanifin and Raika indicated that it is specific indicator of AD. And nipple eczema predominated in girl. Nipple eczema in male with AD has been reported only 3 cases by Korean dermatological literature. We report a case of nipple eczema in 15-year-old boy with AD. He presented with localized pruritic lichenified eythematous patches with exudative erosions on the both nipples and areolas. He was diagnosed with AD at age of 4, but there are no other lesions or signs of scratching. Histopathologic examination revealed marked acanthosis with patial erosion, spongiosis, exocytosis of small lymphocytes and some eosinophils, and infiltrate of small lymphocytes and some eosinophils around dilated dermal vessels. The patient was treated with antihistamine and steroid. The skin lesions improved 1 months after treatment, and relapse has not been observed 3 months of follow up.